breqn (6aug14)

git-svn-id: svn://tug.org/texlive/trunk@34867 c570f23f-e606-0410-a88d-b1316a301751

3 files changed, 2655 insertions, 0 deletions

diff --git a/Master/texmf-dist/tex/latex/breqn/breqn.sty b/Master/texmf-dist/tex/latex/breqn/breqn.sty
new file mode 100644
index 00000000000..0ea7e1d2c1b
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/breqn/breqn.sty
@@ -0,0 +1,2040 @@
+%%
+%% This is file `breqn.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% breqn.dtx  (with options: `package')
+%% 
+%% This is a generated file.
+%% 
+%% Copyright (C) 1997-2003 by Michael J. Downes
+%% Copyright (C) 2007-2008 by Morten Hoegholm
+%% Copyright (C) 2007-2014 by Lars Madsen
+%% Copyright (C) 2007-2014 by Will Robertson
+%% 
+%% This work may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either
+%% version 1.3 of this license or (at your option) any later
+%% version. The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of
+%% LaTeX version 2005/12/01 or later.
+%% 
+%% This work has the LPPL maintenance status "maintained".
+%% 
+%% The Current Maintainer of this work is Will Robertson.
+%% 
+%% This work consists of the main source file breqn.dtx
+%% and the derived files
+%%    breqn.sty, breqn.pdf, breqn.ins.
+%% 
+\NeedsTeXFormat{LaTeX2e}
+\RequirePackage{expl3}[2009/08/05]
+\ProvidesExplPackage{breqn}{2012/05/10}{0.98b}{Breaking equations}
+\ExplSyntaxOff
+\edef\breqnpopcats{%
+  \catcode\number`\"=\number\catcode`\"
+  \relax}
+\AtEndOfPackage{\breqnpopcats}%
+\catcode`\^=7 \catcode`\_=8 \catcode`\"=12 \relax
+\DeclareOption{mathstyleoff}{%
+  \PassOptionsToPackage{mathstyleoff}{flexisym}%
+}
+\ProcessOptions\relax
+\@ifpackageloaded{flexisym}{}{%
+  \RequirePackage{flexisym}[2009/08/07]
+    \edef\breqnpopcats{\breqnpopcats
+    \catcode\number`\^=\number\catcode`\^
+    \catcode\number`\_=\number\catcode`\_
+  }%
+  \catcode`\^=7 \catcode`\_=8 \catcode`\"=12 \relax
+}
+\RequirePackage{keyval,calc}\relax
+\@ifundefined{options}{%
+\newcommand{\options}[2]{%
+  \expandafter\options@a\csname opt@#1.sty\endcsname{#2}%
+  \setkeys{#1}{#2}%
+}
+\def\options@a#1#2{%
+  \edef\@tempa{\options@b#2,\@empty\@nil}%
+  \ifx#1\relax \let#1\@empty\fi
+  \xdef#1{#1\ifx#1\@empty\@xp\@gobble\@tempa\@empty\else\@tempa \fi}%
+}
+\def\options@b#1,#2#3\@nil{%
+  \options@c#1 \@nil
+  \ifx#2\@empty \else\options@b#2#3\@nil\fi
+}
+\def\options@c#1 #2\@nil{\options@d#1=\@nil}
+\def\options@d#1=#2\@nil{\ifx\@empty #1\@empty\else,\fi#1}
+}{}% end @ifundefined test
+\let\@nx\noexpand
+\let\@xp\expandafter
+\@ifundefined{@emptytoks}{\newtoks\@emptytoks}{}
+\chardef\f@ur=4
+\newcount\inf@bad \inf@bad=1000000
+\newcount\maxint \maxint=2147483647
+\let\int@a=\@tempcnta
+\let\int@b=\@tempcntb
+\let\int@c=\count@
+\let\dim@a\@tempdima
+\let\dim@b\@tempdimb
+\let\dim@c\@tempdimc
+\let\dim@d\dimen@
+\let\dim@e\dimen@ii
+\let\dim@A\dimen@i
+\let\skip@a\@tempskipa
+\let\skip@b\@tempskipb
+\let\skip@c\skip@
+\let\toks@a\@temptokena
+\let\toks@b\toks@
+\toksdef\toks@c=2
+\toksdef\toks@d=4
+\toksdef\toks@e=6
+\toksdef\toks@f=8
+\def\abs@num#1{\ifnum#1<\z@-\fi#1}
+\def\@ifnext#1#2#3{%
+  \let\@tempd= #1\def\@tempa{#2}\def\@tempb{#3}%
+  \futurelet\@tempc\@ifnexta
+}
+\def\@ifnexta{\ifx\@tempc\@tempd \let\@tempb\@tempa \fi \@tempb}
+\def\@ifstar#1#2{%
+  \let\@tempd*\def\@tempa*{#1}\def\@tempb{#2}%
+  \futurelet\@tempc\@ifnexta
+}
+\def\@optarg#1#2{\@ifnext[{#1}{#1[#2]}}
+\def\@True{00}
+\def\@False{01}
+\def\@Not#1{0\ifcase#11 \or\@xp 1\else \@xp 0\fi}
+\def\@And#1#2{0\ifcase#1#2 \@xp 0\else \@xp 1\fi}
+\def\@Or#1#2{0\ifnum#1#2<101 \@xp 0\else \@xp 1\fi}
+\def\theb@@le#1{\if#1 True\else False\fi}
+\def\freeze@glue#1{#11#1\relax}
+\def\z@rule{\vrule\@width\z@}% no \relax ! use with care
+\def\keep@glue{\z@rule\relax}
+\begingroup \catcode`\&=11
+\gdef\replicate#1{%
+  \csname &\expandafter\replicate@a\romannumeral\number\number#1 000q\endcsname
+}
+\endgroup
+\long\def\replicate@a#1#2\endcsname#3{#1\endcsname{#3}#2}
+\begingroup \catcode`\&=11
+\long\gdef\&m#1#2{#1\csname &#2\endcsname{#1}}
+\endgroup
+\@xp\let\csname\string &q\endcsname\@gobble
+\ExplSyntaxOn
+\g@addto@macro\mathchars@reset{%
+  %\let\@symRel\@secondoftwo \let\@symBin\@secondoftwo
+  %\let\@symDeL\@secondoftwo \let\@symDeR\@secondoftwo
+  %\let\@symDeB\@secondoftwo
+  \cs_set_eq:NN \math_csym_Rel:Nn \use_ii:nn
+  \cs_set_eq:NN \math_csym_Bin:Nn \use_ii:nn
+  \cs_set_eq:NN \math_csym_DeL:Nn \use_ii:nn
+  \cs_set_eq:NN \math_csym_DeR:Nn \use_ii:nn
+  \cs_set_eq:NN \math_csym_DeB:Nn \use_ii:nn
+}
+\ExplSyntaxOff
+\def\eq@cons#1#2{%
+  \begingroup \let\@elt\relax \xdef#1{\@elt{#2}#1}\endgroup
+}
+\providecommand{\@saveprimitive}[2]{%
+  \begingroup
+  \edef\@tempa{\string#1}\edef\@tempb{\meaning#1}%
+  \ifx\@tempa\@tempb \global\let#2#1%
+  \else
+    \edef\@tempb{\meaning#2}%
+    \ifx\@tempa\@tempb
+    \else \@saveprimitive@a#1#2%
+    \fi
+  \fi
+  \endgroup
+}
+\providecommand\@saveprimitive@a[2]{%
+  \begingroup
+  \def\@tempb##1#1##2{\edef\@tempb{##2}\@car{}}%
+  \@tempb\nullfont{select font nullfont}%
+    \topmark{\string\topmark:}%
+    \firstmark{\string\firstmark:}%
+    \botmark{\string\botmark:}%
+    \splitfirstmark{\string\splitfirstmark:}%
+    \splitbotmark{\string\splitbotmark:}%
+    #1{\string#1}%
+    \@nil % for the \@car
+  \edef\@tempa{\expandafter\strip@prefix\meaning\@tempb}%
+  \edef\@tempb{\meaning#1}%
+  \ifx\@tempa\@tempb \global\let#2#1%
+  \else
+    \PackageError{breqn}%
+      {Unable to properly define \string#2; primitive
+      \noexpand#1no longer primitive}\@eha
+    \fi
+  \fi
+  \endgroup
+}
+\begingroup \catcode`\$=\thr@@ % just to make sure
+  \global\let\@@math=$ \gdef\@@display{$$}% $$$
+\endgroup
+\let\@@endmath=\@@math
+\let\@@enddisplay=\@@display
+\@saveprimitive\vadjust\@@vadjust
+\@saveprimitive\insert\@@insert
+\@saveprimitive\mark\@@mark
+\@ifundefined{listwidth}{\newdimen\listwidth}{}
+\listwidth=\z@
+\def\eqfontsize{}         % Inherit from context    [NOT USED?]
+\def\eqcolor{black}       % Default to black        [NOT USED?]
+\newdimen\eqnumsep \eqnumsep=10pt        % Min space between equ number and body
+\newdimen\eqmargin \eqmargin=8pt         % For `multline' gap emulation
+\def\eqindent{C}%         % C or I, centered or indented
+\def\eqnumside{R}%        % R or L, right or left
+\def\eqnumplace{M}%       % M or T or B, middle top or bottom
+\def\eqnumfont{}%         % Null for easier debugging [mjd,1997/09/26]
+\def\eqnumform#1{(#1\@@italiccorr)} % Add parens
+\def\eqnumsize{}          % Allow numbers to have different typesize ...
+\def\eqnumcolor{}         % ... or color than eq body e.g. \color{blue}
+\newlength\eqlinespacing \eqlinespacing=14pt plus2pt % Base-to-base space between lines
+\newlength\eqlineskip \eqlineskip=3pt plus2pt % Min space if eqlinespacing too small
+\newdimen\eqlineskiplimit \eqlineskiplimit=2pt  % Threshold for switching to eqlineskip
+\newmuskip \eqbinoffset \eqbinoffset=15mu minus-3mu % Offset from mathrel alignment pt for mathbins
+\newmuskip\eqdelimoffset \eqdelimoffset=2mu    % Additional offset for break inside delims
+\newdimen\eqindentstep \eqindentstep=8pt     % Indent used when LHS wd is n/a or too large
+\newtoks\eqstyle           % Customization hook
+\newcount\eqbreakdepth \eqbreakdepth=2       % Allow breaks within delimiters to this depth
+\newcount \eqinterlinepenalty \eqinterlinepenalty=10000 % No page breaks between equation lines
+\newcount \intereqpenalty \intereqpenalty=1000   % Pagebreak penalty between equations [BRM: Was \@M]
+\newlength \intereqskip \intereqskip=3pt plus2pt % Additional vert space between equations
+\newcount\prerelpenalty \prerelpenalty=-\@M   % Linebreak penalty before mathrel symbols
+\newcount\prebinoppenalty \prebinoppenalty=888  % Linebreak penalty before mathbins
+\newmuskip \Dmedmuskip \Dmedmuskip=4mu minus 3mu % medmuskip in displays
+\newmuskip \Dthickmuskip \Dthickmuskip=5mu minus 2mu % thickmuskip in displays
+\def\eq@number{}          % Internal variable
+\newlength\eqleftskip \eqleftskip=\@centering  % Space on the left  [NOT USED?]
+\newlength\eqrightskip \eqrightskip=\@centering % Space on the right [NOT USED?]
+\newlength\eq@vspan \eq@vspan=\z@skip     % Glue used to vcenter the eq number
+\newmuskip\eq@binoffset \eq@binoffset=\eqbinoffset % Roughly, \eqbinoffset + \eqdelimoffset
+\newsavebox\EQ@box               % Storage for equation body
+\newsavebox\EQ@copy              % For eq body sans vadjust/insert/mark material
+\newsavebox\EQ@numbox            % For equation number
+\newdimen\eq@wdNum         % width of number + separation [NEW]
+\newsavebox\GRP@numbox            % For group number [NEW]
+\newdimen\grp@wdNum         % width of number + separation [NEW]
+%%B\EQ@vimbox            % Vadjust, insert, or mark material
+%%B\EQ@vimcopy           % Spare copy of same
+%%B\eq@impinging         % Temporary box for measuring number placement
+\newcount \eq@lines          % Internal counter, actual number of lines
+\newcount \eq@curline       % Loop counter
+\newcount \eq@badness      % Used in testing for overfull lines
+\newcount \EQ@vims          % For bookkeeping
+\def\@eq@numbertrue{\let\eq@hasNumber\@True}%
+\def\@eq@numberfalse{\let\eq@hasNumber\@False}%
+\let\eq@hasNumber\@False
+\newdimen\eq@dp         % Depth of last line
+\newdimen\eq@wdL        % Width of the left-hand-side
+\newdimen\eq@wdT        % Total width for framing
+\newdimen\eq@wdMin      % Width of narrowest line in equation
+\newdimen\grp@wdL       % Max width of LHS's in a group
+\newdimen\grp@wdR       % Max RHS of all equations in a group
+\newdimen\grp@wdT
+\newdimen\eq@wdRmax
+\newdimen\eq@firstht    % Height of first line
+\newdimen\eq@wdCond
+\newdimen\eq@indentstep % Indent amount when LHS is not present
+\newdimen\eq@linewidth  % Width actually used for display
+\newdimen\grp@linewidth % Max eq@linewidth over a group
+\newdimen\eq@hshift
+\let\eq@isIntertext\@False
+\eq@indentstep=\maxdimen
+\newdimen\eq@given@sidespace
+\def\eq@overrun{0pt}
+\@ifpackagewith{amsmath}{leqno}{%
+  \@ifpackagewith{amsmath}{reqno}{}{\def\eqnumside{L}}%
+}{%
+  \def\@tempa#1,leqno.clo,#2#3\@nil{%
+    \ifx @#2\relax\else \def\eqnumside{L}\fi
+  }%
+  \@xp\@tempa\@filelist,leqno.clo,@\@nil
+  \if L\eqnumside
+  \else
+    \@ifundefined{iftagsleft@}{}{%
+      \edef\eqnumside{%
+        \if TT\csname fi\endcsname\csname iftagsleft@\endcsname
+          L\else R\fi
+      }%
+    }
+  \fi
+}
+\@ifpackagewith{amsmath}{fleqn}{%
+  \def\eqindent{I}%
+}{%
+  \def\@tempa#1,fleqn.clo,#2#3\@nil{%
+    \ifx @#2\relax\else \def\eqindent{I}\fi
+  }%
+  \@xp\@tempa\@filelist,fleqn.clo,@\@nil
+  \if I\eqindent
+  \else
+    \@ifundefined{if@fleqn}{}{%
+      \edef\eqindent{%
+        \if TT\csname fi\endcsname\csname if@fleqn\endcsname
+          I\else C\fi
+      }%
+    }%
+  \fi
+}
+  \@ifundefined{mathindent}{%
+    \newdimen\mathindent
+  }{%
+    \@ifundefined{@mathmargin}{}{%
+      \mathindent\@mathmargin
+    }%
+  }
+\let\EQ@hasLHS=\@False
+\let\EQ@QED=\@empty
+\def\mark@lhs#1{%
+  \ifnum\lr@level<\@ne
+    \let\mark@lhs\relax
+    \global\let\EQ@hasLHS=\@True
+    \global\let\EQ@prebin@space\EQ@prebin@space@a
+    \mark@lhs@a
+    \penalty9999 % instead of normal \rel@break
+  % else no penalty = forbid break
+  \fi
+}
+\def\mark@lhs@a{%
+  \mskip\thickmuskip \@@vadjust{\penalty\tw@}\penalty-\@Mi\@@vadjust{}%
+}
+\newcommand\hiderel[1]{\mathrel{\advance\lr@level\@ne#1}}
+%%%%\let\m@@Bin\m@Bin
+%%%%%\let\m@@Rel\m@Rel
+\let\EQ@prebin@space\relax
+\def\EQ@prebin@space@a{\mskip-\eq@binoffset \keep@glue \mskip\eq@binoffset}
+\def\bin@break{\ifnum\lastpenalty=\z@\penalty\prebinoppenalty\fi
+  \EQ@prebin@space}
+\def\rel@break{%
+  \ifnum\abs@num\lastpenalty <\abs@num\prerelpenalty
+    \penalty\prerelpenalty
+  \fi
+}
+\ExplSyntaxOn
+%%%\def\d@@Bin{\bin@break \m@@Bin}
+%%%%\def\d@@Rel{\mark@lhs \rel@break \m@@Rel}
+\cs_set:Npn \math_dsym_Bin:Nn {\bin@break\math_bsym_Bin:Nn}
+\cs_set:Npn \math_dsym_Rel:Nn {\mark@lhs \rel@break \math_bsym_Rel:Nn }
+\ExplSyntaxOff
+\ExplSyntaxOn
+%%\let\m@@symRel\@symRel
+%%%\def\d@@symRel{\mark@lhs \rel@break \m@@symRel}
+
+\cs_set_protected:Npn \math_dcsym_Bin:Nn {\bin@break \math_bcsym_Bin:Nn}
+\cs_set_protected:Npn \math_dcsym_Rel:Nn { \mark@lhs \rel@break \math_bcsym_Rel:Nn}
+
+%%\let\m@@symBin\@symBin \def\d@@symBin{\bin@break \m@@symBin}
+%%\let\m@@symDel\@symDel
+%%\let\m@@symDeR\@symDeR
+%%\let\m@@symDeB\@symDeB
+%%\let\m@@symDeA\@symDeA
+
+\def\display@setup{%
+  \medmuskip\Dmedmuskip \thickmuskip\Dthickmuskip
+   \math_setup_display_symbols:
+  %%\let\m@Bin\d@@Bin \let\m@Rel\d@@Rel
+  %%\let\@symRel\d@@symRel \let\@symBin\d@@symBin
+  %%\let\m@DeL\d@@DeL \let\m@DeR\d@@DeR \let\m@DeB\d@@DeB
+  %%\let\m@DeA\d@@DeA
+  %%\let\@symDeL\d@@symDeL \let\@symDeR\d@@symDeR
+  %%\let\@symDeB\d@@symDeB \let\@symDeA\d@@symDeA
+  \let\left\eq@left \let\right\eq@right \global\lr@level\z@
+  \global\eq@wdCond\z@          %BRM: new
+  \everyhbox{\everyhbox\@emptytoks
+    \let\display@setup\relax \textmath@setup \let\textmath@setup\relax
+  }%
+  \everyvbox{\everyvbox\@emptytoks
+    \let\display@setup\relax \textmath@setup \let\textmath@setup\relax
+  }%
+}
+\def\dseries@display@setup{%
+  \medmuskip\Dmedmuskip \thickmuskip\Dthickmuskip
+  \math_setup_display_symbols:
+%%%%  \let\m@Bin\d@@Bin
+%%%\let\m@Rel\d@@Rel
+%%%  \let\@symRel\d@@symRel
+%%% \let\@symBin\d@@symBin
+%%%  \let\m@DeL\d@@DeL \let\m@DeR\d@@DeR \let\m@DeB\d@@DeB
+%%%  \let\m@DeA\d@@DeA
+%%%  \let\@symDeL\d@@symDeL \let\@symDeR\d@@symDeR
+%%%  \let\@symDeB\d@@symDeB \let\@symDeA\d@@symDeA
+  \let\left\eq@left \let\right\eq@right \global\lr@level\z@
+  \everyhbox{\everyhbox\@emptytoks
+    \let\display@setup\relax \textmath@setup \let\textmath@setup\relax
+  }%
+  \everyvbox{\everyvbox\@emptytoks
+    \let\display@setup\relax \textmath@setup \let\textmath@setup\relax
+  }%
+ \displaystyle
+}
+\def\textmath@setup{%
+   \math_setup_inline_symbols:
+%%%%  \let\m@Bin\m@@Bin \let\m@Rel\m@@Rel
+%%%%  \let\@symRel\m@@symRel \let\@symBin\m@@symBin
+%%%%  \let\m@DeL\m@@DeL \let\m@DeR\m@@DeR \let\m@DeB\m@@DeB
+%%%%  \let\m@DeA\m@@DeA
+%%%%  \let\@symDeL\m@@symDeL \let\@symDeR\m@@symDeR
+%%%%  \let\@symDeB\m@@symDeB \let\@symDeA\m@@symDeA
+  \let\left\@@left \let\right\@@right
+}
+
+\ExplSyntaxOff
+\@ifundefined{@displaytrue}{%
+  \@xp\newif\csname if@display\endcsname
+  \everydisplay\@xp{\the\everydisplay \@displaytrue}%
+}{}
+\define@key{breqn}{label}{%
+  \edef\next@label{\noexpand\label{\next@label@pre#1}}%
+  \let\next@label@pre\@empty}
+\define@key{breqn}{labelprefix}{\def\next@label@pre{#1}}
+\global\let\next@label\@empty
+\global\let\next@label@pre\@empty
+\define@key{breqn}{number}{\def\eq@number{#1}%
+  \let\@currentlabel\eq@number
+}
+\define@key{breqn}{shiftnumber}{\let\eq@shiftnumber\@True}
+\define@key{breqn}{holdnumber}{\let\eq@holdnumber\@True}
+\define@key{breqn}{density}{\def\eq@density@factor{#1}}
+\define@key{breqn}{indentstep}{\eqindentstep#1\relax}
+\define@key{breqn}{compact}[-99]{\prerelpenalty=#1\relax}
+\define@key{breqn}{layout}[?]{%
+  \edef\eq@layout{\@car#1?\@nil}%
+}
+\define@key{breqn}{spread}{%
+  \addtolength\eqlinespacing{#1}%
+  \addtolength\eqlineskip{#1}%
+  \eqlineskiplimit\eqlineskip
+}
+\define@key{breqn}{sidespace}{%
+  \setlength\eq@given@sidespace{#1}%
+}
+\define@key{breqn}{style}{\eqstyle\@xp{\the\eqstyle #1}}
+\define@key{breqn}{shortskiplimit}{\def\eq@shortskiplimit{#1}}
+\def\eq@shortskiplimit{2em}
+\define@key{breqn}{frame}[\fboxrule]{\def\eq@frame{T}%
+  \dim@a#1\relax\edef\eq@framewd{\the\dim@a}%
+  \freeze@glue\eqlinespacing \freeze@glue\eqlineskip
+}
+\define@key{breqn}{fullframe}[]{\def\eq@frame{U}%
+  \freeze@glue\eqlinespacing \freeze@glue\eqlineskip
+}
+\def\eq@frame{F} % no frame
+\def\eq@framewd{\fboxrule}
+\define@key{breqn}{framesep}[\fboxsep]{%
+  \if\eq@frame F\def\eq@frame{T}\fi
+  \dim@a#1\relax \edef\eq@framesep{\the\dim@a}%
+  \freeze@glue\eqlinespacing \freeze@glue\eqlineskip
+}
+\def\eq@framesep{\fboxsep}
+\define@key{breqn}{background}{\def\eq@background{#1}%
+  \freeze@glue\eqlinespacing \freeze@glue\eqlineskip
+}
+\define@key{breqn}{color}{\def\eq@foreground{#1}}
+\define@key{breqn}{center}[]{\let\eq@centerlines\@True}
+\define@key{breqn}{nocenter}[]{\let\eq@centerlines\@False}
+\let\eq@centerlines\@False
+\define@key{breqn}{noalign}[]{\let\grp@aligned\@False}
+\let\grp@aligned\@True % default
+\define@key{breqn}{breakdepth}{\eqbreakdepth#1\relax}
+\define@key{breqn}{cols}{\global\let\@preamble\@empty
+  \darray@mkpream#1\@percentchar
+}
+\newenvironment{dmath}{%
+ \let\eq@hasNumber\@True \@optarg\@dmath{}}{}
+\def\@dmath[#1]{%
+  \everydisplay\expandafter{\the\everydisplay \display@setup}%
+  \if@noskipsec \leavevmode \fi
+  \if@inlabel \leavevmode \global\@inlabelfalse \fi
+  \if\eq@group\else\eq@prelim\fi
+  \setkeys{breqn}{#1}%
+  \the\eqstyle
+  \eq@setnumber
+  \begingroup
+  \eq@setup@a
+  \eq@startup
+}
+\def\enddmath#1{\check@punct@or@qed}
+\def\end@dmath{%
+  \gdef\EQ@setwdL{}% Occasionally undefined ???
+  \eq@capture
+  \endgroup
+  \EQ@setwdL
+  \eq@measure
+  \if\eq@group \grp@push \else \eq@finish\fi
+}
+\newenvironment{dmath*}{%
+  \let\eq@hasNumber\@False \@optarg\@dmath{}%
+}{}
+\@namedef{end@dmath*}{\end@dmath}
+\@namedef{enddmath*}#1{\check@punct@or@qed}
+\def\eq@prelim{%
+  \if@inlabel \indent \par \fi
+  \if@nobreak \global\@nobreakfalse \predisplaypenalty\@M \fi
+  \everypar\@emptytoks
+  \noindent
+  \eq@nulldisplay
+  \par %% \eq@saveparinfo %% needs work
+  \let\intertext\breqn@intertext
+}
+\def\breqn@parshape@warning{%
+  \PackageWarning{breqn}{%
+    Complex paragraph shape cannot be followed by this equation}%
+}
+\let\eq@prevshape\@empty
+\def\eq@saveparinfo{%
+  \count@\prevgraf \advance\count@-\thr@@ % for the null display
+  \edef\eq@prevshape{\prevgraf\the\count@\space}%
+  \ifcase\parshape
+    % case 0: no action required
+  \or \edef\eq@prevshape{\eq@prevshape
+        \parshape\@ne\displayindent\displaywidth\relax
+      }%
+  \else
+    \breqn@parshape@warning
+  \fi
+}
+\def\eq@setnumber{%
+  \eq@wdNum\z@
+  \if\eq@hasNumber
+    \ifx\eq@number\@empty
+      \stepcounter{equation}\let\eq@number\theequation
+    \fi
+ % This sets up numbox, etc, even if unnumbered?????
+    \ifx\eq@number\@empty
+    \else
+      \set@label{equation}\eq@number
+      \global\sbox\EQ@numbox{%
+        \next@label \global\let\next@label\@empty
+        \eqnumcolor\eqnumsize\eqnumfont{\eqnumform{\eq@number}}%
+      }%
+      \global\eq@wdNum\wd\EQ@numbox\global\advance\eq@wdNum\eqnumsep
+    \fi
+  \fi
+}
+\newcount\eq@final@linecount
+\let\eq@GRP@first@dmath\@True
+\def\eq@finish{%
+  \begingroup
+    \if F\eq@frame\else
+      \freeze@glue\eqlinespacing \freeze@glue\eqlineskip
+    \fi
+    \csname eq@\eqindent @setsides\endcsname % Compute \leftskip,\rightskip
+    \adjust@parshape\eq@parshape% Final adjustment of parshape for left|right skips
+    \if\eq@group
+      \if\eq@GRP@first@dmath
+        \global\let\eq@GRP@first@dmath\@False
+        \xdef\dmath@first@leftskip{\leftskip=\the\leftskip\relax}%
+      \else
+        \eq@topspace{\vskip\parskip}% Set top spacing
+      \fi
+    \else
+      \eq@topspace{\vskip\parskip}% Set top spacing
+    \fi
+    \afterassignment\remove@to@nnil
+    \eq@final@linecount=\expandafter\@gobble\eq@parshape\@nnil
+    \if\eq@hasNumber
+      \if\eq@shiftnumber
+        \csname eq@typeset@\eqnumside Shifted\endcsname
+      \else
+        \ifnum\eq@final@linecount=\@ne
+          \csname eq@typeset@\eqnumside @single\endcsname
+        \else
+          \csname eq@typeset@\eqnumside\eqnumplace\endcsname
+        \fi
+      \fi
+    \else
+      \eq@typeset@Unnumbered
+    \fi
+  \endgroup
+  \eq@botspace
+}
+\def\eq@typeset@L@single{%
+  \nobreak
+  \eq@params\eq@parshape
+  \nointerlineskip\noindent
+  \add@grp@label
+  \rlap{\kern-\leftskip\box\EQ@numbox}%
+  \if F\eq@frame
+  \else
+    \rlap{\raise\eq@firstht\hbox to\z@{\eq@addframe\hss}}%
+  \fi
+  \eq@dump@box\unhbox\EQ@box \@@par
+}
+\def\eq@typeset@R@single{%
+  \nobreak
+  \eq@params\eq@parshape
+  \nointerlineskip\noindent
+  \add@grp@label
+  \if F\eq@frame
+  \else
+    \rlap{\raise\eq@firstht\hbox to\z@{\eq@addframe\hss}}%
+  \fi
+  \rlap{\kern-\leftskip\kern\linewidth\kern-\wd\EQ@numbox\copy\EQ@numbox}%
+  \eq@dump@box\unhbox\EQ@box
+  \@@par
+}
+\def\peek@branch#1#2{%
+  \let\peek@b#1\let\peek@space#2\futurelet\@let@token\peek@a
+}
+\def\peek@skipping@spaces#1{\peek@branch#1\peek@skip@space}
+\def\peek@a{%
+  \ifx\@let@token\@sptoken \expandafter\peek@space
+  \else \expandafter\peek@b\fi
+}
+\lowercase{\def\peek@skip@space} {\futurelet\@let@token\peek@a}%
+\def\check@punct{\futurelet\@let@token\check@punct@a}
+\def\check@punct@a{%
+  \edef\@tempa{%
+    \ifx\@let@token\@sptoken\@nx\finish@end
+    \else\ifx\@let@token ,\@nx\check@qed
+    \else\ifx\@let@token .\@nx\check@qed
+    \else\check@punct@b % check the less common possibilities
+    \fi\fi\fi
+  }%
+  \@tempa
+}
+\begingroup
+\toks@a{%
+  \ifx\@let@token ;\@nx\check@qed
+  \else\ifx\@let@token ?\@nx\check@qed
+  \else\ifx\@let@token !\@nx\check@qed
+}
+\toks@c{\fi\fi\fi}% matching with \toks@a
+\catcode`\.=\active \catcode`\,=\active \catcode`\;=\active
+\catcode`\?=\active \catcode`\!=\active
+\toks@b{%
+  \else\ifx\@let@token ,\@nx\check@qed
+  \else\ifx\@let@token .\@nx\check@qed
+  \else\ifx\@let@token ;\@nx\check@qed
+  \else\ifx\@let@token ?\@nx\check@qed
+  \else\ifx\@let@token !\@nx\check@qed
+  \else\@nx\finish@end
+  \fi\fi\fi\fi\fi
+}
+\xdef\check@punct@b{%
+  \the\toks@a\the\toks@b\the\toks@c
+}
+\endgroup
+\let\found@punct\@empty
+\def\check@qed#1{%
+  \gdef\found@punct{#1}%
+  \peek@skipping@spaces\check@qed@a
+}
+\def\check@qed@a{%
+  \ifx\end\@let@token \@xp\check@qed@b
+  \else \@xp\finish@end
+  \fi
+}
+\def\check@qed@b#1#2{%
+  \@ifundefined{#2qed}{}{%
+    \toks@\@xp{\found@punct\csname#2qed\endcsname}%
+    \xdef\found@punct{\the\toks@}%
+  }%
+  \finish@end
+  \end{#2}%
+}
+\def\@tempa#1\endcsname#2\@nil{\def\latex@end##1{#2}}
+\expandafter\@tempa\end{#1}\@nil
+\def\end#1{\csname end#1\endcsname \latex@end{#1}}%
+\def\check@punct@or@qed#1{%
+  \xdef\found@punct{\@empty}% BRM: punctuation was being remembered past this eqn.
+  % WSPR: err, why isn't that just \global\let\found@punct\@empty ?
+  \def\finish@end{\csname end@#1\endcsname\latex@end{#1}}%
+  \check@punct
+}
+\newcommand\eqpunct[1]{\thinspace#1}
+\providecommand\set@label[2]{\protected@edef\@currentlabel{#2}}
+\def\eq@topspace#1{%
+  \begingroup
+    \global\let\EQ@shortskips\@False
+    \if\@And{\eq@group}{\@Not\eq@GRP@first@dmath}%
+        \parskip\intereqskip \penalty\intereqpenalty
+    \else
+      \eq@check@shortskip
+      \if\EQ@shortskips
+        \parskip\abovedisplayshortskip
+        \aftergroup\belowdisplayskip\aftergroup\belowdisplayshortskip
+        \ifdim\predisplaysize>\z@\nointerlineskip\fi
+      \else
+        \parskip\abovedisplayskip
+      \fi
+    \fi
+    \if F\eq@frame
+    \else
+      \addtolength\parskip{\eq@framesep+\eq@framewd}%
+    \fi
+    #1%
+  \endgroup
+}
+\def\eq@check@shortskip {%
+  \global\let\EQ@shortskips\@False
+  \setlength\dim@a{\abovedisplayskip+\ht\EQ@numbox}%
+  \ifdim\leftskip<\predisplaysize
+  \else
+    \ifdim -\maxdimen=\predisplaysize
+    \else
+      \if R\eqnumside
+        \global\let\EQ@shortskips\@True
+      \else
+        \if\eq@shiftnumber
+        \else
+          \if T\eqnumplace
+            \ifdim\dim@a<\eq@firstht
+              \global\let\EQ@shortskips\@True
+            \fi
+          \else
+            \setlength\dim@b{\eq@vspan/2}%
+            \ifdim\dim@a<\dim@b
+              \global\let\EQ@shortskips\@True
+            \fi
+          \fi
+        \fi
+      \fi
+    \fi
+  \fi
+}
+\def\eq@botspace{%
+  \penalty\postdisplaypenalty
+  \if F\eq@frame
+  \else
+    \addtolength\belowdisplayskip{\eq@framesep+\eq@framewd}%
+  \fi
+  \vskip\belowdisplayskip
+  \@endpetrue % kill parindent if current paragraph continues
+  \global\@ignoretrue % ignore following spaces
+  \eq@resume@parshape
+}
+\def\eq@resume@parshape{}
+\def\eq@startup{%
+  \global\let\EQ@hasLHS\@False
+  \setbox\z@\vbox\bgroup
+    \noindent \@@math \displaystyle
+    \penalty-\@Mi
+}
+\def\eq@setup@a{%
+  \everymath\everydisplay
+  %\let\@newline\eq@newline % future possibility?
+  \let\\\eq@newline
+  \let\insert\eq@insert \let\mark\eq@mark \let\vadjust\eq@vadjust
+  \hsize\maxdimen \pretolerance\@M
+  \linepenalty\@m
+  \rightskip\z@\@plus\@M\p@ \leftskip\z@skip \parfillskip\z@skip
+  \clubpenalty\@ne \widowpenalty\z@ \interlinepenalty\z@
+  \global\let\EQ@prebin@space\relax
+  \binoppenalty\@M \relpenalty\@M
+}
+\newdimen\eq@wdR\eq@wdR\z@%BRM
+\def\eq@capture{%
+  \ifnum\lastpenalty>-\@M \penalty-\@Mi \fi
+  \keep@glue\@@endmath
+  \eq@addpunct
+  \@@par
+  \eq@wdL\z@
+  \setbox\tw@\lastbox
+  \global\setbox\EQ@box\hbox{\unhbox\tw@\unskip\unskip\unpenalty}%
+  \unskip\unpenalty
+  \global\setbox\EQ@copy\copy\EQ@box
+%%  \global\setbox\EQ@vimcopy\copy\EQ@vimbox
+  \clubpenalty\z@
+  \eq@wdR\z@%BRM: eq@wdL patch
+  \eq@repack % recursive
+  \setbox\tw@\lastbox
+  \global\setbox\EQ@box\hbox{\unhcopy\tw@\unskip\unpenalty \unhbox\EQ@box}%
+  \global\setbox\EQ@copy\hbox{\unhbox\tw@\unskip\unpenalty \unhbox\EQ@copy}%
+  \ifdim\eq@wdR>\z@% BRM:  eq@wdL patch
+    \setlength\dim@a{\wd\EQ@box-\eq@wdR
+    % Apparently missing a \thickmuskip = 5mu = 5/18em=0.27777777777.. ?
+       + 0.2777777777777em}% FUDGE??!?!?!
+    \ifdim\dim@a>\eq@wdL
+      \eq@wdL\dim@a
+      \xdef\EQ@setwdL{\eq@wdL\the\eq@wdL\relax}%
+    \fi
+  \fi
+  \egroup % end vbox started earlier
+}
+\def\eq@addpunct{%
+  \ifx\found@punct\@empty
+  \else \eqpunct{\found@punct}%
+  \fi
+  % BRM: Added; the punctuation kept  getting carried to following environs
+  \xdef\found@punct{\@empty}%
+  \EQ@afterspace
+}
+\global\let\EQ@afterspace\@empty
+\def\eq@repack{%
+  \ifcase\lastpenalty
+     % case 0: normal case
+    \setbox\tw@\lastbox
+    \eq@repacka\EQ@copy \eq@repacka\EQ@box
+    \unskip
+  \or % case 1: finished recursing
+    \unpenalty
+    \setbox\tw@\lastbox
+    \eq@repacka\EQ@copy \eq@repacka\EQ@box
+    \@xp\@gobble
+  \or % case 2: save box width = LHS width
+    \unpenalty
+    \setbox\tw@\lastbox
+    \setbox\z@\copy\tw@ \setbox\z@\hbox{\unhbox\z@\unskip\unpenalty}%
+    \addtolength\eq@wdL{\wd\z@}
+    \setlength\eq@wdR{\wd\EQ@box}% BRM:  eq@wdL patch
+    \xdef\EQ@setwdL{\eq@wdL\the\eq@wdL\relax}%
+    \global\setbox\EQ@copy\hbox{%
+      \hbox{\unhcopy\tw@\unskip\unpenalty\unskip}%
+      \box\EQ@copy
+    }%
+    \global\setbox\EQ@box\hbox{%
+      \hbox{\unhbox\tw@\unskip\unpenalty\unskip}%
+      \box\EQ@box
+    }%
+    \unskip
+  \or % case 3: unpack left-right box
+    \unpenalty
+    \eq@lrunpack
+  \else
+    \breqn@repack@err
+  \fi
+  \eq@repack % RECURSE
+}
+\def\breqn@repack@err{%
+  \PackageError{breqn}{eq@repack penalty neq 0,1,2,3}\relax
+}
+\def\eq@repacka#1{%
+  \global\setbox#1\hbox{\unhcopy\tw@ \unskip
+    \count@-\lastpenalty
+    \ifnum\count@<\@M \else \advance\count@-\@M \fi
+    \unpenalty
+    \ifx\EQ@copy#1\ifnum\count@>\thr@@ \count@\@ne\fi\fi
+    \ifcase\count@
+        % case 0, normal line break
+      \penalty-\@M % put back the linebreak penalty
+    \or % case 1, do nothing (end of equation)
+      \relax
+    \or % case 2, no-op (obsolete case)
+    \or % case 3, transfer vspace and/or penalty
+      \ifx#1\EQ@box \eq@revspace \else \eq@revspaceb \fi
+    \or % case 4, put back an insert
+      \eq@reinsert
+    \or % case 5, put back a mark
+      \eq@remark
+    \or % case 6, put back a vadjust
+      \eq@readjust
+    \else % some other break penalty
+      \penalty-\count@
+    \fi
+    \unhbox#1}%
+}
+\def\eq@nulldisplay{%
+  \begingroup \frozen@everydisplay\@emptytoks
+  \@@display
+  \predisplaypenalty\@M \postdisplaypenalty\@M
+  \abovedisplayskip\z@skip \abovedisplayshortskip\z@skip
+  \belowdisplayskip\z@skip \belowdisplayshortskip\z@skip
+  \xdef\EQ@displayinfo{%
+    \prevgraf\the\prevgraf \predisplaysize\the\predisplaysize
+    \displaywidth\the\displaywidth \displayindent\the\displayindent
+    \listwidth\the\linewidth
+    \ifdim\displayindent>\z@
+      \advance\listwidth\the\leftmargin
+      \advance\listwidth\the\rightmargin
+    \fi
+    \relax}%
+  \halign{##\cr}%
+  \@@enddisplay
+  \par
+  \endgroup
+  \EQ@displayinfo
+}
+\def\eq@newline{%
+  \@ifstar{\eq@newlinea\@M}{\eq@newlinea\eqinterlinepenalty}}
+\def\eq@newlinea#1{%
+  \@ifnext[{\eq@newlineb{#1}}{\eq@newlineb{#1}[\maxdimen]}}
+\def\eq@newlineb#1[#2]{\penalty-\@M}
+\def\eq@revspace{%
+  \global\setbox\EQ@vimbox\vbox{\unvbox\EQ@vimbox
+    \unpenalty
+    \global\setbox\@ne\lastbox}%
+  \@@vadjust{\unvbox\@ne}%
+  \penalty-\@M
+}
+\def\eq@revspaceb{%
+  \global\setbox\EQ@vimcopy\vbox{\unvbox\EQ@vimcopy
+    \unpenalty
+    \global\setbox\@ne\lastbox}%
+  \@@vadjust{\unvbox\@ne}%
+  \penalty-\@M
+}
+\def\eq@break#1{\penalty-1000#1 \keep@glue}
+\let\@parshape\@empty
+\def\eq@measure{%
+  \ifdim\eq@indentstep=\maxdimen \eq@indentstep\eqindentstep \fi
+  \ifdim\eq@linewidth=\z@ \else \edef\eq@linewidths{{\the\eq@linewidth}}\fi
+  \begingroup \eq@params
+  \leftskip\z@skip
+  \rightskip\z@\@plus\columnwidth\@minus\hfuzz
+  \global\EQ@continue{\eq@trial}%
+  \eq@trial % uses \eq@linewidths
+  \eq@failout % will be a no-op if the trial succeeded
+  \endgroup
+  \EQ@trial
+}
+\let\EQ@trial\@empty
+\newtoks\EQ@continue
+\let\EQ@widths\@empty
+\let\EQ@fallback\@empty
+\def\eq@linewidths{\displaywidth\linewidth\columnwidth}
+\def\eq@trial{%
+  \ifx\@empty\eq@linewidths
+    \global\EQ@continue{}%
+  \else
+    \iffalse{\fi \@xp\eq@trial@a \eq@linewidths}%
+  \fi
+  \the\EQ@continue
+}
+\def\eq@trial@a#1{%
+  \dim@c#1\relax
+  \if T\eq@frame \eq@frame@adjust\dim@c \fi
+  \ifdim\dim@c>\eq@linewidth
+    \eq@linewidth\dim@c
+    \let\eq@trial@b\eq@trial@d
+    \csname eq@try@layout@\eq@layout\endcsname
+  \fi
+  \edef\eq@linewidths{\iffalse}\fi
+}
+\def\eq@frame@adjust#1{%
+  %\addtolength#1{-2\eq@framewd-2\eq@framesep}%
+  \dim@a\eq@framewd \advance\dim@a\eq@framesep
+  \advance#1-2\dim@a
+}
+\def\eq@trial@succeed{%
+  \aftergroup\@gobbletwo % cancel the \EQ@fallback code; see \eq@trial@c (?)
+  \global\EQ@continue{\eq@trial@done}%
+}
+\def\eq@trial@done{%
+  \let\eq@failout\relax
+}
+\def\eq@trial@init{\global\let\EQ@fallback\eq@nextlayout}
+\def\eq@nextlayout#1{%
+  \endgroup
+  \begingroup #1%
+}
+\def\eq@failout{%
+  \global\let\EQ@trial\EQ@last@trial
+}
+\def\eq@trial@save#1{%
+  \xdef#1{%
+    \eq@linewidth\the\eq@linewidth
+    % save info about the fit
+    \eq@lines\the\eq@lines \eq@badness\the\eq@badness \def\@nx\eq@badline{\eq@badline}%
+    % save size info
+    \eq@wdT\the\eq@wdT \eq@wdMin\the\eq@wdMin
+    \eq@vspan\the\eq@vspan \eq@dp\the\eq@dp \eq@firstht\the\eq@firstht
+    % save info about the LHS
+    \eq@wdL\the\eq@wdL \def\@nx\EQ@hasLHS{\EQ@hasLHS}%
+    % save info about the numbering
+    \def\@nx\eq@hasNumber{\eq@hasNumber}%
+    % save info about the chosen layout
+    \def\@nx\eq@layout{\eq@layout}%
+    \def\@nx\eq@parshape{\@parshape}%
+    \def\@nx\eq@measurements{\eq@measurements}%
+    \def\@nx\adjust@rel@penalty{\adjust@rel@penalty}%
+    \def\@nx\eq@shiftnumber{\eq@shiftnumber}%
+    \def\@nx\eq@isIntertext{\@False}%
+  }%
+}
+\def\eq@trial@b{\eq@trial@c}
+\def\eq@trial@c#1#2{%
+  \begingroup
+  \eq@trial@init
+  \def\eq@layout{#1}%
+  \setbox\z@\vbox{%
+    \hfuzz\maxdimen
+    \eq@trial@p % run the given parshape
+    \if\@Not{\eq@badline}%
+      \eq@trial@save\EQ@trial
+      \if\eq@hasNumber\eq@retry@with@number\fi
+      \if L\eq@layout \eq@check@density
+      \else
+        \if\@Not{\eq@badline}%
+           \eq@trial@succeed
+        \fi
+      \fi
+    \else
+      \eq@trial@save\EQ@last@trial
+    \fi
+  }%
+  \EQ@fallback{#2}%
+  \endgroup
+}
+\def\eq@trial@d#1#2{\eq@trial@c{#1}{}}
+\def\eq@check@density{%
+  \if\@Or{\@Not\EQ@hasLHS}{\eq@shortLHS}%
+    \eq@trial@succeed
+  \else\if\eq@dense@enough
+    \eq@trial@succeed
+  \fi\fi
+}
+\def\eq@shortLHS{\ifdim\eq@wdL>.44\eq@wdT 1\else 0\fi 0}
+\def\eq@trial@p{%
+  \@parshape %
+  \eq@dump@box\unhcopy\EQ@copy
+  {\@@par}% leave \parshape readable
+  \eq@lines\prevgraf
+  \eq@fix@lastline
+  \let\eq@badline\@False
+  \if i\eq@layout \ifnum\eq@lines>\@ne \let\eq@badline\@True \fi\fi
+  \eq@curline\eq@lines % loop counter for eq@measure@lines
+  \let\eq@measurements\@empty
+  \eq@ml@record@indents
+  \eq@measure@lines
+  \eq@recalc
+}
+\let\adjust@rel@penalty\@empty
+\def\eq@fix@lastline{%
+  \setbox\tw@\lastbox \dim@b\wd\tw@
+  \eq@dp\dp\tw@
+  \nointerlineskip\hbox to\dim@b{\unhbox\tw@
+    \skip@c\lastskip \unskip\unskip\hskip\skip@c
+  }%
+}
+\def\eq@recalc{%
+  \eq@wdT\z@ \eq@wdMin\maxdimen \eq@vspan\z@skip \eq@badness\z@
+  \let\@elt\eq@recalc@a \eq@measurements \let\@elt\relax
+}
+\def\eq@recalc@a#1x#2+#3\@endelt{%
+  \eq@firstht#2\relax
+  \let\@elt\eq@recalc@b
+  \@elt#1x#2+#3\@endelt
+}
+\def\eq@recalc@b#1X#2,#3x#4+#5@#6\@endelt{%
+  \setlength\dim@a{#2+#3}%
+  \ifdim\dim@a>\eq@wdT \eq@wdT\dim@a \fi
+  \ifdim\dim@a<\eq@wdMin \eq@wdMin\dim@a \fi
+  \eq@dp#5\relax
+  \addtolength\eq@vspan{#1+#4+\eq@dp}%
+  \ifnum#6>\eq@badness \eq@badness#6\relax\fi
+}
+\def\eq@layout{?}
+\@namedef{eq@try@layout@?}{%
+  \let\eq@trial@b\eq@trial@c
+  \edef\@parshape{\parshape 1 0pt \the\eq@linewidth\relax}%
+  \setlength\dim@a{\wd\EQ@copy-2em}% Fudge; can't shrink more than this?
+  % if we're in a numbered group, try hard to fit within the numbers
+  \dim@b\eq@linewidth
+  \if\eq@shiftnumber\else\if\eq@group
+    \if\eq@hasNumber\addtolength\dim@b{-\wd\EQ@numbox-\eqnumsep}%
+    \else\if\grp@hasNumber\addtolength\dim@b{-\wd\GRP@numbox-\eqnumsep}%
+  \fi\fi\fi\fi
+  \ifdim\dim@a<\dim@b% Do we even have a chance of fitting to one line?
+    \setlength\dim@b{\columnwidth-\dim@a+\eq@wdCond}%
+    \rightskip\z@\@plus\dim@b\@minus\hfuzz
+    \eq@trial@b{i}{\eq@try@layout@multi}%
+  \else
+   \eq@try@layout@multi
+  \fi
+}
+\def\eq@try@layout@multi{%
+  \if\EQ@hasLHS
+    \ifdim\eq@wdL>\eq@linewidth
+       \setlength\dim@a{\wd\EQ@copy-\eq@wdL}%
+       \ifdim\dim@a<.25\eq@linewidth \eq@try@layout@S
+       \else \eq@try@layout@l
+       \fi
+    % BRM: Originally .7: Extreme for L since rhs has to wrap within the remaining 30+%!
+    \else\ifdim\eq@wdL>.50\eq@linewidth
+      \eq@try@layout@D
+    \else
+      \eq@try@layout@L
+    \fi\fi
+  \else
+    \eq@try@layout@S % (already checked case i)
+  \fi
+}
+\def\eq@try@layout@D{%
+  \setlength\dim@a{\eq@linewidth -\eq@indentstep}%
+  \edef\@parshape{\parshape 2
+    0pt \the\eq@wdL\space \the\eq@indentstep\space \the\dim@a\relax
+  }%
+  \def\adjust@rel@penalty{\penalty-99 }%
+  \eq@trial@b{D}{\eq@try@layout@A}%
+}
+\def\eq@try@layout@L{%
+  \setlength\dim@b{\eq@linewidth-\eq@wdL}%
+  \edef\@parshape{\parshape 2 0pt \the\eq@linewidth\space
+    \the\eq@wdL\space \the\dim@b\relax
+  }%
+  \eq@trial@b{L}{\eq@try@layout@D}%
+}
+\def\eq@try@layout@S{%
+  \setlength\dim@b{\eq@linewidth-2\eqmargin}% \advance\dim@b-1em%
+  \int@a\wd\EQ@copy \divide\int@a\dim@b
+  \addtolength\dim@b{-\int@a\eq@indentstep}%
+  \if\eq@hasNumber
+    \ifdim\dim@b>15em%
+      \addtolength\dim@b{-\eq@wdNum}%
+    \fi
+  \fi
+  \int@b\z@
+  \def\@tempa{\dim}%
+  \edef\@parshape{\parshape 2 0pt \the\dim@b\space
+    \the\eqmargin\space\the\dim@b\relax}%
+  \eq@trial@b{S}{\eq@try@layout@A}%
+}
+\def\eq@try@layout@l{%
+  \setlength\dim@a{\eq@linewidth -\eq@indentstep}%
+  \int@a\eq@wdL \divide\int@a\dim@a
+  \advance\int@a\tw@
+  \edef\@parshape{\parshape \number\int@a\space
+    0pt \the\eq@linewidth
+  }%
+  \advance\int@a-\tw@
+  \setlength\dim@b{2\eq@indentstep}%
+  \setlength\dim@c{\eq@linewidth -\dim@b}%
+  \edef\@parshape{\@parshape
+    \replicate{\int@a}{\space\the\eq@indentstep\space\the\dim@a}%
+    \space\the\dim@b\space\the\dim@c\relax
+  }%
+  \eq@trial@b{l}{\eq@try@layout@A}%
+}
+\def\eq@try@layout@A{%
+  \edef\@parshape{\parshape 1 0pt \the\eq@linewidth\relax}%
+  \if\EQ@hasLHS \def\adjust@rel@penalty{\penalty-99 }\fi
+  \eq@trial@b{A}{}%
+}
+\let\eq@shiftnumber\@False
+\def\eq@retry@with@number{%
+ \if\eq@shiftnumber
+ \else
+    \ifdim\eq@wdCond>\z@\if R\eqnumside
+      \let\eq@shiftnumber\@True
+    \fi\fi
+    \dim@b\eq@wdNum
+    \if L\eqnumside
+      \ifdim\@totalleftmargin>\dim@b\dim@b\@totalleftmargin\fi
+    \else
+      \addtolength\dim@b{\@totalleftmargin}%
+    \fi
+    \setlength\dim@a{\eq@linewidth-\dim@b}%\advance\dim@a1em\relax% Allowance for shrink?
+    \int@a\@ne\if\eq@group\int@a\maxint\fi
+    \if\eq@shiftnumber               % Already know we need to shift
+    \else\ifdim\eq@wdT<\dim@a % Fits!
+    \else
+      \setlength\leftskip{\eq@wdNum}%
+      \setlength\rightskip{\z@\@plus\dim@a}%
+      \adjust@parshape\@parshape
+      \nointerlineskip
+      \edef\eq@prev@lines{\the\eq@lines}%
+      \edef\eq@prev@badness{\the\eq@badness}% BRM
+      \eq@trial@p
+      \int@a\eq@prev@badness\relax\advance\int@a 50\relax%?
+      \int@b\eq@prev@lines  \if\eq@group\advance\int@b\@ne\fi% Allow 1 extra line in group
+      \ifnum\eq@lines>\int@b % \eq@prev@lines
+        \let\eq@shiftnumber\@True
+      \else\if\eq@badline
+        \let\eq@shiftnumber\@True
+      \else\ifnum\eq@badness>\int@a % BRM: New case
+        \let\eq@shiftnumber\@True
+      \else
+      \fi\fi%\fi
+   \fi\fi\fi
+   \if\eq@shiftnumber
+     \EQ@trial% Restore parshape & other params,
+     \leftskip\z@\let\eq@shiftnumber\@True % But set shift & leftskip
+     \edef\@parshape{\eq@parshape}% And copy saved parshape back to `working copy' !?!?
+   \fi
+   \eq@trial@save\EQ@trial      % Either way, save the trial state.
+ \fi
+}
+\def\adjust@parshape#1{%
+  \@xp\adjust@parshape@a#1\relax
+  \edef#1{\temp@a}%
+}
+\def\adjust@parshape@a#1 #2\relax{%
+  \setlength\dim@a{\leftskip+\rightskip}%
+  \edef\temp@a{#1}%
+  \adjust@parshape@b#2 @ @ \relax
+}
+\def\adjust@parshape@b#1 #2 {%
+  \ifx @#1\edef\temp@a{\temp@a\relax}%
+    \@xp\@gobble
+  \else
+    \dim@b#1\relax
+    \dim@c#2\relax
+    \addtolength\dim@c{\dim@a+\dim@b}%
+    \ifdim\dim@c>\eq@linewidth\setlength\dim@c{\eq@linewidth}\fi
+     \addtolength\dim@c{-\dim@b}%
+    \edef\temp@a{\temp@a\space\the\dim@b\space\the\dim@c}%
+  \fi
+  \adjust@parshape@b
+}
+\def\eq@ml@record@indents{%
+  \int@a\z@
+  \def\@tempa{%
+    \advance\int@a\@ne
+    \@xp\edef\csname eq@i\number\int@a\endcsname{\the\dim@a}%
+    \ifnum\int@a<\int@b \afterassignment\@tempb \fi
+    \dim@a
+  }%
+  \def\@tempb{\afterassignment\@tempa \dim@a}%
+  \def\@tempc##1##2 {\int@b##2\afterassignment\@tempa\dim@a}%
+  \@xp\@tempc\@parshape
+}
+\chardef\@endelt=`\?
+\def\eq@measurements{%
+  \@elt 4.5pt/5.0pt,66.0ptx6.8pt+2.4pt@27\@endelt
+  ...
+}
+\def\eq@measure@lines{%
+  \let\eq@ml@continue\eq@measure@lines
+  \setbox\tw@\lastbox \dim@b\wd\tw@ % find target width of line
+  \setbox\z@\hbox to\dim@b{\unhbox\tw@}% check for overfull
+  \eq@badness\badness
+  \ifnum\eq@badness<\inf@bad \else \let\eq@badline\@True \fi
+  \eq@ml@a \eq@ml@continue
+}
+\def\eq@ml@a{%
+  \setbox\tw@\hbox{\unhbox\z@ \unskip}% find natural width
+  \ifdim\dim@b<\wd\tw@ \setlength\dim@a{\dim@b}% shrunken line
+  \else                \setlength\dim@a{\wd\tw@}% OK to use natural width
+  \fi
+  \addtolength\dim@a{-\leftskip}% BRM: Deduct the skip if we're retrying w/number
+  \skip@a\lastskip \unskip \unpenalty
+  \ifdim\skip@a=\z@
+    \let\eq@ml@continue\relax % end the recursion
+  \else
+    % Sum repeated vskips if present
+    \def\@tempa{%
+      \ifdim \lastskip=\z@
+      \else \addtolength\skip@a{\lastskip}\unskip\unpenalty \@xp\@tempa
+      \fi
+    }%
+  \fi
+  \edef\eq@measurements{\@elt
+    \the\skip@a\space X% extra space to facilitate extracting only the
+                        % dimen part later
+    \csname eq@i%
+      \ifnum\eq@curline<\parshape \number\eq@curline
+      \else\number\parshape
+      \fi
+    \endcsname,\the\dim@a x\the\ht\tw@+\the\dp\tw@ @\the\eq@badness\@endelt
+    \eq@measurements
+  }%
+  \advance\eq@curline\m@ne
+  \ifnum\eq@curline=\z@ \let\eq@ml@continue\relax\fi
+}
+\def\eq@ml@vspace{%
+  \global\advance\eq@vspan\lastskip \unskip\unpenalty
+  \ifdim\lastskip=\z@ \else \@xp\eq@ml@vspace \fi
+}
+\def\eq@dense@enough{%
+  \ifnum\eq@lines<\thr@@
+    \@True
+  \else
+    \ifdim\eq@wdL >.7\eq@wdT
+      \@False
+    \else \@xp\@xp\@xp\eq@dense@enough@a
+    \fi
+  \fi
+}
+\def\true@true@true   {\fi\fi\iftrue \iftrue \iftrue }
+\def\true@false@true  {\fi\fi\iftrue \iffalse\iftrue }
+\def\false@true@false {\fi\fi\iffalse\iftrue \iffalse}
+\def\false@false@false{\fi\fi\iffalse\iffalse\iffalse}
+\def\eq@density@factor{.475}
+\def\eq@dense@enough@a{%
+  \@True \fi
+  \ifnum\eq@lines>\sixt@@n
+    \eq@dense@enough@b
+  \else
+    \dim@b\z@ \let\@elt\eq@delt \eq@measurements
+    \dim@c\eq@density@factor\eq@wdT \multiply\dim@c\eq@lines
+    \ifdim\dim@b>\dim@c \true@false@true \else \false@false@false \fi
+  \fi
+}
+\def\eq@delt#1X#2,#3x#4+#5@#6\@endelt{\addtolength\dim@b{#3}}%
+\def\eq@dense@enough@b{%
+  \int@b\eq@wdT \divide\int@b\p@
+  \dim@b\eq@wdL \divide\dim@b\int@b
+  \dim@c\eq@lines\p@ \multiply\dim@c\f@ur
+  \int@b\eq@lines \multiply\int@b 9 \advance\int@b -10%
+  \divide\dim@c\int@b
+  \ifdim\dim@b<\dim@c \true@true@true \else \false@true@false \fi
+}
+\let\eq@parshape\@empty
+\def\eq@params{%
+  \baselineskip\eqlinespacing
+  \lineskip\eqlineskip \lineskiplimit\eqlineskiplimit
+  \clubpenalty\@M \widowpenalty\@M \interlinepenalty\eqinterlinepenalty
+  \linepenalty199 \exhyphenpenalty5000 % was 9999: make breaks at, eg. \* a bit easier.
+  \ifdim\hfuzz<\p@ \hfuzz\p@ \fi
+  \parfillskip\z@skip
+  \tolerance9999 \pretolerance\m@ne
+}
+\def\eq@dump@box#1#2{%
+  \noindent #1#2\setbox\f@ur\lastbox \setbox\tw@\lastbox
+  \if L\eq@layout \box\tw@ \else\unhbox\tw@\fi
+  \adjust@rel@penalty \unhbox\f@ur
+}
+\def\eq@typeset@Unnumbered{%
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@LM{%
+  \setlength\dim@a{(\eq@vspan+\ht\EQ@numbox-\dp\EQ@numbox)/2}%
+  \eq@typeset@leftnumber
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@LT{%
+  \dim@a\eq@firstht
+  \eq@typeset@leftnumber
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@LShifted{%
+  % place number
+  \copy\EQ@numbox \penalty\@M
+  \dim@a\eqlineskip
+  \if F\eq@frame\else
+     \setlength\dim@a{\eq@framesep+\eq@framewd}%
+  \fi
+  \kern\dim@a
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@RM{%
+  \setlength\dim@a{(\eq@vspan+\ht\EQ@numbox-\dp\EQ@numbox)/2}%
+  \eq@typeset@rightnumber
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@RB{%
+  % NOTE: is \eq@dp useful here
+  \setlength\dim@a{\eq@vspan-\ht\EQ@numbox-\dp\EQ@numbox}%
+  \eq@typeset@rightnumber
+  \eq@typeset@frame
+  \eq@typeset@equation
+}
+\def\eq@typeset@RShifted{%
+  % place number
+  \eq@typeset@frame
+  \eq@typeset@equation
+  \penalty\@M
+  \dim@a\eqlineskip
+  \if F\eq@frame\else
+    \addtolength\dim@a{\eq@framesep+\eq@framewd}%
+  \fi
+  \parskip\dim@a
+  \hbox to\hsize{\hfil\copy\EQ@numbox}\@@par%
+}
+\def\eq@C@setsides{%
+  % \dim@c = space for number, if any, and not shifted.
+  \dim@c\z@
+  \if\eq@hasNumber\if\eq@shiftnumber\else
+    \dim@c\eq@wdNum
+  \fi\fi
+  % \dim@e = space for condition(on right), if any and formula is only a single line.(to center nicely)
+  % but only count it as being right-aligned if we're not framing, since the frame must enclose it.
+  \dim@e\z@
+  \if F\eq@frame
+    \ifnum\eq@lines=\@ne\ifdim\eq@wdCond>\z@
+      \setlength\dim@e{\eq@wdCond+\conditionsep}%
+  \fi\fi\fi
+  % \dim@b = minimum needed on left max(totalleftmargin, left number space)
+  \dim@b\z@
+  \if L\eqnumside\ifdim\dim@b<\dim@c
+    \dim@b\dim@c
+  \fi\fi
+  \ifdim\dim@b<\@totalleftmargin
+    \dim@b\z@
+  \else
+    \addtolength\dim@b{-\@totalleftmargin}%
+  \fi
+  % \dim@d = minimum needed on right max(condition, right number space)
+  \dim@d\dim@e
+  \if R\eqnumside\ifdim\dim@d<\dim@c
+    \dim@d\dim@c
+  \fi\fi
+  % \dim@a = left margin; initially half available space
+  % \dim@c = right margin;  ditto
+  \setlength\dim@a{(\eq@linewidth-\eq@wdT+\dim@e+\@totalleftmargin)/2}%
+  \dim@c=\dim@a
+  % If too far to the left
+  \ifdim\dim@a<\dim@b
+     \addtolength\dim@c{\dim@a-\dim@b}%
+     \ifdim\dim@c<\z@\dim@c=\z@\fi
+     \dim@a=\dim@b
+  % Or if too far to the right
+  \else\ifdim\dim@c<\dim@d
+     \addtolength\dim@a{\dim@c-\dim@d}%
+     \ifdim\dim@a<\z@\dim@a=\z@\fi
+     \dim@c=\dim@d
+  \fi\fi
+  % Now, \dim@d,\dim@e is the left & right glue to center each line for centerlines
+  \setlength\dim@e{\eq@wdT-\eq@wdMin}\dim@d=\z@
+  \dim@d\z@
+  \if\eq@centerlines
+    \divide\dim@e2\relax
+    \dim@d=\dim@e
+  \fi
+  \setlength\leftskip{\dim@a\@plus\dim@d}%
+  \addtolength\dim@e{\dim@c}%
+  \setlength\rightskip{\z@\@plus\dim@e}%\@minus5\p@
+  % Special case: if framing, reduce the stretchiness of the formula (eg. condition)
+  % Or if we have a right number, FORCE space for it
+  \dim@b\z@
+  \if F\eq@frame\else
+    \dim@b\dim@c
+  \fi
+  \if\@And{\eq@hasNumber}{\@Not{\eq@shiftnumber}}%
+    \if R\eqnumside
+      \dim@c\eq@wdNum
+      \ifdim\dim@c>\dim@b
+        \dim@b\dim@c
+      \fi
+    \fi
+  \fi
+  % If either of those cases requires hard rightskip, move that part from glue.
+  \ifdim\dim@b>\z@
+    \addtolength\dim@e{-\dim@c}%
+    \rightskip\dim@b\@plus\dim@e%\@minus5\p@
+  \fi
+  % And peculiar further special case: in indented environs, width isn't where it would seem
+  \ifdim\eq@wdCond>\z@
+    \addtolength\rightskip{-\@totalleftmargin}%
+  \fi
+  \parfillskip\z@skip
+}
+\def\eq@I@setsides{%
+  \leftskip\mathindent
+  \if\eq@shiftnumber
+    \setlength\dim@a{\eq@linewidth-\eq@wdT-\mathindent}%
+    \ifdim\dim@a<\z@
+      \leftskip=\z@ % Or something minimal?
+    \fi
+  \fi
+  \dim@a=\z@
+  \setlength\dim@b{\eq@linewidth-\leftskip-\eq@wdMin}%
+  \if F\eq@frame
+  \else
+    \setlength\dim@a{\eq@linewidth-\leftskip-\eq@wdT}
+    \addtolength\dim@b{-\dim@a}%
+  \fi
+  % Or force the space for right number, if needed
+  \if\@And{\eq@hasNumber}{\@Not{\eq@shiftnumber}}%
+    \if R\eqnumside
+      \dim@c=\eq@wdNum
+      \if\dim@c>\dim@a
+        \addtolength\dim@b{-\dim@c}%
+        \dim@a=\dim@c
+      \fi
+    \fi
+  \fi
+  \setlength\rightskip{\dim@a\@plus\dim@b \@minus\hfuzz }%\hfuzz\z@
+  \parfillskip\z@skip
+}
+\def\eq@typeset@leftnumber{%
+  \setlength\skip@c{\dim@a-\ht\EQ@numbox}%
+  \vglue\skip@c% NON discardable
+  \copy\EQ@numbox \penalty\@M
+  \kern-\dim@a
+}
+\def\eq@typeset@rightnumber{%
+  \setlength\skip@c{\dim@a-\ht\EQ@numbox}%
+  \vglue\skip@c% NON discardable
+  \hbox to \hsize{\hfil\copy\EQ@numbox}\penalty\@M
+  \kern-\dim@a
+}
+\def\eq@typeset@equation{%
+  \nobreak
+  \eq@params\eq@parshape
+  \nointerlineskip\noindent
+  \add@grp@label
+  \eq@dump@box\unhbox\EQ@box\@@par
+}
+\newcommand\eqframe[2]{%
+  \begingroup
+  \fboxrule=\eq@framewd\relax\fboxsep=\eq@framesep\relax
+  \framebox{\z@rule\@height#2\kern#1}%
+  \endgroup
+}
+\def\eq@addframe{%
+  \hbox to\z@{%
+    \setlength\dim@a{\eq@framesep+\eq@framewd}%
+    \kern-\dim@a
+    \vbox to\z@{\kern-\dim@a
+      \hbox{\eqframe{\eq@wdT}{\eq@vspan}}%
+      \vss
+    }%
+    \hss
+  }%
+}
+\def\eq@typeset@frame{%
+  \if F\eq@frame\else
+   % Tricky: put before \noindent, so it's not affected by glue in \leftskip
+   \nobreak\nointerlineskip
+   \vbox to\eq@firstht{\moveright\leftskip\hbox to\z@{\eq@addframe\hss}\vss}%
+   \kern-\eq@firstht
+  \fi
+}
+\@saveprimitive\left\@@left
+\@saveprimitive\right\@@right
+\newcount\lr@level
+\ExplSyntaxOn
+\def\eq@left{%
+  \@ifnext .{\eq@nullleft}{\begingroup \let\math_delimiter:NNnNn \eq@left@a}%
+}
+\def\eq@right{%
+  \@ifnext .{\eq@nullright}{\begingroup \let \math_delimiter:NNnNn \eq@right@a}%
+}
+\def\eq@left@a#1#2#3#4#5#6{\endgroup
+  \@@left \math_delimiter:NNnNn #1#2{#3}#4{#5}\after@open}
+\def\eq@right@a#1#2#3#4#5#6{\endgroup
+  \@@right \math_delimiter:NNnNn #1#2{#3}#4{#5}\after@close \ss@scan{#1#2{#3}#4{#5}}%
+}
+\ExplSyntaxOff
+\def\eq@nullleft#1{\@@left#1\after@open}
+\def\eq@nullright#1{\@@right#1\after@close}
+\def\delim@reset{%
+  \let\after@open\relax \let\after@close\relax
+  \let\left\@@left \let\right\@@right
+}
+\@ifundefined{bBigg@}{% not defined
+  \let\big@size\p@
+  \def\big{\bBigg@{8.5}}\def\Big{\bBigg@{11.5}}%
+  \def\bigg{\bBigg@{14.5}}\def\Bigg{\bBigg@{17.5}}%
+  \def\biggg{\bBigg@{20.5}}\def\Biggg{\bBigg@{23.5}}%
+}{}
+\def\bBigg@#1#2{%
+  {\delim@reset
+   \left#2%
+   \vrule\@height#1\big@size\@width-\nulldelimiterspace
+   \right.
+  }%
+}
+\def\bigl#1{\mathopen\big{#1}\after@open}
+\def\Bigl#1{\mathopen\Big{#1}\after@open}
+\def\biggl#1{\mathopen\bigg{#1}\after@open}
+\def\Biggl#1{\mathopen\Bigg{#1}\after@open}
+\def\bigggl#1{\mathopen\biggg{#1}\after@open}
+\def\Bigggl#1{\mathopen\Biggg{#1}\after@open}
+
+\def\bigr#1{\mathclose\big{#1}\after@close}
+\def\Bigr#1{\mathclose\Big{#1}\after@close}
+\def\biggr#1{\mathclose\bigg{#1}\after@close}
+\def\Biggr#1{\mathclose\Bigg{#1}\after@close}
+\def\bigggr#1{\mathclose\biggg{#1}\after@close}
+\def\Bigggr#1{\mathclose\Biggg{#1}\after@close}
+
+%% No change needed, I think. [mjd,1998/12/04]
+%%\def\bigm{\mathrel\big}
+%%\def\Bigm{\mathrel\Big}
+%%\def\biggm{\mathrel\bigg}
+%%\def\Biggm{\mathrel\Bigg}
+%%\def\bigggm{\mathrel\biggg}
+%%\def\Bigggm{\mathrel\Biggg}
+\ExplSyntaxOn
+\cs_set:Npn \math_dsym_DeL:Nn #1#2{\math_bsym_DeL:Nn #1{#2}\after@open}
+\cs_set:Npn \math_dsym_DeR:Nn #1#2{\math_bsym_DeR:Nn #1{#2}\after@close}
+\cs_set:Npn \math_dsym_DeB:Nn #1#2{\math_bsym_DeB:Nn #1{#2}\after@bidir}
+
+%%%%%
+%%%%%\let\m@@DeL\m@DeL \let\m@@DeR\m@DeR \let\m@@DeB\m@DeB
+%%%%%\def\d@@DeL#1#2#3{%
+%%%%%  \delimiter"4\@xp\delim@a\csname sd@#1#2#3\endcsname #1#2#3 \after@open
+%%%%%}
+%%%%%\def\d@@DeR#1#2#3{%
+%%%%%  \delimiter"5\@xp\delim@a\csname sd@#1#2#3\endcsname #1#2#3 \after@close
+%%%%%}
+%%%%%\def\d@@DeB#1#2#3{%
+%%%%%  \delimiter"0\@xp\delim@a\csname sd@#1#2#3\endcsname #1#2#3 \after@bidir
+%%%%%}
+%%BRM: These weren't defined, but apparently should be.
+%%%%%%\let\m@@DeA\m@DeA\let\d@@DeA\m@DeA%
+\let\after@bidir\@empty
+\mathchardef\zero@bop=888 \relax
+\mathchardef\bop@incr=4444 \relax
+\def\after@open{%
+  \global\advance\lr@level\@ne
+  \prebinoppenalty\bop@incr \multiply\prebinoppenalty\lr@level
+  \advance\prebinoppenalty\zero@bop
+  \ifnum\eqbreakdepth<\lr@level
+     \cs_set_eq:NN \math_sym_Bin:Nn \math_isym_Bin:Nn %%%%%%\let\m@Bin\m@@Bin
+  \else
+    \eq@binoffset=\eqbinoffset
+    \advance\eq@binoffset\lr@level\eqdelimoffset plus1fill\relax
+    \def\dt@fill@cancel{\hskip\z@ minus1fill\relax}%
+  \fi
+  \penalty\@M % BRM: discourage break after an open fence?
+}
+\def\after@close{%
+  \global\advance\lr@level\m@ne
+  \prebinoppenalty\bop@incr \multiply\prebinoppenalty\lr@level
+  \advance\prebinoppenalty\zero@bop
+  \ifnum\eqbreakdepth<\lr@level
+  \else \cs_set_eq:NN \math_sym_Bin:Nn \math_dsym_Bin:Nn %%%%%%\let\m@Bin\d@@Bin
+  \fi
+  \ifnum\lr@level<\@ne \eq@binoffset=\eqbinoffset\relax \fi
+}
+
+\ExplSyntaxOff
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\let\subsup@flag=\count@
+\def\ss@delim@a@new#1#2#3#4#5{\xdef\right@delim@code{\number"#4#5}}
+\def\ss@scan#1{%
+  \begingroup
+    \ss@delim@a@new #1%
+  \endgroup
+  \subsup@flag\@M \afterassignment\ss@scan@a \let\@let@token=}
+\def\ss@scan@a{%
+  \let\breqn@next\ss@scan@b
+  \ifx\@let@token\sb \advance\subsup@flag\@ne\else
+  \ifx\@let@token\@@subscript \advance\subsup@flag\@ne\else
+  \ifx\@let@token\@@subscript@other \advance\subsup@flag\@ne\else
+  \ifx\@let@token\sp \advance\subsup@flag\tw@\else
+  \ifx\@let@token\@@superscript \advance\subsup@flag\tw@\else
+  \ifx\@let@token\@@superscript@other \advance\subsup@flag\tw@\else
+    \ss@finish
+    \let\breqn@next\relax
+  \fi\fi\fi\fi\fi\fi
+  \breqn@next\@let@token
+}
+\ExplSyntaxOn
+\def\ss@scan@b#1#2{#1{%
+  %%%%%\let\m@Bin\m@@Bin  \let\m@Rel\m@@Rel
+  \cs_set_eq:NN \math_sym_Bin:Nn \math_isym_Bin:Nn
+  \cs_set_eq:NN \math_sym_Rel:Nn \math_isym_Rel:Nn
+  #2}\afterassignment\ss@scan@a \let\@let@token=}%
+\ExplSyntaxOff
+\def\ss@finish{%
+  \@@vadjust{\penalty\thr@@}%
+  \penalty\right@delim@code \penalty-\subsup@flag \keep@glue
+}
+\def\eq@lrunpack{\setbox\z@\lastbox
+  \unskip \nointerlineskip
+  \noindent\unhbox\z@ \unskip
+  \subsup@flag-\lastpenalty \unpenalty
+  \xdef\right@delim@code{\number\lastpenalty}%
+  \unpenalty
+  \ifnum\subsup@flag>\@M
+    \advance\subsup@flag-\@M
+    \setbox\tw@\lastbox
+  \else \setbox\tw@\box\voidb@x
+  \fi
+  \setbox\z@\lastbox
+  \ifvoid\tw@ \unhbox\z@
+  \else \lrss@reattach % uses \subsup@flag, box\z@, box\tw@
+  \fi
+  \penalty-\@Mi\z@rule\@@par
+  \setbox\z@\lastbox \unskip\unpenalty
+%%{\showboxbreadth\maxdimen\showboxdepth99\showlists}%
+}
+\dimendef\sub@depth=8 \dimendef\sup@base=6
+\dimendef\prelim@sub@depth=4 \dimendef\prelim@sup@base=2
+\def\sym@xheight{\fontdimen5\textfont\tw@}
+\def\sup@base@one{\fontdimen13\textfont\tw@}
+\def\sub@base@one{\fontdimen16\textfont\tw@}
+\def\sub@base@two{\fontdimen17\textfont\tw@}
+\def\sup@drop{\fontdimen18\scriptfont\tw@}
+\def\sub@drop{\fontdimen19\scriptfont\tw@}
+\providecommand{\mathaxis}{\fontdimen22\textfont\tw@}
+\def\lrss@reattach{%
+  \begingroup
+  % "The TeXbook" Appendix G step 18:
+  \setlength\prelim@sup@base{\ht\z@-\sup@drop}%
+  \setlength\prelim@sub@depth{\dp\z@ +\sub@drop}%
+  \unhbox\z@
+  \ifcase\subsup@flag      % case 0: this can't happen
+  \or \lr@subscript   % case 1: subscript only
+  \or \lr@superscript % case 2: superscript only
+  \else \lr@subsup    % case 3: sub and superscript both
+  \fi
+  \endgroup
+}
+\def\lr@subscript{%
+  \sub@depth\sub@base@one
+  \ifdim\prelim@sub@depth>\sub@depth \sub@depth\prelim@sub@depth\fi
+  \setlength\dim@a{\ht\tw@  -.8\sym@xheight}%
+  \ifdim\dim@a>\sub@depth \sub@depth=\dim@a \fi
+  \twang@adjust\sub@depth
+  \lower\sub@depth\box\tw@
+}
+\def\lr@superscript{%
+  \sup@base\sup@base@one
+  \ifdim\prelim@sup@base>\sup@base \sup@base\prelim@sup@base\fi
+  \setlength\dim@a{\dp\tw@ -.25\sym@xheight}%
+  \ifdim\dim@a>\sup@base \sup@base\dim@a \fi
+  \twang@adjust\sup@base
+  \raise\sup@base\box\tw@
+}
+\def\lr@subsup{%
+  \sub@depth\sub@base@two
+  \ifdim\prelim@sub@depth>\sub@depth \sub@depth\prelim@sub@depth \fi
+  \twang@adjust\sub@depth
+  \lower\sub@depth\box\tw@
+}
+\def\twang@adjust#1{%
+  \begingroup
+    \@ifundefined{twang@\right@delim@code}{}{%
+      \setlength\dim@d{#1-\mathaxis}%
+      % put an upper limit on the adjustment
+      \ifdim\dim@d>1em \dim@d 1em \fi
+      \kern\csname twang@\right@delim@code\endcsname\dim@d
+    }%
+  \endgroup
+}
+\newcommand{\DeclareTwang}[2]{%
+  \ifcat.\@nx#1\begingroup
+    \lccode`\~=`#1\lowercase{\endgroup \DeclareTwang{~}}{#2}%
+  \else
+    \@xp\decl@twang#1?\@nil{#2}%
+  \fi
+}
+\def\decl@twang#1#2#3#4#5#6#7\@nil#8{%
+  \@namedef{twang@\number"#4#5#6}{#8}%
+}
+\DeclareTwang{\rangle}{-.4}
+\DeclareTwang{)}{-.33}
+\DeclareTwang{\rbrace}{-.25}
+\newenvironment{dseries}{\let\eq@hasNumber\@True \@optarg\@dseries{}}{}%
+\def\enddseries#1{\check@punct@or@qed}%
+\newenvironment{dseries*}{\let\eq@hasNumber\@False \@optarg\@dseries{}}{}%
+\@namedef{enddseries*}#1{\check@punct@or@qed}%
+\@namedef{end@dseries*}{\end@dseries}%
+\def\@dseries[#1]{%
+  \let\display@setup\dseries@display@setup
+  % Question: should this be the default for dseries???
+  \global\eq@wdCond\z@
+  \@dmath[layout={M},#1]%
+  \mathsurround\z@\@@math \penalty\@Mi
+  \let\endmath\ends@math
+  \def\premath{%
+    \ifdim\lastskip<.3em \unskip
+    \else\ifnum\lastpenalty<\@M \dquad\fi\fi
+}%
+  \def\postmath{\unpenalty\eq@addpunct \penalty\intermath@penalty \dquad \@ignoretrue}%
+\ignorespaces
+}
+\def\end@dseries{%
+  \unskip\unpenalty
+  \@@endmath \mathsurround\z@ \end@dmath
+}
+\def\eq@try@layout@M{%
+  \edef\@parshape{\parshape 1 0pt \the\eq@linewidth\relax}%
+  \eq@trial@b{M}{}%
+}
+\def\intermath@penalty{-221}%
+\newcommand\dquad{\hskip0.6em minus.3em}
+\newcommand\premath{}\newcommand\postmath{}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\renewenvironment{math}{%
+  \leavevmode \premath
+  \ifmmode\@badmath\else\@@math\fi
+}{%
+  \ifmmode\@@endmath\else\@badmath\fi
+}
+\def\ends@math#1{\check@punct@or@qed}
+\def\end@math{%
+  \ifmmode\@@endmath\else\@badmath\fi
+  \postmath
+}
+\let\eq@group\@False
+\let\grp@shiftnumber\@False
+\let\grp@hasNumber\@False
+\let\grp@eqs@numbered\@False
+\let\grp@aligned\@True
+\newenvironment{dgroup}{%
+  \let\grp@hasNumber\@True\@optarg\@dgroup{}%
+}{%
+  \end@dgroup
+}
+\newtoks\GRP@queue
+\newenvironment{dgroup*}{%
+  \let\grp@hasNumber\@False\@optarg\@dgroup{}%
+}{%
+  \end@dgroup
+}
+\def\@dgroup[#1]{%
+  \let\eq@group\@True \global\let\eq@GRP@first@dmath\@True
+  \global\GRP@queue\@emptytoks \global\setbox\GRP@box\box\voidb@x
+  \global\let\GRP@label\@empty
+  \global\grp@wdL\z@\global\grp@wdR\z@\global\grp@wdT\z@
+  \global\grp@linewidth\z@\global\grp@wdNum\z@
+  \global\let\grp@eqs@numbered\@False
+  \global\let\grp@aligned\@True
+  \global\let\grp@shiftnumber\@False
+  \eq@prelim
+  \setkeys{breqn}{#1}%
+  \if\grp@hasNumber \grp@setnumber \fi
+}
+\def\end@dgroup{%
+  \EQ@displayinfo \grp@finish
+  \if\grp@hasNumber\grp@resetnumber\fi
+}
+\@ifundefined{c@parentequation}{\newcounter{parentequation}}{}
+\global\let\GRP@label\@empty
+\def\add@grp@label{%
+  \ifx\@empty\GRP@label
+  \else \GRP@label \global\let\GRP@label\@empty
+  \fi
+}
+\def\grp@setnumber{%
+  \global\let\GRP@label\next@label \global\let\next@label\@empty
+  % Trick \eq@setnumber to doing our work for us.
+  \let\eq@hasNumber\@True
+  \eq@setnumber
+  \global\sbox\GRP@numbox{\unhbox\EQ@numbox}%
+  \grp@wdNum\eq@wdNum
+  \let\eq@hasNumber\@False
+  \let\eq@number\@empty
+  \eq@wdNum\z@
+  \protected@edef\theparentequation{\theequation}%
+  \setcounter{parentequation}{\value{equation}}%
+  \setcounter{equation}{0}%
+  \def\theequation{\theparentequation\alph{equation}}%
+}
+\def\grp@resetnumber{%
+  \setcounter{equation}{\value{parentequation}}%
+}
+\newbox\GRP@box
+\newbox\GRP@wholebox
+\def\grp@push{%
+  \global\GRP@queue\@xp\@xp\@xp{\@xp\the\@xp\GRP@queue
+    \@xp\@elt\@xp{\EQ@trial}%
+  }%
+  \global\setbox\GRP@box\vbox{%
+    \hbox{\box\EQ@box\box\EQ@copy\penalty\@ne\copy\EQ@numbox}%
+    \unvbox\GRP@box
+  }%
+  \EQ@trial
+  \if\eq@isIntertext\else
+    \ifdim\eq@wdL>\grp@wdL \global\grp@wdL\eq@wdL \fi
+    \ifdim\eq@wdT>\grp@wdT \global\grp@wdT\eq@wdT \fi
+    \setlength\dim@a{\eq@wdT-\eq@wdL}%
+    \ifdim\dim@a>\grp@wdR \global\grp@wdR\dim@a \fi
+    \ifdim\eq@linewidth>\grp@linewidth \global\grp@linewidth\eq@linewidth\fi
+    \if\eq@hasNumber
+       \global\let\grp@eqs@numbered\@True
+       \ifdim\eq@wdNum>\grp@wdNum\global\grp@wdNum\eq@wdNum\fi
+    \fi
+    \if\EQ@hasLHS\else\global\let\grp@aligned\@False\fi
+    \if D\eq@layout \global\let\grp@aligned\@False\fi % Layout D (usually) puts rel on 2nd line.
+    \if\eq@shiftnumber\global\let\grp@shiftnumber\@True\fi % One eq shifted forces all.
+  \fi
+}
+\def\grp@finish{%
+  \setlength\dim@a{\grp@wdL+\grp@wdR-4em}% Allowance for shrink?
+  \if\grp@aligned
+    \ifdim\dim@a>\grp@linewidth
+      \global\let\grp@aligned\@False
+    \fi
+  \fi
+  \addtolength\dim@a{\grp@wdNum }% Effective length
+  \if\grp@shiftnumber
+  \else
+    \if\@And{\grp@hasNumber}{\@Not\grp@eqs@numbered}
+      \ifdim\dim@a>\grp@linewidth
+        \global\let\grp@shiftnumber\@True
+      \fi
+    \fi
+  \fi
+  \if\grp@aligned
+     \global\grp@wdT\grp@wdL
+     \global\advance\grp@wdT\grp@wdR
+  \fi
+  \setbox\GRP@wholebox\vbox{%
+    \let\@elt\eqgrp@elt
+    \the\GRP@queue
+  }%
+  \global\let\eq@GRP@first@dmath\@True
+  \begingroup
+  \dmath@first@leftskip
+  \eq@topspace{\vskip\parskip}%
+  \endgroup
+  \if\@And{\grp@hasNumber}{\@Not{\grp@eqs@numbered}}%
+    \if\grp@shiftnumber
+      \copy\GRP@numbox \penalty\@M
+      \kern\eqlineskip
+    \else
+      \setlength\dim@a{%
+        (\ht\GRP@wholebox+\dp\GRP@wholebox+\ht\GRP@numbox-\dp\GRP@numbox)/2}%
+      \setlength\skip@c{\dim@a-\ht\GRP@numbox}%
+      \vglue\skip@c% NON discardable
+      \copy\GRP@numbox \penalty\@M
+      \kern-\dim@a
+      \kern-\abovedisplayskip % To cancel the topspace above the first eqn.
+    \fi
+  \fi
+  \unvbox\GRP@wholebox
+  \let\@elt\relax
+  \eq@botspace % not needed unless bottom number?
+}
+\def\eqgrp@elt#1{%
+  \global\setbox\GRP@box\vbox{%
+    \unvbox\GRP@box
+    \setbox\z@\lastbox
+    \setbox\tw@\hbox{\unhbox\z@
+      \ifnum\lastpenalty=\@ne
+      \else
+        \global\setbox\EQ@numbox\lastbox
+      \fi
+      \unpenalty
+      \global\setbox\EQ@copy\lastbox
+      \global\setbox\EQ@box\lastbox
+    }%
+  }%
+  \begingroup \let\eq@botspace\relax
+  #1%
+  \if\eq@isIntertext
+    \vskip\belowdisplayskip
+    \unvbox\EQ@copy
+  \else
+    \grp@override
+    \eq@finish
+  \fi
+  \endgroup
+}
+\def\grp@override{%
+  \def\eqindent{I}%
+  \setlength\dim@a{(\grp@linewidth-\grp@wdT)/2}%
+  \ifdim\dim@a<\z@\dim@a=\z@\fi
+  \dim@b\if L\eqnumside\grp@wdNum\else\z@\fi
+  \if\grp@shiftnumber\else
+    \ifdim\dim@b>\dim@a\dim@a\dim@b\fi
+  \fi
+  \if\grp@aligned
+    \addtolength\dim@a{\grp@wdL-\eq@wdL}%
+  \fi
+  \mathindent\dim@a
+  \ifdim\dim@b>\dim@a
+    \let\eq@shiftnumber\@True
+  \fi
+}
+\newskip\darraycolsep \darraycolsep 20pt plus1fil minus12pt
+\newcount\cur@row \newcount\cur@col
+\def\@tempa#1#2#3{%
+  \cur@col#1 \hfil
+  \setbox\z@\hbox{$\displaystyle####\m@th$}\@nx\col@box
+  \tabskip\z@skip
+  &\cur@col#2 \hfil
+  \setbox\z@\hbox{$\displaystyle\mathord{}####\mathord{}\m@th$}\@nx\col@box
+  \hfil
+  &\cur@col#3 \setbox\z@\hbox{$\displaystyle####\m@th$}\@nx\col@box
+  \hfil\tabskip\darraycolsep
+}
+\xdef\darray@preamble{%
+  \@tempa 123&\@tempa 456&\@tempa 789%
+  &\@tempa{10}{11}{12}&\@tempa{13}{14}{15}&\@tempa{16}{17}{18}%
+  \cr
+}
+\@ifundefined{Mathstrut@}{\let\Mathstrut@\strut}{}
+\def\darray@cr{\Mathstrut@\cr}
+\def\col@box{%
+  \unhbox\z@
+}
+\newenvironment{darray}{\@optarg\@darray{}}{}
+\def\@darray[#1]{%
+  \if\eq@group\else\eq@prelim\fi
+  \global\let\@preamble\@empty
+  \setkeys{breqn}{#1}%
+  \the\eqstyle \eq@setnumber
+  \ifx\@preamble\@empty \global\let\@preamble\darray@preamble \fi
+  \check@mathfonts
+  % \let\check@mathfonts\relax % tempting, but too risky
+  \@xp\let\csname\string\ \endcsname\darray@cr
+  \setbox\z@\vbox\bgroup
+  \everycr{\noalign{\global\advance\cur@row\@ne}}%
+  \tabskip\z@skip \cur@col\z@
+  \global\cur@row\z@
+  \penalty\@ne % flag for \dar@repack
+  \halign\@xp\bgroup\@preamble
+}
+\def\enddarray#1{\check@punct@or@qed}
+\def\end@darray{%
+  \ifvmode\else \eq@addpunct \Mathstrut@\fi\crcr \egroup
+  \dar@capture
+  \egroup
+}
+\def\dar@capture{%
+%% \showboxbreadth\maxdimen\showboxdepth99\showlists
+  \eq@wdL\z@ \eq@wdRmax\z@
+  \dar@repack
+}
+\def\dar@repack{%
+  \unpenalty
+  \setbox\tw@\lastbox
+  \global\setbox\EQ@box\hbox{%
+    \hbox{\unhcopy\tw@\unskip}\penalty-\@M \unhbox\EQ@box}%
+  \global\setbox\EQ@copy\hbox{%
+    \hbox{\unhbox\tw@\unskip}\penalty-\@M \unhbox\EQ@copy}%
+  \unskip
+  \ifcase\lastpenalty \else\@xp\@gobble\fi
+  \dar@repack
+}
+\newskip\conditionsep \conditionsep=10pt minus5pt%
+\newcommand{\conditionpunct}{,}
+\newcommand\condition{%
+  \begingroup\@tempswatrue
+    \@ifstar{\@tempswafalse \condition@a}{\condition@a}}
+\newcommand\condition@a[2][\conditionpunct]{%
+  \unpenalty\unskip\unpenalty\unskip % BRM Added
+  \hbox{#1}%
+  \penalty -201\relax\hbox{}% Penalty to allow breaks here.
+  \hskip\conditionsep
+  \setbox\z@\if@tempswa\hbox{#2}\else\hbox{$\textmath@setup #2$}\fi
+  \usebox\z@
+  \endgroup}
+\newenvironment{XXXXdsuspend}{%
+  \global\setbox\EQ@box\vbox\bgroup \@parboxrestore
+    \parshape 1 \displayindent \displaywidth\relax
+    \hsize=\columnwidth \noindent\ignorespaces
+}{%
+  \par\egroup
+  \global\setbox\GRP@box\vbox{%
+    \vbox{\copy\EQ@box\vtop{\unvbox\EQ@box}}%
+    \unvbox\GRP@box
+  }%
+  \global\GRP@queue\@xp{\the\GRP@queue
+    \@elt{\gdef\EQ@trial{}}%
+  }%
+}
+\newenvironment{dsuspend}{%
+  \global\setbox\EQ@box\vbox\bgroup \@parboxrestore
+    \parshape 1 \displayindent \displaywidth\relax
+    \hsize=\columnwidth \noindent\ignorespaces
+}{%
+  \par\egroup
+  \global\setbox\GRP@box\vbox{%
+    \hbox{\copy\EQ@box\vtop{\unvbox\EQ@box}}%
+    \unvbox\GRP@box
+  }%
+  \global\GRP@queue\@xp{\the\GRP@queue
+     \@elt{\let\eq@isIntertext\@True}%
+  }%
+}
+\newcommand\breqn@intertext[1]{\dsuspend#1\enddsuspend}
+\renewcommand{\*}{%
+  \if@display
+    \setbox\z@\hbox{\mathsurround\z@$\mkern\eq@binoffset$}%
+    \discretionary{}{%
+      \kern\the\wd\z@ \textchar\discretionarytimes
+    }{}%
+    \thinspace
+  \else
+    \discretionary{\thinspace\textchar\discretionarytimes}{}{}%
+  \fi
+}
+\newcommand{\discretionarytimes}{\times}
+\def\nref#1{\@xp\@nref\csname r@#1\endcsname}
+\def\@nref#1#2{\ifx\relax#1??\else \@xp\@firstoftwo#1\fi}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\endinput
+%%
+%% End of file `breqn.sty'.
diff --git a/Master/texmf-dist/tex/latex/breqn/flexisym.sty b/Master/texmf-dist/tex/latex/breqn/flexisym.sty
new file mode 100644
index 00000000000..13dcf8c1335
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/breqn/flexisym.sty
@@ -0,0 +1,425 @@
+%%
+%% This is file `flexisym.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% flexisym.dtx  (with options: `package')
+%% 
+%% This is a generated file.
+%% 
+%% Copyright (C) 1997-2003 by Michael J. Downes
+%% Copyright (C) 2007-2010 by Morten Hoegholm
+%% Copyright (C) 2007-2014 by Lars Madsen
+%% Copyright (C) 2007-2014 by Will Robertson
+%% 
+%% This work may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either
+%% version 1.3 of this license or (at your option) any later
+%% version. The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of
+%% LaTeX version 2005/12/01 or later.
+%% 
+%% This work has the LPPL maintenance status "maintained".
+%% 
+%% The Current Maintainer of this work is Will Robertson.
+%% 
+%% This work consists of the main source file flexisym.dtx
+%% and the derived files
+%%    flexisym.sty, flexisym.pdf, flexisym.ins,
+%%    cmbase.sym, mathpazo.sym, mathptmx.sym, msabm.sym.
+%% 
+\RequirePackage{expl3}[2009/08/05]
+\ProvidesExplPackage{flexisym}{2013/03/16}{0.97c}{Make math characters macros}
+
+\edef\do{%
+  \noexpand\AtEndOfPackage{%
+    \catcode\number`\"=\number\catcode`\"
+    \relax
+  }%
+}
+\do \let\do\relax
+\catcode`\"=12
+\let\@sym\@gobble
+\DeclareOption{robust}{%
+  \def\@sym#1{%
+    \ifx\protect\@typeset@protect \else\protect#1\exp_after:wN\use_none:nnnn\fi
+  }%
+}
+\def\mg@bin{2}% binary operators
+\def\mg@rel{2}% relations
+%%\def\mg@nre{B}% negated relations
+\def\mg@del{3}% delimiters
+%%\def\mg@arr{B}% arrows
+\def\mg@acc{0}% accents
+\def\mg@cop{3}% cumulative operators (sum, int)
+\def\mg@latin{1}% (Latin) letters
+\def\mg@greek{1}% (lowercase) Greek
+\def\mg@Greek{0}% (capital) Greek
+%%\def\mg@bflatin{4}% bold upright Latin letters ?
+%%\def\mg@Bbb{B}% blackboard bold
+\def\mg@cal{2}% script/calligraphic
+%%\def\mg@frak{5}% Fraktur letters
+\def\mg@digit{0}% decimal digits % 1 = oldstyle, 0 = capital
+\cs_set_protected:Nn \math_char:NNn {
+  \tex_mathchar:D \__int_eval:w " #1#2#3 \__int_eval_end:
+}
+\cs_set_protected:Nn \math_delimiter:NNnNn {
+  \tex_delimiter:D \__int_eval:w " #1#2#3#4#5 \__int_eval_end:
+}
+\cs_set_protected:Nn \math_radical:NnNn {
+  \tex_radical:D  \__int_eval:w " #1#2#3#4 \__int_eval_end:
+}
+\cs_set_protected:Nn \math_accent:NNnn {
+  \tex_mathaccent:D \__int_eval:w " #1 #2 #3 \__int_eval_end: {#4}
+}
+
+\let\sumlimits\displaylimits
+\let\intlimits\nolimits
+\let\namelimits\displaylimits
+\cs_new:Npn \math_bsym_Ord:Nn {\math_char:NNn 0 }% \m@Ord
+\cs_new:Npn \math_bsym_Var:Nn {\math_char:NNn 7 }% \m@Var
+\cs_new:Npn \math_bsym_Bin:Nn {\math_char:NNn 2 }% \m@Bin
+\cs_new:Npn \math_bsym_Rel:Nn {\math_char:NNn 3 }% \m@Bin
+\cs_new:Npn \math_bsym_Pun:Nn {\math_char:NNn 6 }% \m@Pun
+\cs_new:Nn  \math_bsym_COs:Nn { \math_char:NNn 1 #1 {#2} \sumlimits }% \m@COs
+\cs_new:Nn  \math_bsym_COi:Nn { \math_char:NNn 1 #1 {#2} \intlimits }% \m@COi
+\cs_new:Nn  \math_bsym_DeL:Nn { \math_sd_del_aux:Nnn 4 #1{#2} }% \m@DeL
+\cs_new:Nn  \math_bsym_DeR:Nn { \math_sd_del_aux:Nnn 5 #1{#2} }% \m@DeR
+\cs_new:Nn  \math_bsym_DeB:Nn { \math_sd_del_aux:Nnn 0 #1{#2} }% \m@DeB
+\cs_new:Nn  \math_bsym_DeA:Nn { \math_sd_del_aux:Nnn 3 #1{#2} }% \m@DeA
+\cs_new:Nn  \math_bsym_Rad:Nn { \math_sd_rad_aux:Nn #1{#2} }% \m@Rad
+\cs_new:Npn \math_bsym_Acc:Nn #1#2#3#4 {\math_accent:NNnn #1#2{#3}{#4}}% name is wrong
+
+\cs_set:Npn \math_sd_del_aux:Nnn #1#2#3{
+  \exp_args:Nf \math_sd_del_auxi:nN {\use:c{sd@#2#3}} #1 #2{#3}
+}
+\cs_set:Npn \math_sd_del_auxi:nN #1#2{ \math_delimiter:NNnNn #2 #1 }
+\cs_set:Npn \math_sd_rad_aux:Nn #1#2{
+  \exp_args:Nf \math_sd_rad_auxi:n {\use:c{sd@#1#2}} #1 {#2}
+}
+\cs_set:Npn \math_sd_rad_auxi:n #1{ \math_radical:NnNn #1 }
+
+\cs_set_protected:Npn \math_bcsym_Ord:Nn #1#2 { \@symtype \mathord   { \OrdSymbol {#2} } }%\@symOrd
+\cs_set_protected:Npn \math_bcsym_Var:Nn #1#2 { \@symtype \mathord   { \OrdSymbol {#2} } }%\@symVar
+\cs_set_protected:Npn \math_bcsym_Bin:Nn #1#2 { \@symtype \mathbin   { \OrdSymbol {#2} } }%\@symBin
+\cs_set_protected:Npn \math_bcsym_Rel:Nn #1#2 { \@symtype \mathrel   { \OrdSymbol {#2} } }%\@symRel
+\cs_set_protected:Npn \math_bcsym_Pun:Nn #1#2 { \@symtype \mathpunct { \OrdSymbol {#2} } }%\@symPun
+\cs_set_protected:Npn \math_bcsym_COi:Nn #1#2 { \@symtype \mathop    { \OrdSymbol {#2} \intlimits } }%\@symCOi
+\cs_set_protected:Npn \math_bcsym_COs:Nn #1#2 { \@symtype \mathop    { \OrdSymbol {#2} \sumlimits } }%\@symCOs
+\cs_set_protected:Npn \math_bcsym_DeL:Nn #1#2 { \@symtype \mathopen  { \OrdSymbol {#2} } }%\@symDeL
+\cs_set_protected:Npn \math_bcsym_DeR:Nn #1#2 { \@symtype \mathclose { \OrdSymbol {#2} } }%\@symDeR
+\cs_set_protected:Npn \math_bcsym_DeB:Nn #1#2 { \@symtype \mathord   { \OrdSymbol {#2} } }%\@symDeB
+\cs_set_protected:Npn \math_bcsym_DeA:Nn #1#2 { \@symtype \mathrel   { \OrdSymbol {#2} } }%\@symDeA
+\cs_set_protected:Npn \math_bcsym_Acc:Nn {\@sym}%\@symAcc FIX!
+\cs_set_protected:Npn \math_bcsym_Ope:Nn #1#2{\@symtype\mathopen{\OrdSymbol{#2}}}%\@symVar
+\cs_set_protected:Npn \math_bcsym_Clo:Nn #1#2{\@symtype\mathclose{\OrdSymbol{#2}}}%\@symVar
+\cs_set_protected:Npn \math_bcsym_Inn:Nn #1#2{\@symtype\mathinner{\OrdSymbol{#2}}}%\@symVar
+
+\let\@symtype\@firstofone
+\let\sym@global\global
+\cs_new:Npn \math_isym_Ord:Nn { \math_bsym_Ord:Nn }% \m@Ord
+\cs_new:Npn \math_isym_Var:Nn { \math_bsym_Var:Nn }% \m@Var
+\cs_new:Npn \math_isym_Bin:Nn { \math_bsym_Bin:Nn }% \m@Bin
+\cs_new:Npn \math_isym_Rel:Nn { \math_bsym_Rel:Nn }% \m@Bin
+\cs_new:Npn \math_isym_Pun:Nn { \math_bsym_Pun:Nn }% \m@Pun
+\cs_new:Npn \math_isym_COs:Nn { \math_bsym_COs:Nn }% \m@COs
+\cs_new:Npn \math_isym_COi:Nn { \math_bsym_COi:Nn }% \m@COi
+\cs_new:Npn \math_isym_DeL:Nn { \math_bsym_DeL:Nn }% \m@DeL
+\cs_new:Npn \math_isym_DeR:Nn { \math_bsym_DeR:Nn }% \m@DeR
+\cs_new:Npn \math_isym_DeB:Nn { \math_bsym_DeB:Nn }% \m@DeB
+\cs_new:Npn \math_isym_DeA:Nn { \math_bsym_DeA:Nn }% \m@DeA
+\cs_new:Npn \math_isym_Rad:Nn { \math_bsym_Rad:Nn }% \m@Rad
+\cs_new:Npn \math_isym_Acc:Nn { \math_bsym_DeL:Nn }% name is wrong
+\cs_set_protected:Npn \math_icsym_Ord:Nn { \math_bcsym_Ord:Nn }
+\cs_set_protected:Npn \math_icsym_Var:Nn { \math_bcsym_Var:Nn }
+\cs_set_protected:Npn \math_icsym_Bin:Nn { \math_bcsym_Bin:Nn }
+\cs_set_protected:Npn \math_icsym_Rel:Nn { \math_bcsym_Rel:Nn }
+\cs_set_protected:Npn \math_icsym_Pun:Nn { \math_bcsym_Pun:Nn }
+\cs_set_protected:Npn \math_icsym_COi:Nn { \math_bcsym_COi:Nn }
+\cs_set_protected:Npn \math_icsym_COs:Nn { \math_bcsym_COs:Nn }
+\cs_set_protected:Npn \math_icsym_DeL:Nn { \math_bcsym_DeL:Nn }
+\cs_set_protected:Npn \math_icsym_DeR:Nn { \math_bcsym_DeR:Nn }
+\cs_set_protected:Npn \math_icsym_DeB:Nn { \math_bcsym_DeB:Nn }
+\cs_set_protected:Npn \math_icsym_DeA:Nn { \math_bcsym_DeA:Nn }
+\cs_set_protected:Npn \math_icsym_Acc:Nn { \math_bcsym_Acc:Nn }
+\cs_set_protected:Npn \math_icsym_Ope:Nn { \math_bcsym_Ope:Nn }
+\cs_set_protected:Npn \math_icsym_Clo:Nn { \math_bcsym_Clo:Nn }
+\cs_set_protected:Npn \math_icsym_Inn:Nn { \math_bcsym_Inn:Nn }
+\cs_new:Npn \math_dsym_Ord:Nn { \math_bsym_Ord:Nn }
+\cs_new:Npn \math_dsym_Var:Nn { \math_bsym_Var:Nn }
+\cs_new:Npn \math_dsym_Bin:Nn { \math_bsym_Bin:Nn }
+\cs_new:Npn \math_dsym_Rel:Nn { \math_bsym_Rel:Nn }
+\cs_new:Npn \math_dsym_Pun:Nn { \math_bsym_Pun:Nn }
+\cs_new:Npn \math_dsym_COs:Nn { \math_bsym_COs:Nn }
+\cs_new:Npn \math_dsym_COi:Nn { \math_bsym_COi:Nn }
+\cs_new:Npn \math_dsym_DeL:Nn { \math_bsym_DeL:Nn }
+\cs_new:Npn \math_dsym_DeR:Nn { \math_bsym_DeR:Nn }
+\cs_new:Npn \math_dsym_DeB:Nn { \math_bsym_DeB:Nn }
+\cs_new:Npn \math_dsym_DeA:Nn { \math_bsym_DeA:Nn }
+\cs_new:Npn \math_dsym_Rad:Nn { \math_bsym_Rad:Nn }
+\cs_new:Npn \math_dsym_Acc:Nn { \math_bsym_DeL:Nn }
+\cs_set_protected:Npn \math_dcsym_Ord:Nn { \math_bcsym_Ord:Nn }
+\cs_set_protected:Npn \math_dcsym_Var:Nn { \math_bcsym_Var:Nn }
+\cs_set_protected:Npn \math_dcsym_Bin:Nn { \math_bcsym_Bin:Nn }
+\cs_set_protected:Npn \math_dcsym_Rel:Nn { \math_bcsym_Rel:Nn }
+\cs_set_protected:Npn \math_dcsym_Pun:Nn { \math_bcsym_Pun:Nn }
+\cs_set_protected:Npn \math_dcsym_COi:Nn { \math_bcsym_COi:Nn }
+\cs_set_protected:Npn \math_dcsym_COs:Nn { \math_bcsym_COs:Nn }
+\cs_set_protected:Npn \math_dcsym_DeL:Nn { \math_bcsym_DeL:Nn }
+\cs_set_protected:Npn \math_dcsym_DeR:Nn { \math_bcsym_DeR:Nn }
+\cs_set_protected:Npn \math_dcsym_DeB:Nn { \math_bcsym_DeB:Nn }
+\cs_set_protected:Npn \math_dcsym_DeA:Nn { \math_bcsym_DeA:Nn }
+\cs_set_protected:Npn \math_dcsym_Acc:Nn { \math_bcsym_Acc:Nn }
+\cs_set_protected:Npn \math_dcsym_Ope:Nn { \math_bcsym_Ope:Nn }
+\cs_set_protected:Npn \math_dcsym_Clo:Nn { \math_bcsym_Clo:Nn }
+\cs_set_protected:Npn \math_dcsym_Inn:Nn { \math_bcsym_Inn:Nn }
+\cs_set:Npn \math_setup_inline_symbols:
+ {
+  \cs_set_eq:NN \math_sym_Ord:Nn  \math_isym_Ord:Nn
+  \cs_set_eq:NN \math_sym_Var:Nn  \math_isym_Var:Nn
+  \cs_set_eq:NN \math_sym_Bin:Nn  \math_isym_Bin:Nn
+  \cs_set_eq:NN \math_sym_Rel:Nn  \math_isym_Rel:Nn
+  \cs_set_eq:NN \math_sym_Pun:Nn  \math_isym_Pun:Nn
+  \cs_set_eq:NN \math_sym_COs:Nn  \math_isym_COs:Nn
+  \cs_set_eq:NN \math_sym_COi:Nn  \math_isym_COi:Nn
+  \cs_set_eq:NN \math_sym_DeL:Nn  \math_isym_DeL:Nn
+  \cs_set_eq:NN \math_sym_DeR:Nn  \math_isym_DeR:Nn
+  \cs_set_eq:NN \math_sym_DeB:Nn  \math_isym_DeL:Nn
+  \cs_set_eq:NN \math_sym_DeA:Nn  \math_isym_DeA:Nn
+  \cs_set_eq:NN \math_sym_Rad:Nn  \math_isym_Rad:Nn
+  \cs_set_eq:NN \math_sym_Acc:Nn  \math_isym_DeL:Nn
+  \cs_set_eq:NN \math_csym_Ord:Nn \math_icsym_Ord:Nn
+  \cs_set_eq:NN \math_csym_Var:Nn \math_icsym_Var:Nn
+  \cs_set_eq:NN \math_csym_Bin:Nn \math_icsym_Bin:Nn
+  \cs_set_eq:NN \math_csym_Rel:Nn \math_icsym_Rel:Nn
+  \cs_set_eq:NN \math_csym_Pun:Nn \math_icsym_Pun:Nn
+  \cs_set_eq:NN \math_csym_COi:Nn \math_icsym_COi:Nn
+  \cs_set_eq:NN \math_csym_COs:Nn \math_icsym_COs:Nn
+  \cs_set_eq:NN \math_csym_DeL:Nn \math_icsym_DeL:Nn
+  \cs_set_eq:NN \math_csym_DeR:Nn \math_icsym_DeR:Nn
+  \cs_set_eq:NN \math_csym_DeB:Nn \math_icsym_DeB:Nn
+  \cs_set_eq:NN \math_csym_DeA:Nn \math_icsym_DeA:Nn
+  \cs_set_eq:NN \math_csym_Acc:Nn \math_icsym_Acc:Nn
+  \cs_set_eq:NN \math_csym_Ope:Nn \math_icsym_Ope:Nn
+  \cs_set_eq:NN \math_csym_Clo:Nn \math_icsym_Clo:Nn
+  \cs_set_eq:NN \math_csym_Inn:Nn \math_icsym_Inn:Nn
+ }
+
+\cs_set:Npn \math_setup_display_symbols:
+ {
+  \cs_set_eq:NN \math_sym_Ord:Nn  \math_dsym_Ord:Nn
+  \cs_set_eq:NN \math_sym_Var:Nn  \math_dsym_Var:Nn
+  \cs_set_eq:NN \math_sym_Bin:Nn  \math_dsym_Bin:Nn
+  \cs_set_eq:NN \math_sym_Rel:Nn  \math_dsym_Rel:Nn
+  \cs_set_eq:NN \math_sym_Pun:Nn  \math_dsym_Pun:Nn
+  \cs_set_eq:NN \math_sym_COs:Nn  \math_dsym_COs:Nn
+  \cs_set_eq:NN \math_sym_COi:Nn  \math_dsym_COi:Nn
+  \cs_set_eq:NN \math_sym_DeL:Nn  \math_dsym_DeL:Nn
+  \cs_set_eq:NN \math_sym_DeR:Nn  \math_dsym_DeR:Nn
+  \cs_set_eq:NN \math_sym_DeB:Nn  \math_dsym_DeL:Nn
+  \cs_set_eq:NN \math_sym_DeA:Nn  \math_dsym_DeA:Nn
+  \cs_set_eq:NN \math_sym_Rad:Nn  \math_dsym_Rad:Nn
+  \cs_set_eq:NN \math_sym_Acc:Nn  \math_dsym_DeL:Nn
+  \cs_set_eq:NN \math_csym_Ord:Nn \math_dcsym_Ord:Nn
+  \cs_set_eq:NN \math_csym_Var:Nn \math_dcsym_Var:Nn
+  \cs_set_eq:NN \math_csym_Bin:Nn \math_dcsym_Bin:Nn
+  \cs_set_eq:NN \math_csym_Rel:Nn \math_dcsym_Rel:Nn
+  \cs_set_eq:NN \math_csym_Pun:Nn \math_dcsym_Pun:Nn
+  \cs_set_eq:NN \math_csym_COi:Nn \math_dcsym_COi:Nn
+  \cs_set_eq:NN \math_csym_COs:Nn \math_dcsym_COs:Nn
+  \cs_set_eq:NN \math_csym_DeL:Nn \math_dcsym_DeL:Nn
+  \cs_set_eq:NN \math_csym_DeR:Nn \math_dcsym_DeR:Nn
+  \cs_set_eq:NN \math_csym_DeB:Nn \math_dcsym_DeB:Nn
+  \cs_set_eq:NN \math_csym_DeA:Nn \math_dcsym_DeA:Nn
+  \cs_set_eq:NN \math_csym_Acc:Nn \math_dcsym_Acc:Nn
+  \cs_set_eq:NN \math_csym_Ope:Nn \math_dcsym_Ope:Nn
+  \cs_set_eq:NN \math_csym_Clo:Nn \math_dcsym_Clo:Nn
+  \cs_set_eq:NN \math_csym_Inn:Nn \math_dcsym_Inn:Nn
+ }
+\math_setup_inline_symbols:
+\edef\tmp{\catcode\z@=\the\catcode\z@}
+\catcode\z@=\active
+\def\DeclareFlexSymbol#1#2#3#4{%
+  \begingroup
+  \cs_set_protected:Npx\@tempb{
+    \exp_not:N\@sym\exp_not:N#1\exp_not:c{math_sym_#2:Nn}
+        \exp_not:c{mg@#3}{#4}
+  }
+  \ifcat\exp_not:N#1\relax
+    \sym@global\let#1\@tempb
+  \else
+    \sym@global\mathcode`#1="8000\relax
+    \lccode\z@=`#1\relax
+    \lowercase{\sym@global\let^^@\@tempb}% zero char
+  \fi
+  \endgroup
+}
+\tmp % restore catcode
+\cs_set:Npn \DeclareFlexDelimiter #1#2#3#4#5#6{
+  \DeclareFlexSymbol{#1}{#2}{#3}{#4}
+  \cs_gset:cpx{sd@\use:c{mg@#3}#4}{\exp_not:c{mg@#5}{#6}}
+}
+
+\def\DeclareFlexCompoundSymbol#1#2#3{%
+  \exp_args:NNo \DeclareRobustCommand#1{\csname math_csym_#2:Nn\endcsname#1{#3}}%
+  \sym@global\let#1#1\relax
+}
+\DeclareRobustCommand\textchar{\text@char\textfont}
+\DeclareRobustCommand\scriptchar{\text@char\scriptfont}%
+\def\text@char@sym#1#2#3#4{% #3=fam, #4=slot
+  \begingroup
+    \cs_set_eq:NN \@sym \prg_do_nothing: % defense against infinite loops
+   \the\text@script@char#3%
+   \char"#4\endgroup
+}
+\edef\tmp{\catcode\z@=\the\catcode\z@}
+\catcode\z@=\active
+\def\text@char#1#2{\begingroup
+  \check@mathfonts
+  \cs_set_eq:NN \text@script@char #1
+  \cs_set_eq:NN \@sym \text@char@sym
+  \cs_set_eq:NN \@symtype \use_ii:nn
+  \cs_set_eq:NN \OrdSymbol \use:n
+  \cs_set_eq:NN \ifmmode \iftrue
+  \everymath{$\use_none:n}%$
+  \def\mkern{\muskip\z@}
+  \cs_set_eq:NN\mskip\mkern
+  \ifcat\relax\noexpand#2% true if #2 is a cs.
+    #2%
+  \else
+    \lccode\z@=\expandafter`\string#2\relax
+    \lowercase{^^@}%
+  \fi
+  \endgroup
+}
+\tmp % restore catcode
+\providecommand\textprime{}
+\DeclareRobustCommand\textprime{\leavevmode
+  \raise.8ex\hbox{\text@char\scriptfont\prime}%
+}
+\@ifundefined{resetMathstrut@}{}{%
+  \def\resetMathstrut@{%
+    \setbox\z@\hbox{\textchar\vert}%
+    \ht\Mathstrutbox@\ht\z@ \dp\Mathstrutbox@\dp\z@
+  }%
+}
+\@ifundefined{rightarrowfill@}{}{%
+  \def\rightarrowfill@#1{\m@th\setboxz@h{$#1\relbar$}\ht\z@\z@
+    $#1\copy\z@\mkern-7mu\cleaders
+    \hbox{$#1\mkern-2mu\box\z@\mkern-2mu$}\hfill
+    \mkern-6mu\OrdSymbol{\rightarrow}$}
+  \def\leftarrowfill@#1{\m@th\setboxz@h{$#1\relbar$}\ht\z@\z@
+    $#1\OrdSymbol{\leftarrow}\mkern-6mu\cleaders
+    \hbox{$#1\mkern-2mu\copy\z@\mkern-2mu$}\hfill
+    \mkern-7mu\box\z@$}
+  \def\leftrightarrowfill@#1{\m@th\setboxz@h{$#1\relbar$}\ht\z@\z@
+    $#1\OrdSymbol{\leftarrow}\mkern-6mu\cleaders
+    \hbox{$#1\mkern-2mu\box\z@\mkern-2mu$}\hfill
+    \mkern-6mu\OrdSymbol{\rightarrow}$}
+}
+\def\binrel@sym#1#2#3#4{%
+  \xdef\binrel@@##1{%
+    \ifx\math_sym_Ord:Nn #2 \math_csym_Ord:Nn
+    \else\ifx\math_sym_Var:Nn#2 \math_csym_Var:Nn
+    \else\ifx\math_sym_COs:Nn#2 \math_csym_COs:Nn
+    \else\ifx\math_sym_COi:Nn#2 \math_csym_COi:Nn
+    \else\ifx\math_sym_Bin:Nn#2 \math_csym_Bin:Nn
+    \else\ifx\math_sym_Rel:Nn#2 \math_csym_Rel:Nn
+    \else\ifx\math_sym_Pun:Nn#2 \math_csym_Pun:Nn
+    \else\exp_not:N\@symErr \fi\fi\fi\fi\fi\fi\fi
+  ?{\exp_not:N\OrdSymbol{##1}}}%
+}
+
+\def\binrel@a{%
+  \def\math_sym_Ord:Nn##1##2{\gdef\binrel@@####1{\math_sym_Ord:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_Var:Nn##1##2{\gdef\binrel@@####1{\math_sym_Var:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_COs:Nn##1##2{\gdef\binrel@@####1{\math_sym_COs:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_COi:Nn##1##2{\gdef\binrel@@####1{\math_sym_COi:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_Bin:Nn##1##2{\gdef\binrel@@####1{\math_sym_Bin:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_Rel:Nn##1##2{\gdef\binrel@@####1{\math_sym_Rel:Nn##1{\OrdSymbol{####1}}}}%
+  \def\math_sym_Pun:Nn##1##2{\gdef\binrel@@####1{\math_sym_Pun:Nn##1{\OrdSymbol{####1}}}}%
+}
+\def\binrel@#1{%
+  \setbox\z@\hbox{$%
+    \let\mathchoice\@gobblethree
+    \let\@sym\binrel@sym \binrel@a
+    #1$}%
+}
+\def\@symextension{sym}
+\newcommand\usesymbols[1]{%
+  \clist_map_variable:nNn{#1}\@tempb{%
+    \exp_args:No\@onefilewithoptions{\@tempb}[][]\@symextension
+  }%
+}
+\newcommand\ProvidesSymbols[1]{\ProvidesFile{#1.sym}}
+\DeclareRobustCommand{\not}[1]{\math_csym_Rel:Nn\not{\OrdSymbol{\notRel#1}}}
+\DeclareRobustCommand{\OrdSymbol}[1]{%
+  \begingroup\mathchars@reset#1\endgroup
+}
+\def\mathchars@reset{\let\@sym\@sym@ord \let\@symtype\@symtype@ord
+  \let\OrdSymbol\relax}
+\def\@symtype@ord#1#{}% a strange sort of \@gobble
+\def\@sym@ord#1#2{\exp_after:wN\@sym@ord@a\string#2\@nil}%
+\begingroup
+\lccode`\.=`\_ \lowercase{\endgroup
+\def\@sym@ord@a#1.#2.}#3#4\@nil#5#6{%
+  \if D#3
+     %\math_ord_delim_aux:Nn #5{#6}
+     \math_sd_del_aux:Nnn 0 #5{#6}% check if this works!
+  \else
+    \math_char:NNn 0 #5{#6}
+  \fi
+}
+\cs_set:Nn \math_ord_delim_aux:Nn {
+  \math_sd_aux:nn { \math_char:NNn 0 } {#1{#2}}
+}
+\@ifpackageloaded{amsmath}{%
+  \begingroup
+  \long\def\next#1\mathchardef\std@minus\mathcode`\-\relax
+                  \mathchardef\std@equal\mathcode`\=\relax#2\flexi@stop{%
+    \toks@{#1#2}%
+    \xdef\@begindocumenthook{\the\toks@}%
+  }%
+  \expandafter\next\@begindocumenthook\flexi@stop
+  \endgroup
+}{}
+\AtBeginDocument{%
+\def\newmcodes@{%
+  \mathcode `\'39\space
+  \mathcode `\*42\space
+  \mathcode `\."613A\space
+  \ifnum\mathcode`\-=45\space
+  \else
+    \ifnum\mathcode`\-=32768\space
+    \else
+      \mathchardef \std@minus \mathcode `\-\relax
+    \fi
+  \fi
+  \mathcode `\-45\space
+  \mathcode `\/47\space
+  \mathcode `\:"603A\space\relax
+}%
+}
+\DeclareOption{mathstyleoff}{%
+  \PassOptionsToPackage{noactivechars}{mathstyle}}
+\DeclareOption{cmbase}{\usesymbols{cmbase}}
+\DeclareOption{mathpazo}{\usesymbols{mathpazo}}
+\DeclareOption{mathptmx}{\usesymbols{mathptmx}}
+\ExecuteOptions{cmbase}
+\ProcessOptions\relax
+\renewcommand{\lnot}{\neg}
+\renewcommand{\land}{\wedge}
+\renewcommand{\lor}{\vee}
+\renewcommand{\le}{\leq}
+\renewcommand{\ge}{\geq}
+\renewcommand{\ne}{\neq}
+\renewcommand{\owns}{\ni}
+\renewcommand{\gets}{\leftarrow}
+\renewcommand{\to}{\rightarrow}
+\renewcommand{\|}{\Vert}
+\RequirePackage{mathstyle}
+\endinput
+%%
+%% End of file `flexisym.sty'.
diff --git a/Master/texmf-dist/tex/latex/breqn/mathstyle.sty b/Master/texmf-dist/tex/latex/breqn/mathstyle.sty
new file mode 100644
index 00000000000..ed91944417d
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/breqn/mathstyle.sty
@@ -0,0 +1,190 @@
+%%
+%% This is file `mathstyle.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% mathstyle.dtx  (with options: `package')
+%% 
+%% This is a generated file.
+%% 
+%% Copyright (C) 1997-2003 by Michael J. Downes
+%% Copyright (C) 2007-2011 by Morten Hoegholm et al
+%% Copyright (C) 2007-2014 by Lars Madsen
+%% Copyright (C) 2007-2014 by Will Robertson
+%% 
+%% This work may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either
+%% version 1.3 of this license or (at your option) any later
+%% version. The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of
+%% LaTeX version 2005/12/01 or later.
+%% 
+%% This work has the LPPL maintenance status "maintained".
+%% 
+%% The Current Maintainer of this work is Will Robertson.
+%% 
+%% This work consists of the main source file mathstyle.dtx
+%% and the derived files
+%%    mathstyle.sty, mathstyle.pdf, mathstyle.ins.
+%% 
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{mathstyle}
+  [2014/06/10 v0.90a Tracking mathstyle implicitly]
+\providecommand\@saveprimitive[2]{%
+  \begingroup
+  \edef\@tempa{\string#1}\edef\@tempb{\meaning#1}%
+  \ifx\@tempa\@tempb \global\let#2#1%
+  \else
+    \edef\@tempb{\meaning#2}%
+    \ifx\@tempa\@tempb
+    \else \@saveprimitive@a#1#2%
+    \fi
+  \fi
+  \endgroup
+}
+\providecommand\@saveprimitive@a[2]{%
+  \begingroup
+  \def\@tempb##1#1##2{\edef\@tempb{##2}\@car{}}%
+  \@tempb\nullfont{select font nullfont}%
+    \topmark{\string\topmark:}%
+    \firstmark{\string\firstmark:}%
+    \botmark{\string\botmark:}%
+    \splitfirstmark{\string\splitfirstmark:}%
+    \splitbotmark{\string\splitbotmark:}%
+    #1{\string#1}%
+    \@nil % for the \@car
+  \edef\@tempa{\expandafter\strip@prefix\meaning\@tempb}%
+  \edef\@tempb{\meaning#1}%
+  \ifx\@tempa\@tempb \global\let#2#1%
+  \else
+    \PackageError{mathstyle}%
+      {Unable to properly define \string#2; primitive
+      \noexpand#1no longer primitive}\@eha
+    \fi
+  \fi
+  \endgroup
+}
+\everydisplay=\expandafter{\the\everydisplay\chardef\mathstyle\z@}
+\chardef\mathstyle\@ne
+\@saveprimitive\displaystyle\@@displaystyle
+\@saveprimitive\textstyle\@@textstyle
+\@saveprimitive\scriptstyle\@@scriptstyle
+\@saveprimitive\scriptscriptstyle\@@scriptscriptstyle
+\@saveprimitive\mathchoice\@@mathchoice
+\@saveprimitive\over\@@over
+\@saveprimitive\atop\@@atop
+\@saveprimitive\above\@@above
+\@saveprimitive\overwithdelims\@@overwithdelims
+\@saveprimitive\atopwithdelims\@@atopwithdelims
+\@saveprimitive\abovewithdelims\@@abovewithdelims
+\DeclareRobustCommand{\displaystyle}{%
+  \@@displaystyle \chardef\mathstyle\z@}
+\DeclareRobustCommand{\textstyle}{%
+  \@@textstyle \chardef\mathstyle\@ne}
+\DeclareRobustCommand{\scriptstyle}{%
+  \@@scriptstyle \chardef\mathstyle\tw@}
+\DeclareRobustCommand{\scriptscriptstyle}{%
+  \@@scriptscriptstyle \chardef\mathstyle\thr@@}
+\begingroup \catcode`\^=7\relax \catcode`\_=8\relax % just in case
+\lowercase{\endgroup
+\let\@@superscript=^ \let\@@subscript=_
+}%
+\begingroup \catcode`\^=12\relax \catcode`\_=12\relax % just in case
+\lowercase{\endgroup
+\let\@@superscript@other=^ \let\@@subscript@other=_
+}%
+\def\subsupstyle{%
+  \ifnum\mathstyle<\tw@ \chardef\mathstyle\tw@
+  \else \chardef\mathstyle\thr@@
+  \fi
+}
+\let\mathsup=\@@superscript
+\let\mathsub=\@@subscript
+\def\sb#1{\mathsub{\protect\subsupstyle#1}}%
+\def\sp#1{\mathsup{\protect\subsupstyle#1}}%
+\def\mathchoice{%
+  \relax\ifcase\mathstyle
+    \expandafter\@firstoffour
+  \or
+    \expandafter\@secondoffour
+  \or
+    \expandafter\@thirdoffour
+  \else
+    \expandafter\@fourthoffour
+  \fi
+}
+\providecommand\@firstoffour[4]{#1}
+\providecommand\@secondoffour[4]{#2}
+\providecommand\@thirdoffour[4]{#3}
+\providecommand\@fourthoffour[4]{#4}
+\DeclareRobustCommand\genfrac[6]{%
+  {#1\fracstyle
+    {\begingroup #5\endgroup
+      \csname @@\ifx\maxdimen#4\maxdimen over\else above\fi
+        \if @#2@\else withdelims\fi\endcsname #2#3#4\relax
+     #6}%
+  }%
+}
+\renewcommand{\frac}{\genfrac{}{}{}{}}
+\providecommand{\dfrac}{}
+\providecommand{\tfrac}{}
+\renewcommand{\dfrac}{\genfrac\displaystyle{}{}{}}
+\renewcommand{\tfrac}{\genfrac\textstyle{}{}{}}
+\providecommand{\binom}{}
+\providecommand{\tbinom}{}
+\providecommand{\dbinom}{}
+\renewcommand{\binom}{\genfrac{}(){0pt}}
+\renewcommand{\dbinom}{\genfrac\displaystyle(){0pt}}
+\renewcommand{\tbinom}{\genfrac\textstyle(){0pt}}
+\def\fracstyle{\ifcase\mathstyle
+    \chardef\mathstyle=\@ne
+  \or
+    \chardef\mathstyle=\tw@
+  \else
+    \chardef\mathstyle=\thr@@
+  \fi
+}
+\def\currentmathstyle{%
+  \ifcase\mathstyle
+    \@@displaystyle
+  \or
+    \@@textstyle
+  \or
+    \@@scriptstyle
+  \or
+    \@@scriptscriptstyle
+  \fi}
+\DeclareOption{mathactivechars}{%
+ %  \catcode`\^=12\relax
+ %  \catcode`\_=12\relax
+\AtBeginDocument{\catcode`\^=12\relax \catcode`\_=12\relax}%
+}
+\DeclareOption{activechars}{%
+ %  \catcode`\^=13\relax
+ %  \catcode`\_=13\relax
+\AtBeginDocument{\catcode`\^=13\relax \catcode`\_=13\relax}%
+}
+\DeclareOption{noactivechars}{%
+ %  \catcode`\^=7\relax
+ %  \catcode`\_=8\relax
+\AtBeginDocument{\catcode`\^=7\relax \catcode`\_=8\relax}%
+}
+\ExecuteOptions{mathactivechars}
+\ProcessOptions\relax
+\ifnum\catcode`\^=13\relax
+  \let^=\sp \let_=\sb
+\else
+  \mathcode`\^="8000\relax
+  \mathcode`\_="8000\relax
+  \begingroup
+    \catcode`\^=\active
+    \catcode`\_=\active
+    \global\let^=\sp
+    \global\let_=\sb
+  \endgroup
+\fi
+\endinput
+%%
+%% End of file `mathstyle.sty'.