rm mh, replaced by breqn and mathtools

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-% \iffalse meta-comment
-%
-% Copyright (C) 1997-2003 by Michael J. Downes
-% Copyright (C) 2007-2008 by Morten Hoegholm
-%
-% 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".
-%
-% This Current Maintainer of this work is 
-% Lars Madsen, Will Robertson and Joseph Wright.
-%
-% This work consists of the main source file mathstyle.dtx
-% and the derived files
-%    mathstyle.sty, mathstyle.pdf, mathstyle.ins, mathstyle.drv.
-%
-% Distribution:
-%    CTAN:macros/latex/contrib/mh/mathstyle.dtx
-%    CTAN:macros/latex/contrib/mh/mathstyle.pdf
-%
-% Unpacking:
-%    (a) If mathstyle.ins is present:
-%           tex mathstyle.ins
-%    (b) Without mathstyle.ins:
-%           tex mathstyle.dtx
-%    (c) If you insist on using LaTeX
-%           latex \let\install=y\input{mathstyle.dtx}
-%        (quote the arguments according to the demands of your shell)
-%
-% Documentation:
-%    (a) If mathstyle.drv is present:
-%           latex mathstyle.drv
-%    (b) Without mathstyle.drv:
-%           latex mathstyle.dtx; ...
-%    The class ltxdoc loads the configuration file ltxdoc.cfg
-%    if available. Here you can specify further options, e.g.
-%    use A4 as paper format:
-%       \PassOptionsToClass{a4paper}{article}
-%
-%    Programm calls to get the documentation (example):
-%       pdflatex mathstyle.dtx
-%       makeindex -s gind.ist mathstyle.idx
-%       pdflatex mathstyle.dtx
-%       makeindex -s gind.ist mathstyle.idx
-%       pdflatex mathstyle.dtx
-%
-% Installation:
-%    TDS:tex/latex/mh/mathstyle.sty
-%    TDS:doc/latex/mh/mathstyle.pdf
-%    TDS:source/latex/mh/mathstyle.dtx
-%
-%<*ignore>
-\begingroup
-  \def\x{LaTeX2e}
-\expandafter\endgroup
-\ifcase 0\ifx\install y1\fi\expandafter
-         \ifx\csname processbatchFile\endcsname\relax\else1\fi
-         \ifx\fmtname\x\else 1\fi\relax
-\else\csname fi\endcsname
-%</ignore>
-%<*install>
-\input docstrip.tex
-\Msg{************************************************************************}
-\Msg{* Installation for package: mathstyle}
-\Msg{************************************************************************}
-
-\keepsilent
-\askforoverwritefalse
-
-\preamble
-
-This is a generated file.
-
-Copyright (C) 1997-2003 by Michael J. Downes
-Copyright (C) 2007-2011 by Morten Hoegholm et al
-
-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".
-
-This Current Maintainer of this work is
-Lars Madsen, Will Robertson and Joseph Wright.
-
-This work consists of the main source file mathstyle.dtx
-and the derived files
-   mathstyle.sty, mathstyle.pdf, mathstyle.ins, mathstyle.drv.
-
-\endpreamble
-
-\generate{%
-  \file{mathstyle.ins}{\from{mathstyle.dtx}{install}}%
-  \file{mathstyle.drv}{\from{mathstyle.dtx}{driver}}%
-  \usedir{tex/latex/mh}%
-  \file{mathstyle.sty}{\from{mathstyle.dtx}{package}}%
-}
-
-\obeyspaces
-\Msg{************************************************************************}
-\Msg{*}
-\Msg{* To finish the installation you have to move the following}
-\Msg{* file into a directory searched by TeX:}
-\Msg{*}
-\Msg{*     mathstyle.sty}
-\Msg{*}
-\Msg{* To produce the documentation run the file `mathstyle.drv'}
-\Msg{* through LaTeX.}
-\Msg{*}
-\Msg{* Happy TeXing!}
-\Msg{*}
-\Msg{************************************************************************}
-
-\endbatchfile
-%</install>
-%<*ignore>
-\fi
-%</ignore>
-%
-%<*driver>
-\ProvidesFile{mathstyle.drv}
-%</driver>
-%<package>\NeedsTeXFormat{LaTeX2e}
-%<package>\ProvidesPackage{mathstyle}
-%<*package|driver>
-  [2011/08/03 v0.90 Tracking mathstyle implicitly]
-%</package|driver>
-%<*driver>
-\documentclass{ltxdoc}
-\CodelineIndex
-\EnableCrossrefs
-\setcounter{IndexColumns}{2}
-\providecommand*\pkg[1]{\textsf{#1}}
-\begin{document}
-  \DocInput{mathstyle.dtx}
-\end{document}
-%</driver>
-% \fi
-%
-% \GetFileInfo{mathstyle.drv}
-% \title{The \textsf{mathstyle} package}
-% \date{\filedate\quad\fileversion}
-% \author{Morten H\o gholm \\Maintainers: \texttt{mh.ctan@gmail.com}}
-%
-%
-% \maketitle
-%
-% \part*{User's guide}
-%
-% This package exists for two reasons: 
-% \begin{itemize}
-% \item The primitive operations for creating a super- or subscript in
-%   \TeX\ work almost as if \verb|^| and \verb|_| are macros taking an
-%   argument. However, that is not quite the case, and
-%   some things that you'd expect to work don't (e.g., \verb|^\cong|) 
-%   whereas others which you'd think shouldn't work actually
-%   do (such as |^\mathsf{s}|). We do everyone a favor if it behaves
-%   consistently, i.e., if the superscript and subscript operations
-%   act as if they are macros taking exactly one argument.
-%
-% \item Because the \TeX\ math typesetting engine uses infix notation
-%   for fractions, one has to use \cs{mathchoice} or \cs{mathpalette}
-%   whenever trying to do anything requiring boxing or measuring
-%   math. This creates problems for loading fonts on demand as the
-%   font loading mechanism has to load fonts for all styles without
-%   even knowing if the font is going to be used. Getting the timing
-%   of \cs{mathchoice} right can be tricky as well. Since \LaTeX\ does
-%   not promote the primitive infix notation, this package keeps track
-%   of a current mathstyle parameter.
-% \end{itemize}
-% 
-% 
-% \section{Some usage tips}
-%
-% If you want to use this package with \pkg{amsmath}, it is important
-% \pkg{mathstyle} is loaded \emph{after} \pkg{amsmath}.
-%
-% The current mathstyle is stored in the variable \cs{mathstyle}. The
-% command \cs{currentmathstyle} can be used to switch to the mode
-% currently active. Below is shown how the macro \cs{mathrlap} from
-% \pkg{mathtools} is implemented without knowing about the current
-% mathstyle using \cs{mathpalette}.
-% \begin{verbatim}
-% \providecommand*\mathrlap[1][]{%
-%   \ifx\@empty#1\@empty
-%     \expandafter \mathpalette \expandafter \@mathrlap
-%   \else
-%     \expandafter \@mathrlap \expandafter #1%
-%   \fi}
-% \providecommand*\@mathrlap #1#2{{}\rlap{$\m@th#1{#2}$}}
-% \end{verbatim}
-% The same definition using \cs{currentmathstyle} from this package.
-% \begin{verbatim}
-% \providecommand*\mathrlap[2][]{%
-%   #1 {}\rlap{$\m@th \currentmathstyle {#2}$}}
-% \end{verbatim}
-%
-% \subsection{Package options}
-%
-% This package has one set of options affecting the \verb|_| and \verb|^| characters:
-%
-% \begin{itemize}
-% \item\verb|\usepackage[mathactivechars]{mathstyle}|
-%
-% This is the default behaviour. Here, \verb|_| and \verb|^| are made into harmless
-% characters in text mode and behave as expected (for entering sub/superscript) when
-% inside math mode.
-% Certain code that assumes the catcodes of these characters may get confused about
-% this; see below for a possible fix.
-%
-% \item\verb|\usepackage[activechars]{mathstyle}|
-%
-% With this option, \verb|_| and \verb|^| are made into active characters for
-% entering sub/superscript mode in all cases---therefore, in text mode they will
-% produce a regular error (`Missing \$ inserted') indicating they are being used
-% out of place.
-%
-% \item\verb|\usepackage[noactivechars]{mathstyle}|
-%
-% This is the option most like to solve any compatibility problems. Here,
-% \verb|_| and \verb|^| retain their regular catcodes at all times and behave
-% in their default fashion. \textbf{However}, certain other features of this
-% package (such as \cs{currentmathstyle} inside a subscript) will then fail
-% to work, so only use this option as a last resort.
-% \end{itemize}
-%
-% \StopEventually{}
-% \part*{Implementation}
-%
-%    \begin{macrocode}
-%<*package>
-%    \end{macrocode}
-%
-% \begin{macro}{\@saveprimitive}
-%   A straight copy from \pkg{breqn}, see implementation details
-%   there.  Of course, with a recent pdf\TeX\ (v1.40+), one can just
-%   use \cs{primitive} to get the original. We will implement that
-%   some day.
-%    \begin{macrocode}
-\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
-}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\everydisplay}
-% We need to keep track of whether we're in inline or display maths, and the only
-% way to do that is to add a switch inside \verb|\everydisplay|.
-% We act sensibly and preserve any of the previous contents of that token register
-% before adding our own code here.
-%    \begin{macrocode}
-\everydisplay=\expandafter{\the\everydisplay\chardef\mathstyle\z@}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\mathstyle}
-% A counter for the math style: 0--display, 1--text, 2--script, 3--scriptscript.
-% The logic is that display maths will explicitly
-% set \verb|\mathstyle| to zero (see above), so by default it is set to the
-% `text' maths style.
-%    \begin{macrocode}
-\chardef\mathstyle\@ne
-%    \end{macrocode}
-% \end{macro}
-%
-% Save the four style changing primitives, \cs{mathchoice} and the
-% fraction commands.
-%    \begin{macrocode}
-\@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
-%    \end{macrocode}
-% Then we redeclare the four style changing primitives.
-%    \begin{macrocode}
-\DeclareRobustCommand{\displaystyle}{%
-  \@@displaystyle \chardef\mathstyle\z@}
-\DeclareRobustCommand{\textstyle}{%
-  \@@textstyle \chardef\mathstyle\@ne}
-\DeclareRobustCommand{\scriptstyle}{%
-  \@@scriptstyle \chardef\mathstyle\tw@}
-\DeclareRobustCommand{\scriptscriptstyle}{%
-  \@@scriptscriptstyle \chardef\mathstyle\thr@@}
-%    \end{macrocode}
-% First we get the primitive operations. These should have been
-% control sequences in \TeX\ just like operations for begin math, end
-% math, begin display, end display.
-%    \begin{macrocode}
-\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=_
-}%
-%    \end{macrocode}
-% If we enter a sub- or superscript the \cs{mathstyle} must be
-% adjusted. Since all is happening in a group, we do not have to worry
-% about resetting.
-%    \begin{macrocode}
-\def\subsupstyle{%
-  \ifnum\mathstyle<\tw@ \chardef\mathstyle\tw@
-  \else \chardef\mathstyle\thr@@   
-  \fi
-}
-%    \end{macrocode}
-% Provide commands with meaningful names for the two primitives, cf.\
-% \cs{mathrel}.
-%    \begin{macrocode}
-\let\mathsup=\@@superscript
-\let\mathsub=\@@subscript
-%    \end{macrocode}
-% \cs{sb} and \cs{sp} are then defined as macros.
-%    \begin{macrocode}
-\def\sb#1{\mathsub{\protect\subsupstyle#1}}%
-\def\sp#1{\mathsup{\protect\subsupstyle#1}}%
-%    \end{macrocode}
-%
-% \begin{macro}{\mathchoice}
-% \cs{mathchoice} is now just a switch. Note that this redefinition
-% does not allow the arbitrary \meta{filler} of the \TeX\
-% primitive. Very rarely used anyway.
-%    \begin{macrocode}
-\def\mathchoice{%
-  \relax\ifcase\mathstyle
-    \expandafter\@firstoffour
-  \or
-    \expandafter\@secondoffour
-  \or
-    \expandafter\@thirdoffour
-  \else
-    \expandafter\@fourthoffour
-  \fi
-}
-%    \end{macrocode}
-% Helper macros.
-%    \begin{macrocode}
-\providecommand\@firstoffour[4]{#1}
-\providecommand\@secondoffour[4]{#2}
-\providecommand\@thirdoffour[4]{#3}
-\providecommand\@fourthoffour[4]{#4}
-%    \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\genfrac}
-% The fractions. Note that this uses the same names as in
-% \pkg{amsmath}. Much the same except here they call \cs{fracstyle}.
-%    \begin{macrocode}
-\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}%
-  }%
-}
-%    \end{macrocode}
-% \changes{v0.90}{2011/08/03}{\cs{fracstyle} must be called \emph{after}
-%   changing to the required style}
-% \end{macro}
-%
-%    \begin{macrocode}
-\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}}
-%    \end{macrocode}
-% The \cs{fracstyle} command is a switch to go one level down but no
-% further than three.
-%    \begin{macrocode}
-\def\fracstyle{\ifcase\mathstyle
-    \chardef\mathstyle=\@ne
-  \or 
-    \chardef\mathstyle=\tw@
-  \else 
-    \chardef\mathstyle=\thr@@
-  \fi
-}
-%    \end{macrocode}
-% The \cs{currentmathstyle} checks the value of \cs{mathstyle} and
-% switches to it so it is in essence the opposite of \cs{displaystyle}
-% and friends.
-%    \begin{macrocode}
-\def\currentmathstyle{%
-  \ifcase\mathstyle
-    \@@displaystyle
-  \or
-    \@@textstyle
-  \or
-    \@@scriptstyle
-  \or
-    \@@scriptscriptstyle
-  \fi}
-%    \end{macrocode}
-% Finally, we declare the package options.
-% \changes{v0.89}{2010/11/17}{Options should only change catcodes at
-% begin document, not straight away}
-%    \begin{macrocode}
-\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
-%    \end{macrocode}
-% WSPR: Set up the active behaviours: (this is set even in the
-% |noactivechars| case but they are never activated. no worries?)
-%    \begin{macrocode}
-\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
-%</package>
-%    \end{macrocode}
-%
-% \PrintIndex
-%
-% \Finale