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+% \iffalse meta-comment
+%
+% Copyright 1993-2016
+% The LaTeX3 Project and any individual authors listed elsewhere
+% in this file.
+%
+% This file is part of the LaTeX base system.
+% -------------------------------------------
+%
+% It may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3c
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% https://www.latex-project.org/lppl.txt
+% and version 1.3c or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% This file has the LPPL maintenance status "maintained".
+%
+% The list of all files belonging to the LaTeX base distribution is
+% given in the file `manifest.txt'. See also `legal.txt' for additional
+% information.
+%
+% The list of derived (unpacked) files belonging to the distribution
+% and covered by LPPL is defined by the unpacking scripts (with
+% extension .ins) which are part of the distribution.
+%
+% \fi
+%
+% \iffalse
+%%% From File: ltthm.dtx
+%<*driver>
+% \fi
+\ProvidesFile{ltthm.dtx}
+ [2014/09/29 v1.0f LaTeX Kernel (Theorems)]
+% \iffalse
+\documentclass{ltxdoc}
+\GetFileInfo{ltthm.dtx}
+\title{\filename}
+\date{\filedate}
+ \author{%
+ Johannes Braams\and
+ David Carlisle\and
+ Alan Jeffrey\and
+ Leslie Lamport\and
+ Frank Mittelbach\and
+ Chris Rowley\and
+ Rainer Sch\"opf}
+
+\begin{document}
+ \MaintainedByLaTeXTeam{latex}
+ \maketitle
+ \DocInput{\filename}
+\end{document}
+%</driver>
+% \fi
+%
+%
+% \section{Theorem Environments}
+%
+%
+% The user creates his own theorem-like environments with the command\\
+% |\newtheorem|\marg{name}\marg{text}\oarg{counter} or\\
+% |\newtheorem|\marg{name}\oarg{oldname}\marg{text}\\
+% This defines the environment \meta{name} to be just as one would
+% expect a theorem environment to be, except that it prints \meta{text}
+% instead of ``Theorem''.
+%
+% If \meta{oldname} is given, then environments \meta{name} and
+% \meta{oldname} use the same counter, so using a \meta{name}
+% environment advances the number of the next \meta{name} environment,
+% and vice-versa.
+%
+% If \meta{counter} is given, then environment \meta{name} is numbered
+% within \meta{counter}.
+%
+% E.g., if \meta{counter} = |subsection|, then the first \meta{name} in
+% subsection 7.2 is numbered \meta{text} 7.2.1.
+%
+% The way \meta{name} environments are numbered can be changed by
+% redefining |\the|\meta{name}.
+%
+% \StopEventually{}
+%
+%
+% \changes{v1.0a}{1994/03/28}{Initial version, split from latex.dtx}
+% \changes{v1.0c}{1994/05/25}{Modify documentation}
+% \changes{v1.0f}{1995/10/10}{Make \cs{newtheorem} `only preamble'}
+% \changes{v1.0g}{1995/10/16}
+% {Revert to previous \cs{newtheorem} behaviour}
+%
+% \begin{oldcomments}
+%
+% DOCUMENT STYLE PARAMETERS
+%
+% \@thmcounter{COUNTER} : A command such that
+% \edef\theCOUNTER{\@thmcounter{COUNTER}}
+% defines \theCOUNTER to produce a number for a theorem environment.
+% The default is:
+% BEGIN \noexpand\arabic{COUNTER} END
+%
+% \@thmcountersep : A separator placed between a theorem number and
+% the number of the counter within which it is numbered.
+% E.g., to make the third theorem of section 7.2 be numbered
+% 7.2-3, \@thmcountersep should be \def'ed to '-'. Its
+% default is '.'.
+%
+% \@begintheorem{NAME}{NUMBER} : A command that begins a theorem
+% environment for a 'theorem' named 'NAME NUMBER' --
+% e.g., \@begintheorem{Lemma}{3.7} starts Lemma 3.7.
+%
+% \@opargbegintheorem{NAME}{NUMBER}{OPARG} :
+% A command that begins a theorem
+% environment for a 'theorem' named 'NAME NUMBER' with optional
+% argument OPARG -- e.g., \@begintheorem{Lemma}{3.7}{Jones}
+% starts `Lemma 3.7 (Jones):'.
+%
+% \@endtheorem : A command that ends a theorem environment.
+%
+% \newtheorem{NAME}{TEXT}[COUNTER] ==
+% BEGIN
+% if \NAME is definable
+% then \@definecounter{NAME}
+% if COUNTER present
+% then \@newctr{NAME}[COUNTER] fi
+% \theNAME == BEGIN \theCOUNTER \@thmcountersep
+% eval\@thmcounter{NAME} END
+% else \theNAME == BEGIN eval\@thmcounter{NAME} END
+% \NAME == \@thm{NAME}{TEXT}
+% \endNAME == \@endtheorem
+% else error
+% fi
+% END
+%
+% \newtheorem{NAME}[OLDNAME]{TEXT}==
+% BEGIN
+% if counter OLDNAME nonexistent
+% then ERROR
+% else
+% if \NAME is definable
+% then BEGIN
+% \theNAME == \theOLDNAME
+% \NAME == \@thm{OLDNAME}{TEXT}
+% \endNAME == \@endtheorem
+% END
+% else error
+% fi
+% fi
+% END
+%
+% \@thm{NAME}{TEXT} ==
+% BEGIN
+% \refstepcounter{NAME}
+% if next char = [
+% then \@ythm{NAME}{TEXT}
+% else \@xthm{NAME}{TEXT}
+% fi
+% END
+%
+% \@xthm{NAME}{TEXT} ==
+% BEGIN
+% \@begintheorem{TEXT}{\theNAME}
+% \ignorespaces
+% END
+%
+% \@ythm{NAME}{TEXT}[OPARG] ==
+% BEGIN
+% \@opargbegintheorem{TEXT}{\theNAME}{OPARG}
+% \ignorespaces
+% END
+% \end{oldcomments}
+%
+% \begin{macro}{\newtheorem}
+% |\newtheorem| ought really be allowed only in the preamble
+% Which would be good document style, and allow some main memory to be
+% saved by declaring these commands to be
+% |\@onlypreamble|. Unfortunately the \LaTeX\ book indicates that
+% |\newtheorem| may be used anywhere in the document\ldots
+% \begin{macrocode}
+%<*2ekernel>
+\def\newtheorem#1{%
+ \@ifnextchar[{\@othm{#1}}{\@nthm{#1}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@nthm}
+% \begin{macrocode}
+\def\@nthm#1#2{%
+ \@ifnextchar[{\@xnthm{#1}{#2}}{\@ynthm{#1}{#2}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@xnthm}
+%
+% 92/09/18 RmS: Changed |\@addtoreset| to |\@newctr| to produce error
+% message if counter |#3| does not exist (to be
+% consistent with behaviour of |\newcounter|)
+% \begin{macrocode}
+\def\@xnthm#1#2[#3]{%
+ \expandafter\@ifdefinable\csname #1\endcsname
+ {\@definecounter{#1}\@newctr{#1}[#3]%
+ \expandafter\xdef\csname the#1\endcsname{%
+ \expandafter\noexpand\csname the#3\endcsname \@thmcountersep
+ \@thmcounter{#1}}%
+ \global\@namedef{#1}{\@thm{#1}{#2}}%
+ \global\@namedef{end#1}{\@endtheorem}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@ynthm}
+% \begin{macrocode}
+\def\@ynthm#1#2{%
+ \expandafter\@ifdefinable\csname #1\endcsname
+ {\@definecounter{#1}%
+ \expandafter\xdef\csname the#1\endcsname{\@thmcounter{#1}}%
+ \global\@namedef{#1}{\@thm{#1}{#2}}%
+ \global\@namedef{end#1}{\@endtheorem}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@othm}
+% \changes{LaTeX2.09}{1992/01/10}
+% {(RmS) Check for existence of theorem environment}
+% \changes{LaTeX2.09}{1992/08/19}
+% {(RmS) Changed error message to complain about undefined
+% counter}
+% \changes{v1.0b}{1994/04/09}{Use standard counter error message (FMi)}
+% \changes{v1.0c}{1994/04/17}{Use new std counter error message (FMi)}
+% \begin{macrocode}
+\def\@othm#1[#2]#3{%
+ \@ifundefined{c@#2}{\@nocounterr{#2}}%
+ {\expandafter\@ifdefinable\csname #1\endcsname
+ {\global\@namedef{the#1}{\@nameuse{the#2}}%
+ \global\@namedef{#1}{\@thm{#2}{#3}}%
+ \global\@namedef{end#1}{\@endtheorem}}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@thm}
+% \begin{macrocode}
+\def\@thm#1#2{%
+ \refstepcounter{#1}%
+ \@ifnextchar[{\@ythm{#1}{#2}}{\@xthm{#1}{#2}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@xthm}
+% \begin{macro}{\@ythm}
+% \begin{macrocode}
+\def\@xthm#1#2{%
+ \@begintheorem{#2}{\csname the#1\endcsname}\ignorespaces}
+\def\@ythm#1#2[#3]{%
+ \@opargbegintheorem{#2}{\csname the#1\endcsname}{#3}\ignorespaces}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% Default values
+% \begin{macro}{\@thmcounter}
+% \begin{macro}{\@thmcountersep}
+% \begin{macrocode}
+\def\@thmcounter#1{\noexpand\arabic{#1}}
+\def\@thmcountersep{.}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\@begintheorem}
+% \begin{macro}{\@opargbegintheorem}
+% \begin{macro}{\@endtheorem}
+% \changes{LaTeX2.09}{1991/08/14}
+% {Moved \cs{itshape} after \cs{item} to make it work with
+% NFSS}
+% Providing theorem defaults.
+% \task{???}{add `reset@font?}
+% \begin{macrocode}
+\def\@begintheorem#1#2{\trivlist
+ \item[\hskip \labelsep{\bfseries #1\ #2}]\itshape}
+\def\@opargbegintheorem#1#2#3{\trivlist
+ \item[\hskip \labelsep{\bfseries #1\ #2\ (#3)}]\itshape}
+\def\@endtheorem{\endtrivlist}
+%</2ekernel>
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \Finale
+%
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