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diff --git a/Master/texmf-dist/doc/latex/amsmath/subeqn.tex b/Master/texmf-dist/doc/latex/amsmath/subeqn.tex new file mode 100644 index 00000000000..d0fa7d9b023 --- /dev/null +++ b/Master/texmf-dist/doc/latex/amsmath/subeqn.tex @@ -0,0 +1,202 @@ +%%% ==================================================================== +%%% @LaTeX-file{ +%%% filename = "subeqn.tex", +%%% version = "1.2c", +%%% date = "1999/11/29", +%%% time = "14:49:29 EST", +%%% checksum = "29866 202 668 6426", +%%% author = "American Mathematical Society", +%%% copyright = "Copyright 1999 American Mathematical Society, +%%% all rights reserved. Copying of this file is +%%% authorized only if either: +%%% (1) you make absolutely no changes to your copy, +%%% including name; OR +%%% (2) if you do make changes, you first rename it +%%% to some other name.", +%%% address = "American Mathematical Society, +%%% Technical Support, +%%% Electronic Products and Services, +%%% P. O. Box 6248, +%%% Providence, RI 02940, +%%% USA", +%%% telephone = "401-455-4080 or (in the USA and Canada) +%%% 800-321-4AMS (321-4267)", +%%% FAX = "401-331-3842", +%%% email = "tech-support@ams.org (Internet)", +%%% supported = "yes", +%%% keywords = "latex, amslatex, ams-latex, amstex", +%%% abstract = "This is part of the AMS-\LaTeX{} distribution. +%%% It is a sample document illustrating the use of +%%% the subequations environment and the effect of +%%% the fleqn option.", +%%% docstring = "The checksum field above contains a CRC-16 +%%% checksum as the first value, followed by the +%%% equivalent of the standard UNIX wc (word +%%% count) utility output of lines, words, and +%%% characters. This is produced by Robert +%%% Solovay's checksum utility.", +%%% } +%%% ==================================================================== +\documentclass[fleqn]{article} + +\title{Test of subequations environment} +\author{mjd} + +\usepackage{amsmath} +\numberwithin{equation}{section} + +\newcommand{\env}[1]{{\normalfont\texttt{#1}}} + +\AtEndDocument{\multipasswarning} +\newcommand{\multipasswarning}{% + \clearpage + \typeout{% + **********************************************************************} + \typeout{% + Note: This document needs to run through LaTeX three times, instead of} + \typeout{% + the usual two, to resolve indirect cross-references.} + \typeout{% + **********************************************************************} +} + +\makeatletter +% Omit the warning message if three passes have been completed (on +% first pass \ref{check} is undefined and it is set to 0; on second +% pass \ref{check} is 0 and set to 1; on third pass it is 1). +\def\checkref{\begingroup + \@ifundefined{r@check}{\def\@currentlabel{0}}{\def\@currentlabel{1}}% + \ifnum1=0\expandafter\@firstoftwo\r@check\relax + \global\let\multipasswarning\relax + \fi + \label{check}% + \endgroup} +\makeatother + +\begin{document} +\section{Prime equation numbers} + +First an equation. +\begin{equation}\label{e:previous} +A=B +\end{equation} +That was equation \eqref{e:previous}. + +Then the same, with a prime on the number.\checkref +\begin{equation} +\tag{\ref{e:previous}$'$}\label{e:prevprime} +C=D +\end{equation} +And that was equation \eqref{e:prevprime}. + +Notice, by the way, that when a \verb"\ref" occurs inside a \verb"\tag", +and that \verb"\tag" is then \verb"\label"'d, a \verb"\ref" for the the +second \verb"\label" requires \emph{three} runs of \LaTeX{} in order to +get the proper value. (If you run through the logic of \LaTeX{}'s +cross-referencing mechanisms as they apply in this case, you will see +that this is necessary.) + +\section{Subnumbered equations} + +Here is a,b,c sub-numbering. +\begin{subequations} +\begin{eqnarray} +A&=&B\\ +D&=&C \label{e:middle}\\ +E&=&F +\end{eqnarray} +\end{subequations} +That was produced with the \env{eqnarray} environment; the middle line +was labeled as \eqref{e:middle}. + +An equation following the end of the \verb"subequations" environment +should revert to normal numbering: +\begin{equation}\label{e:check} +H<K +\end{equation} +A check on the labeling: that was equation~\eqref{e:check}. + +The sub-numbered equations can be spread out through the text, like +this: +\begin{subequations} +\begin{equation} +A=B +\end{equation} +The \verb"subequations" environment can span arbitrary text between +subsidiary equations. The only restriction is that if there are any +numbered equations inside the \verb"subequations" environment that break +out of the subequation numbering sequence, they would have to be handled +specially. +\begin{equation} +D=C \label{e:newmiddle} +\end{equation} +More arbitrary text. +\begin{equation} +E=F +\end{equation} +\end{subequations} +Label check: the middle one was \eqref{e:newmiddle} + +A final equation for a numbering check. +\begin{equation}\label{e:final} +G=H +\end{equation} +That equation was labeled as \eqref{e:final}. + +\section{Tests of \env{align}, \env{gather}, and other +AMS-\protect\LaTeX{} environments} + +The \env{align} environment: +\begin{subequations} +\begin{align} +\label{align:a}A+B&=B+A\\ +\label{align:b}C&=D+E\\ +\label{align:c}E&=F +\end{align} +\end{subequations} +Label check: that was \eqref{align:a}, \eqref{align:b}, and +\eqref{align:c}. + +The \env{align} environment again: +\begin{subequations} +\begin{align} +\label{xalign:a}A+B&=B& B&=B+A\\ +\label{xalign:b}C&=D+E& C\oplus D&=E\\ +\label{xalign:c}E&=F& E'&=F' +\end{align} +\end{subequations} +Label check: that was \eqref{xalign:a}, \eqref{xalign:b}, and +\eqref{xalign:c}. + +The \env{gather} environment. For the third line we refer to one of the +numbers in the first \env{align} structure. +\begin{subequations} +\begin{gather} +\label{gather:a}A+B=B\\ +\label{gather:b}C=D+E\\ +\tag{\ref{align:c}$'$}\label{gather:c}E=F +\end{gather} +\end{subequations} +Label check: that was \eqref{gather:a}, +\eqref{gather:b}, and +\eqref{gather:c}. + +The next \env{subequations} environment encompasses two separate +equations. A \env{split} environment: +\begin{subequations} +\begin{equation} +\label{split:x} +\begin{split} +A&=B+C+F\\ +&=G +\end{split} +\end{equation} +and a \env{multline} environment: +\begin{multline}\label{multline:x} +A[B]C[D]E[F]G[[H[I]J[K]L[M]N]]=\\ +H[I]J[K]L[M]N[O]P[Q]R[S]T[U]V[W]X[Y]Z +\end{multline} +\end{subequations} +Label check: That was \eqref{split:x} and \eqref{multline:x}. + +\end{document} |