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%%% ====================================================================
%%% @LaTeX-file{
%%% filename = "amsxtra.dtx",
%%% version = "1.2c",
%%% date = "1999/11/15",
%%% time = "14:15:41 EST",
%%% author = "American Mathematical Society",
%%% copyright = "Copyright 1995, 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",
%%% checksum = "41382 136 533 5124",
%%% email = "tech-support@ams.org (Internet)",
%%% codetable = "ISO/ASCII",
%%% keywords = "latex, accentedsymbol, fracwithdelims, sphat",
%%% supported = "yes",
%%% abstract = "This package contains some seldom-used commands
%%% ported from AMS-TeX in 1989.",
%%% 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.",
%%% }
%%% ====================================================================
%\iffalse
%<*driver>
\documentclass{amsdtx}
\begin{document}
\title{The \pkg{amsxtra} package}
\author{American Mathematical Society\\Michael Downes}
\date{Version \fileversion, \filedate}
\hDocInput{amsxtra.dtx}
\end{document}
%</driver>
%\fi
%
% \maketitle
%
% \MakeShortVerb\|
%
% \section{Introduction}
% The \pkg{amsxtra} package contains a few rarely used commands that
% were present in version 1.1 of the \pkg{amstex} package:
% \cn{fracwithdelims}, {accentedsymbol}, \cn{sphat}, \cn{spcheck},
% \cn{sptilde}, \cn{spdot}, \cn{spddot}, \cn{spdddot}, \cn{spbreve}.
% If any of these commands were used in existing documents, the
% \pkg{amsxtra} package provides a way to get them. But for 99\% of
% documents using the \pkg{amstex} package these commands are just
% wasted overhead.
%
% \StopEventually{}
%
% \begin{macrocode}
\ProvidesPackage{amsxtra}[1999/11/15 v1.2c]
% \end{macrocode}
% We need to ensure that either the \pkg{amstex} package or the
% \pkg{amsmath} package is loaded. This means we need something a
% little more complicated than \cn{RequirePackage}.
% \begin{macrocode}
\@ifpackageloaded{amstex}{}{%
\RequirePackage{amsmath}[1996/10/01 v1.2]}
% \end{macrocode}
%
% Superscripted accent characters.
% \begin{macrocode}
\def\sphat{^{\mathchoice{}{}%
{\,\,\smash[b]{\hbox{\lower4\ex@\hbox{$\m@th\widehat{\null}$}}}}%
{\,\smash[b]{\hbox{\lower3\ex@\hbox{$\m@th\hat{\null}$}}}}}}
\def\spcheck{^\vee}
\def\sptilde{^\sim}
\def\spdot{^{\hbox{\raise\ex@\hbox{\normalfont .}}}}
\def\spddot{^{\hbox{\raise\ex@\hbox{\normalfont ..}}}}
\def\spdddot{^{\hbox{\raise\ex@\hbox{\normalfont...}}}}
\def\spbreve{^{\!\smash[b]{\hbox{\lower4\ex@\hbox{\u{}}}}}}
% \end{macrocode}
%
% The \cn{fracwithdelims} command is skipped if the base package is
% \pkg{amsmath}; it is only needed if the base package is
% \pkg{amstex}.
% \begin{macrocode}
\@ifpackageloaded{amstex}{%
\def\fracwithdelims#1#2{\new@ifnextchar[{\fracwithdelims@#1#2}%
{\fracwithdelims@#1#2[\@empty]}}
\def\fracwithdelims@#1#2[#3]#4#5{\relax
\ifx\@empty#3{#4\overwithdelims#1#2#5}\else
{#4\abovewithdelims#1#2#3\relax#5}\fi}
}{}
% \end{macrocode}
%
% Perhaps |\accentedsymbol| should use |\newsavebox|, but I don't
% know of any compelling reason at the moment.[mjd,5-Sep-1994]
% |\accentedsymbol| can only produce a single size of
% the given symbol, so you'd need two different versions for main
% size and subscript size.
% \begin{macrocode}
\def\accentedsymbol#1#2{%
\expandafter\newbox
\csname\expandafter\@gobble\string#1@box\endcsname
\expandafter\setbox
\csname\expandafter\@gobble\string#1@box\endcsname
\hbox{$\m@th#2$}%
\newcommand{#1}{%
\expandafter\copy
\csname\expandafter\@gobble\string#1@box\endcsname{}}%
}
% \end{macrocode}
%
% Change the definition of \qc{\~} to automatically remove a
% preceding space as well as a following space, if present.
% \begin{macrocode}
\def~{\nobreakspace}
\DeclareRobustCommand{\nobreakspace}{\unskip\nobreak\ \ignorespaces}
% \end{macrocode}
%
% The usual \cs{endinput} to ensure that random garbage at the end of
% the file doesn't get copied by \fn{docstrip}.
% \begin{macrocode}
\endinput
% \end{macrocode}
%
% \CheckSum{113}
% \Finale
|
