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%D \module
%D [ file=m-newmat,
%D version=2000.11.16,
%D title=\CONTEXT\ Math Module,
%D subtitle=AMS-like math extensions,
%D author={Taco Hoekwater \& Hans Hagen},
%D date=\currentdate,
%D copyright={Taco Hoekwater \& Hans Hagen}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See licen-en.pdf for
%C details.
\unprotect
%D Code has been integrated.
\protect \endinput
%D This module collects macros that \TEX\ users kind of expect
%D to be available when typesetting math. Most of them
%D originate in the \AMS\ macro packages. We have taken the
%D freedom to adapt them to \CONTEXT. This module is derived
%D from the \type {m-math} module by Taco Hoekwater (partially
%D derived from AMS math modules) and adapted|/|extended by
%D Hans Hagen.
%D \macros
%D {startsubarray,substack,startsmallmatrix}
%D
%D [HH] I wonder what these are supposed to do. An example
%D will be inserted later. Contrary to the original we
%D support an optional argument between either \type {{}} or
%D \type {[]}.
\def\startsubarray
{\doifnextcharelse\bgroup
\simplestartsubarray{\dosingleempty\complexstartsubarray}}
\def\complexstartsubarray[#1]%
{\simplestartsubarray{#1}}
\def\simplestartsubarray#1%
{\vcenter\bgroup
\baselineskip\fontdimen10 \scriptfont\plustwo
\advance\baselineskip\fontdimen12 \scriptfont\plustwo
\lineskip\plusthree\fontdimen8 \scriptfont\plusthree
\lineskiplimit\lineskip
\ialign\bgroup\ifx c#1\hfil\fi$\mathsurround\zeropoint\scriptstyle##$\hfil\crcr}
\def\stopsubarray
{\crcr\egroup
\egroup}
\def\startsubstack
{\doifnextcharelse\bgroup
\simplestartsubstack{\dosingleempty\complexstartsubstack}}
\def\complexstartsubstack[#1]%
{\simplestartsubstack{#1}}
\def\simplesubstack#1%
{\startsubarray[c]#1\stopsubarray}
\def\startsmallmatrix
{\null
\,%
\vcenter\bgroup
\baselineskip6\ex@
\lineskip1.5\ex@
\lineskiplimit\lineskip
\ialign\bgroup\hfil$\mathsurround\zeropoint\scriptstyle##$\hfil&&\thickspace\hfil
$\mathsurround\zeropoint\scriptstyle##$\hfil\crcr}
\def\stopsmallmatrix
{\crcr\egroup
\egroup
\,}
\protect \endinput
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