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%D \module
%D [ file=m-oldmath,
%D version=2022.06.17,
%D title=Math,
%D subtitle=Fallback to old stuff,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is therefore copyrighted
%D by \PRAGMA. See mreadme.pdf for details.
%D For the \type {\over} die|-|hards (for this occasion I checked out Outlaw Vern's
%D updated review on that movie):
\unprotect
\mathgroupingmode \zerocount
\permanent\protected\def\eqalign#1% rather plain, is this used at all ...
{\dontleavehmode
\mskip\thinmuskip\vcenter\bgroup % \vcenter \s!class \mathwrappercode \bgroup
\mathsurround\zeropoint % \math_eqalign_set_defaults
\ialign
{\strut
\hfil
\mathbeginclass\mathordcode
\mathendclass \mathordcode
\startforceddisplaymath\aligncontent\stopforceddisplaymath
\aligntab
\mathbeginclass\mathordcode
\mathendclass \mathordcode
\startforceddisplaymath\aligncontent\stopforceddisplaymath
\hfil
\crcr
#1%
\crcr}%
\egroup\mskip\thinmuskip} % \egroup
%D Obsolete:
% \permanent\protected\def\displaylines#1%
% {\the\mathdisplayaligntweaks
% \tabskip\zeroskip
% \halign
% {\hbox to \displaywidth{%
% \normalstartimath\tabskip\zeroskip\everycr\emptytoks\hfil\displaystyle\alignmark\alignmark\hfil\normalstopimath}\crcr
% #1\crcr}}
%D no longer defined:
% \permanent\def\ialign % initialized \halign, to be used grouped!
% {\everycr\emptytoks
% \tabskip\zeroskip
% \halign}
%
% \permanent\def\oalign#1%
% {\leavevmode % plain tex uses this
% \vtop
% {\baselineskip\zeroskip
% \lineskip.25\exheight
% \ialign{\alignmark\alignmark\crcr#1\crcr}}}
%
% \permanent\def\ooalign % chars over each other
% {\lineskiplimit-\maxdimen
% \oalign}
%D More old plain stuff:
\permanent\protected\def\buildrel#1\over#2%
{\mathrel{\mathop{\kern\zeropoint#2}\limits^{#1}}}
\permanent\protected\def\math_openup
{\afterassignment\math_openup_indeed\scratchdimen}
\aliased\let\math_closeup\relax
\def\math_openup_indeed
{\enforced\permanent\protected\edef\math_closeup
{\lineskip \the\lineskip
\baselineskip \the\baselineskip
\lineskiplimit\the\lineskiplimit
\relax}%
\advanceby\lineskip \scratchdimen
\advanceby\baselineskip \scratchdimen
\advanceby\lineskiplimit\scratchdimen}
\permanent\protected\def\openup {\math_openup } % the low level ones are used elsewhere
\permanent\protected\def\closeup{\math_closeup} % the low level ones are used elsewhere
%D Who knows:
\permanent\protected\def\choose{\atopwithdelims()} % used in korean test file, has to go
\permanent\protected\def\brack {\atopwithdelims[]}
\permanent\protected\def\brace {\atopwithdelims\{\}}
%D We have better ways:
\permanent\protected\def\cases#1%
{\left\{%
\mskip\thinmuskip
\vcenter
{\normalbaselines
\mathsurround\zeropoint
\ialign{%
\normalstartimath\alignmark\alignmark\hfil\normalstopimath
\aligntab
\quad\alignmark\alignmark\hfil
\crcr
#1%
\crcr}}%
\right.}
\permanent\protected\def\matrix#1%
{\emptyhbox
\mskip\thinmuskip
\vcenter
{\normalbaselines
\mathsurround\zeropoint
\ialign{%
\hfil\normalstartimath\alignmark\alignmark\normalstopimath\hfil
\aligntab
\aligntab
\quad\hfil\normalstartimath\alignmark\alignmark\normalstopimath\hfil
\crcr
\mathstrut
\crcr
\noalign{\kern-\baselineskip}
#1\crcr
\mathstrut
\crcr
\noalign{\kern-\baselineskip}}}%
\mskip\thinmuskip}
\permanent\protected\def\pmatrix#1%
{\left(\matrix{#1}\right)}
\permanent\protected\def\root#1\of% #2%
{\rootradical{#1}} % {#2}
\protect
\endinput
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