[tex-eplain] multiple alignment within a math display

[Oleg Katsitadze]

On Fri, Jan 13, 2006 at 12:46:49PM +0100, Helmut Jarausch wrote:
> I am big fan of eplain for years.

:).

> \def\relieqalign#1{\,\vcenter{\openup1\jot\mathsurround=0pt
>     \ialign{\strut\hfil$\displaystyle{##}$ 
>                       &$\displaystyle{##}$\hfil 
>                       &$\displaystyle{{}##}$\hfil\crcr#1\crcr}}\,}

I usually do something like this (borrowed it from the
definition of \eqalign in plain TeX).  I think that
amstex.tex contains some macros for multiple alignments,
though I've never used amstex.

Best,
Oleg