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From: Tobias Burnus <burnus@gmx.de>
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Subject: M-Math; \placeformula[-] and \displaylines cause problems
Date: Sat, 11 Nov 2000 19:51:55 +0100
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Hi,

After some investigational work I nailed it down to a m-math.tex
problem, which redefines \dodoplaatsformule and \dostartformula.

I have this (bigger than neccessary testcase):
-----------------<cut>--------------------------
\setupbodyfont[ams]
\usemodules[math]
\def\bfC{{\Bbb C}}
\definefont [rsfst][rsfs10 sa \currentfontscale]
\def\rsfs#1{\ifmmode\hbox\fi{\rsfst#1}}

%\placeformula[-] % -- doesn't work, why?
%\startformula % -- doesn't work, but $$ does, why?
$$
\displaylines{
  \langle\phi|\chi\rangle\in\bfC, \quad\rsfs H\cdot\!\!\rsfs H\in\bfC\cr
  \langle\phi|\chi\rangle=\langle\chi|\phi\rangle^*\cr}
$$
%\stopformula  % -- doesn't work, but $$ does, why?
\bye
-----------------<cut>--------------------------
If I use \start|stopformula instead of $$ I get an error
If I use \placeformula[-] I get an error.

If I don't use the m-math.tex module, I get no error either way.

I really miss a proper documentation of m-math.tex. (I have no idea how
to use \overrightarrow, but \overset works, so I don't mind).

Tobias

-- 
This above all: To thine own self be true / And it must follow as the
night
the day / Thou canst not then be false to any man