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From: Christopher Creutzig <christopher@creutzig.de>
Newsgroups: gmane.comp.tex.context
Subject: Re: nath and \(start|stop)formula
Date: Mon, 15 Nov 2004 17:15:53 +0100
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Nikolai Weibull wrote:

> \usemodule[nath]
> \starttext
> $A = (B, C, D, E)$
> \placeformula
>   \startformula
>     A = (B, C, D, E)
>   \stopformula
> \stoptext
> 
> ! Undefined control sequence.
> l.6     A = (
>              B, C, D, E)
> 	     ? X

  Try \startnathequation ... \stopnathequation instead.  Or patch 
t-nath.tex for the same effect, I have (but this might have side-effects):

\let\nath!startformula\startformula
\let\nath!stopformula\stopformula

\def\startnathequation{%
   \begingroup
     \curr@cr@is@wall@cr
     \nath!startformula
       \startnatheq
         \hbox\bgroup
           \dmathon@
           \wall\mathopen{}%
}

\def\stopnathequation{%
           \return
           \dmathoff@
         \egroup
       \stopnatheq
     \nath!stopformula
   \endgroup
}

\let\startformula\startnathequation
\let\stopformula\stopnathequation


regards,
	Christopher Creutzig