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From: Taco Hoekwater <taco.hoekwater@wkap.nl>
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Subject: Re: ConTeXt: Math displays: eq. number and aligneq
Date: Sat, 27 Feb 1999 11:41:00 +0100 (W. Europe Standard Time)
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>>>>> "TB" == Tobias Burnus <burnus@gmx.de> writes:

 TB> Hi, what's the best methode to typeset an equation number for a
 TB> aligned equation?

 TB> I found a \formulenummer (ConTeXt manual (Dutch), edition 960122,
 TB> page 281), but this caused a lot of error messages with this few
 TB> lines (context-de, ConTeXt ver: 1999.2.1):

 TB> \platziereformel[-] \startformel \eqalignno{\overline P &=
 TB> \frac{1}{T}\int\limits_0^T U_0I_0\cos^2\omega t\,\dD t
 TB> \qquad\hbox{mit $T=2\pi$}&\cr &=\frac{1}{2}
 TB> U_0I_0.&{\formulenummer}\cr} \stopformel

 TB> \bye
 >> ! Undefined control sequence.  <argument> ...its _0^T U_0I_0\cos
 >> ^2\omega t\,\dD t \qquad \hbox {mit $T=2\p...

This is an error from \dD, unless I missed something.

Greetings, Taco