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From: gvr@cs.brown.edu (George V. Reilly)
Newsgroups: comp.text.tex
Subject: Re: Problem with LaTeX eqnarray...
Message-ID: <63713@brunix.UUCP>
Date: 5 Feb 91 06:58:59 GMT
References: <SULLIVAN.91Feb4162119@msor0.msor.exeter.ac.uk>
Sender: news@brunix.UUCP
Reply-To: gvr@cs.brown.edu (George V. Reilly)
Organization: Brown University Department of Computer Science
Lines: 26

In article <SULLIVAN.91Feb4162119@msor0.msor.exeter.ac.uk> sullivan@msor.exeter.ac.uk (Rob Sullivan) writes:
% I would be most grateful if someone could point out what is wrong with
% the following LaTeX file. It appears to produce a TeX 'weird' error.
% What should I do if I want aligned commutator brackets.
% 
% \documentstyle{article}
% \begin{document}
% text text text text
% \begin{eqnarray}
% [a,b]&=&0 \\
% [c,d]&=&0
% \end{eqnarray}
% text text text
% \end{document}

If you look at p. 151 of the LaTeX book, you'll see that \\ can take
an optional argument enclosed in [square brackets].  Either
enclose the [c,d] in braces
	[a,b]&=&0 \\
	{[c,d]}&=&0
or put an empty pair of braces after the \\
	[a,b]&=&0 \\{}
	[c,d]&=&0
________________
George V. Reilly   `InvisibleManiac'	gvr@cs.brown.edu   +1 (401) 863-7684
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