[OS X TeX] brackets in \aligned

Morten Høgholm morten.hoegholm at gmail.com
Mon Jul 31 07:49:06 EDT 2006

On Mon, 31 Jul 2006 13:46:31 +0200, Bruce Kellogg <rbmjk at alltel.net> wrote:

Hi Bruce,

> This seems to be a bug. Using version 2.03 I type:
> \begin{equation*}
> \begin{aligned}
> [v](x) &=1, \\
> \{v\}(x) &=1,\\
> [v](x) &=1. \\
> \end{aligned}
> \end{equation*}
> and get 3 displayed equations. The 2nd and 3rd equations are ok,
> but the first equation is:
>    (x) = 1,
> This is using version 2.03. When I type
> \begin{equation*}
> [v](x) =1
> \end{equation*}
> the equation is correctly displayed, so I guess the problem is with  
> \aligned.

Version 2.03 of what? TeXShop? That is irrelevant in a case like this  
where it is the LaTeX output which is wrong. For something like this you  
should create a complete yet minimal example showing the problem.  
Something like this:

[v](x) &=1, \\
\{v\}(x) &=1,\\
[v](x) &=1. \\
Not OK:
[v](x) =1

\listfiles produces a list of files with version numbers at the end of the  
log file. I get this:

  *File List*
  article.cls    2005/09/16 v1.4f Standard LaTeX document class
   size10.clo    2005/09/16 v1.4f Standard LaTeX file (size option)
  amsmath.sty    2000/07/18 v2.13 AMS math features
  amstext.sty    2000/06/29 v2.01
   amsgen.sty    1999/11/30 v2.0
   amsbsy.sty    1999/11/29 v1.2d
   amsopn.sty    1999/12/14 v2.01 operator names

Very useful for spotting obsolete versions of packages.

> Is there anything I can do about it?

Substitute mathtools for amsmath. mathtools loads amsmath (including the  
options given to it) and besides adding various bells and whistles for  
mathematical typesetting it also fixes a few obscurities in amsmath. This  
one is explained in the manual.

who is obviously biased in this case being the author of mathtools ;-)
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