It is `amsmath' , not `amslatex' .
Org include amsmath defaultly .


2009/8/11 Carsten Dominik <carsten.dominik@gmail.com>

>
> On Aug 11, 2009, at 10:37 AM, waterloo wrote:
>
>  org-mode can not precess some LATEX environment .
>> Such as :
>> \begin{matrix}
>> \end{matrix}
>>
>> which is in amslatex.
>>
>
> Org-mode will handle these environments, but you must require the package
> in the header:
>
>
> #+LaTeX_HEADER: \usepackage{amslatex}
>
> Or add to org-export-latex-package-alist
>
> - Carsten
>
>