[OS X TeX] Using align with "or"

[Alain Schremmer]

On Apr 18, 2011, at 10:54 AM, Vic Norton wrote:

>
> On Apr 17, 2011, at 9:39 PM, Alain Schremmer wrote:
>
>> But Companion two does not even mention \alignat. I just looked  
>> because I had been "doing it by hand", that is with a lot of  
>> \hspaces, and wanted to know if I had missed it.
>
> _More Math Into LaTeX_, 4th Edition, by list member George Gratzer,  
> devotes section 9.5.4 to "The alignat environment". Gratzer calls  
> alignat one of the most important alignment environments.

But Voisin says that align does what alignat does. But I would agree  
that align is "one of the most important alignment environments".

Regards
--schremmer