[OS X TeX] Using align with "or"
Ross Moore
ross.moore at mq.edu.au
Mon Apr 18 04:04:08 CEST 2011
On 18/04/2011, at 11:39 AM, Alain Schremmer wrote:
>> Try The LaTeX Companion 1st or 2nd editions.
>
> 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.
You're right. It isn't in the 2nd edition, but is in the 1st.
(I had mine packed away to take to a LaTeX Workshop that I'm
giving today, so didn't check before replying.)
I'd guess that the reason it was dropped is because you don't actually
need the 'at' nor the number.
Try this:
\begin{align}
u &=0 & \quad\text{or}\quad && u+4 &=0 & \quad\text{or}\quad && u-4 &=0 \\
u &=0 &&& u &=-4 &&& u &=4 \\
\log x &=0 &&& \log x &=-4 &&& \log x &=4
\end{align}
The {align} environment counts the number of alignments actually
used. But their treatment is the same: alternating right/left.
>
> Best regards
> --schremmer
Cheers,
Ross
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Ross Moore ross.moore at mq.edu.au
Mathematics Department office: E7A-419
Macquarie University tel: +61 (0)2 9850 8955
Sydney, Australia 2109 fax: +61 (0)2 9850 8114
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