[OS X TeX] Using align with "or"
David Arnold
dwarnold45 at suddenlink.net
Mon Apr 18 00:35:23 CEST 2011
Bruno et al,
This is precisely what I needed. But now I think I also need an explanation. We have:
\begin{alignat}{5}
But the first row has 9 ampersands. I've stumbled into solutions like this on my own, but I just don't understand the use of the ampersands. Is this use of the ampersands explained in any documentation?
D.
P.S. Also, is there any way to spread out the output a bit?
D.
On Apr 17, 2011, at 12:56 PM, Bruno Voisin wrote:
> Le 17 avr. 2011 à 21:48, Lee D. Witt a écrit :
>> Have you tried "alignat"? You specify the number of "columns" to align. If you want to align n columns use 2n-1 &s
>>
> \begin{alignat}{5}
> 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{alignat}
>
> Bruno
>
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