# [OS X TeX] Using align with "or"

Eric van der Oord eric.vanderoord at gmail.com
Sun Apr 17 21:32:26 CEST 2011

Could :

\usepackage{amsmath}
$\begin{array}{lclcl} u=0& \text{or} & u+4=0 & \text{or} & u-4=0 \\ u=0& & u=-4 & & u=4 \\ \log x=0& & \log x=-4 & & \log x=4 \end{array}$

do ?

Eric

Le 17 avr. 2011 à 20:55, David Arnold a écrit :

> All,
>
> I have such a hard time figuring out how to use the align environment (or alternative) to align the solution of u(u+4)(u-4)=0 and the like.
>
> I want the first line to read:
>
> u=0     or     u+4=0     or     u-4=0
>
> And the second line to read, that is, I want the "or's" removed.
>
> u=0             u=-4                 u=4
>
> Ensuing lines are:
>
> \log x=0    \log x=-4           \log x=4
>
> Etc.
>
> I can never figure out how many &'s to use and where to put them so that this will work. Any suggestions?
>
> Thanks.
>
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