[OS X TeX] Using align with "or"

[David Arnold]

No, the equal signs don't align.

D.

On Apr 17, 2011, at 12:32 PM, Eric van der Oord wrote:

> 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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> 
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