[Tugindia] cases with multiple tabs

[Ashis Kumar Mal]

Thanks Herbert. For a prompt and very nice code.

I was wondering, why cases were not built
with multiple tabs, very often needed  to
align materials in right hand side. I mean
without using phantom etc. 



With regards,

Ashis Kumar Mal
Kharagpur

On Wed, 20 Aug 2003, Herbert Voss wrote:

> Ashis Kumar Mal schrieb:
> 
> > I tried to use cases environment,  but unable
> > to produce any output. I am in doubt wheather
> > cases can be nested. Moreover, in cases I can't 
> > use more than one tab(&).
> > I wish to  align "if" s and "<" s .
> 
> maybe this helps
> 
> Herbert
> 
> 
> \documentclass[12pt]{article}
> \usepackage{amsmath}
> \begin{document}
> \[
> z=
> \begin{cases}
>    f(x) \begin{cases}
>      +x & \text{if}\quad\frac{\hphantom{3}N}{4}  < x < \frac{3N}{4}\\
>      -2x & \text{if}\quad\frac{3N}{4} < x < N
>    \end{cases}\\
> 	    ~\\
>    f(y) \begin{cases}
>      -2x & \text{if}\quad\frac{\hphantom{3}N}{4}  < x < \frac{3N}{4}\\
>      +x  & \text{if}\quad\frac{3N}{4} < x < N
>    \end{cases}\\
> \end{cases}
> \]
> 
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