[Tugindia] cases with multiple tabs

Herbert Voss Herbert.Voss at alumni.TU-Berlin.DE
Wed Aug 20 22:41:42 CEST 2003


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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