Math & Science ⇒ piecewise function

[willy0625]

For the following piecewise function


f(x)= \left\{ \begin{array}{lr} 1 - e^{-(c\lambda)x}& \text{if }X\text{ is exponential} \\1-(1-p_{X})^{cx} &\text{if }X\text{ is geometric}. \end{array} \right

I am trying to align "if X is exponential" and "if X is geometric".

Cheers.

[gmedina]

Hi,

you could use the cases environment provided by the amsmath package:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation}
  f(x)=% 
  \begin{cases}
    1 - e^{-(c\lambda)x} &\text{if $X$ is exponential} \\
    1-(1-p_{X})^{cx} &\text{if $X$ is geometric}.
  \end{cases}
\end{equation}

\end{document}