I would like to create a cases environment showing an angle bracket, instead of a curly one. I can't re-define the environment itself because I have to use the new environment together with the old one, that is I have to use 'curly cases' and 'angle cases' in the same document. Is there a package I could use?
[Tex/LaTex] Cases environment with angle brackets
amsmathbracketscases
Related Solutions
Well, I'd follow amsmath's suggestion to use aligned instead of split:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\text{left hand side} =
\begin{cases}
\!\begin{aligned}%[b]
& \text{a very long expression} \\
& + \text{that continues on the next line}
\end{aligned} & \text{1st condition} \\%[1ex]
\text{short expression} & \text{2nd condition}
\end{cases}
\]
\end{document}
Does this yield the output you want? (Note that the \! in front of aligned is needed since that environment adds a \, we have to cancel out.)
EDIT: If you want to achieve alignment and spacing as Niel suggests (@Niel: I would want that; good catch), then just remove the two % in the code.
\listfiles
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\begin{cases}
\epsilon & \exists k\left[i_{k}=0\right]\\
\text{LCS}\left(X_{1}\left(i_{1}-1\right),X_{2}\left(i_{2}- 1\right),\ldots,X_{n}
\left(i_{n}-1\right)\right)||\sigma_{1}^{i_{1}} \qquad
& \sigma_{1}^{i_{1}}=\sigma_{2}^{i_{2}}=\ldots=\sigma_{n}^{i_{n}}\\
\begin{aligned}[t]\arraycolsep=0pt
\max\{ &
\text{LCS}\big(X_{1}(i_1-1),X_2(i_{2}),\ldots,X_{n}(i_n)\big),\\ &
\text{LCS}\left(X_1(i_1),X_{2}(i_2-1),\ldots,X_n(i_n)\right),\\ &
\ldots, \\ &
\text{LCS}
\left(X_{1}\left(i_{1}\right),X_{2}\left(i_{2}\right),\ldots,X_{n}
\left(i_{n}-1\right)\right)\}
\end{aligned} & \text{else}
\end{cases}
\]
\end{document}
pages 18f and 56 of the Mathmode document show you the cases environemnt with linebreaks. More informations are only possible when you give an example of what you did.
Best Answer
The following code updates
casesto take an optional argument. The optional argument is used as the left delimiter instead of the traditional (default)\lbrace:It should function as expected, even if nested:
However, you may be better off using a regular
array. It depends on how you nest the content.