5

So I want to represent two results for a variable in math mode, and there is something that I don't know the name in English for, which is a big "{". What I want to do is the following:

\begin{equation}
 \pi(s) = {^{x if s = 5}_{y if s = 4}  
\end{equation}

But with a normal size and I don't think this is the correct way. So this line would occupy +- 2 lines instead of 1.

  • 1
    { is a left brace. – Bernard May 18 '19 at 19:02
9

I think you are looking for cases.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\pi(s)=\begin{cases}
x & \text{if $s = 5$}\\
y & \text{if $s = 4$}
\end{cases}
\]
\end{document}

enter image description here

  • what is the \[ and \] for? – Miguel Saraiva May 18 '19 at 19:04
  • @MiguelSaraiva \[ and \]? They are for unnumbered math mode, aren't they? What do you mean? – user156344 May 18 '19 at 19:04
  • Right, i'm used to using $$ or begin equation I forgot that was a thing. Thank you – Miguel Saraiva May 18 '19 at 19:05
  • @MiguelSaraiva Well, using equation is very okay, but please do not use $$! – user156344 May 18 '19 at 19:05
  • 1
    @MiguelSaraiva Ah, it is okay. Very okay :) – user156344 May 18 '19 at 19:08

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