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How do I write the following in LaTeX:

enter image description here

  • Do you mean how to typeset it in LaTeX? – LaTeXereXeTaL Aug 12 at 0:20
  • @LaTeXereXeTaL, no, I mean how can I write above equation in Latex? I unable to find the name in google – aan Aug 12 at 0:26
  • Yes, that is what typesetting means. Check this answer, tex.stackexchange.com/a/551312/218142, which answers a very similar question. Does that help? – LaTeXereXeTaL Aug 12 at 0:28
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    The best way to achieve this is with the amsmath package, and then use a \begin{cases} environment. The linked answer by LaTeXereXeTaL uses the cases package, which in this instance I think amsmath is the more advisable package. – oliversm Aug 12 at 0:46
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5

As @Mico and @oliversm pointed out, there are two basic ways to do this.

Solution 1: using the cases package

\documentclass{article}
\usepackage{cases}

\begin{document}
\begin{numcases}{f(x)=}
  x, & \( x \geq 0\) \nonumber \\
  0, & \( x < 0 \)   \nonumber
\end{numcases}
\end{document}

Solution 2: using the cases environment of the amsmath package.

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[
f(x) = 
\begin{cases}
  x, & x \geq 0 \\
  0, & x < 0
\end{cases}
\]
\end{document}

Compiled output

Both give the same result, although the use of the cases package seems to typeset the result a bit lower on the page than using the amsmath cases environment. Personally, I like the former because you don't have to remember to go into display mode before. Choose the one you prefer.

| improve this answer | |
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    I'd lean more towards amsmath over cases. Having to wrap it in a math mode is a feature, not a bug, since it allows you to use the same technique whether it's in a plain display math or in a numbered equation. – Don Hosek Aug 12 at 3:10
  • @DonHosek I appreciate the advice! – LaTeXereXeTaL Aug 12 at 3:48
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Found it, using cases

\documentclass{article}
\usepackage{cases}

\begin{document}

   \begin{numcases}{f(x)=}
  x, \: \: \: \: x \geq 0                           \\
  0, \: \: \: \: x < 0             
\end{numcases} 


\end{document}
| improve this answer | |
  • @Mico, it said missing $ inserted – aan Aug 12 at 1:29
  • Your code does not reproduce the screenshot you posted earlier. – Mico Aug 12 at 1:29
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    Please give \documentclass{article} \usepackage{amsmath} \begin{document} $ f(x) = \begin{cases} x, & x \geq 0 \\ 0, & x < 0 \end{cases} $ \end{document} a shot. – Mico Aug 12 at 1:32

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