# How can I typeset a brace on the right-hand side of two equations?

How to obtein this on latex?

Thank you.

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Have you considered the rcases environment of the mathtools package? –  Mico May 9 at 14:42
no how to considered it ? –  Vrouvrou May 9 at 14:43
@Vrouvrou: A good starting point is reading the documentation of the package usually. –  Heiko Oberdiek May 9 at 14:49
I've posted an answer with two possible solutions, one using an array environment, the other an rcases environment. –  Mico May 9 at 14:53

Here are two methods for creating the output you're interested in. One involves the use of an array environment, and the other that of an rcases environment. The latter method requires less typing; however, it does require you to load the mathtools package -- which you may be doing anyway. Aside: If you use drcases instead of dcases, you could omit the two \displaystyle directives, for further savings in terms of typing effort.

\documentclass{article}
\usepackage{mathtools} % for 'rcases' environment
\setlength\textwidth{3in} % just for this example
\begin{document}
With \texttt{array} environment:

$\left.\begin{array}{ll} \displaystyle \int_\Omega f L(g)\,dx\\[2ex] \displaystyle \int_\Omega g L(f)\,dx \end{array}\right\}$

\bigskip
With \texttt{rcases} environment:

$\begin{rcases} \displaystyle \int_\Omega f L(g)\,dx\\ \displaystyle \int_\Omega g L(f)\,dx \end{rcases}$
\end{document}

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