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I need to use \simeq in an equation, but my code is not workin':

\begin{equation}\label{m-step}
P(t) \simeq {\sum_{g\in G} {\sum_{f\in F} P(t|f,g)
\end{equation}

Can you tell me why?

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Welcome to TeX.sx! You can highlight code by selecting it and pressing Ctrl + K, or clicking the button marked {} above the text field. –  Torbjørn T. Jan 11 '12 at 16:17

1 Answer 1

You have some unnecessary braces before the \sums. Remove these and it works fine.

\documentclass{article}
\begin{document}
\begin{equation}\label{m-step}
P(t) \simeq \sum_{g\in G} \sum_{f\in F} P(t|f,g)
\end{equation}
\end{document}
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You're right, I'm cracked up... thanx a lot! –  DavideChicco.it Jan 11 '12 at 16:29

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