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I want to write capital \Sigma in bold mathrm. I tried \boldsymbol{\mathrm{\Sigma}} but seems like this does not work. Any help in this regard will be highly appreciated. Thanks

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If not obsolete now (there might be new ways for this), the bm package is your friend :) Use as \bm{\Sigma}. – percusse Nov 30 '11 at 3:56
What do you mean it does not seem to work? – Werner Nov 30 '11 at 4:05
@perusse: Thanks for your comment. \bm{\Sigma} is what I was looking for. Would you mind to include your comment as answer? Thanks – MYaseen208 Nov 30 '11 at 4:14
Look at the difference in the formatting of \Sigma in the following: \documentclass{article}\usepackage{amsmath}\begin{document}$\Sigma~\boldmath{\S‌​igma}~\boldmath{\mathrm{\Sigma}}$\end{document} If this still produces the incorrect formatting of \Sigma, then you need to update your distribution; at least your AMS LaTeX bundle. – Werner Nov 30 '11 at 4:37
since you're using amsmath, you don't have to load amsbsy -- it's loaded automatically by amsmath. also, the default \Sigma is upright, so \mathrm doesn't do anything (unless perhaps you're loading a package that changes the style to sloped, but i didn't see such a package in your list). finally, \boldmath has to be loaded outside of math mode, and a warning is emitted if it's found inside. so the "best" solution (with amsmath) is simply \boldsymbol{\Sigma}. – barbara beeton Nov 30 '11 at 14:01
up vote 5 down vote accepted

You can access boldface math symbols with the bm package. As usual, it is always beneficiary to go through the manual for some subtle features.

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