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I am new to LaTeX (sort of) and my fresh installation of TeXnicCenter with MikTeX doesn't recognize many symbols. For example: \nsubseteq, \subseteqq and \nsubseteqq (and the superset counterparts).

I've tried exporting both to PDF and DVI.

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3  
Are you loading the amssymb package? Add \usepackage{amssymb} to the preamble and see if the problem persists. –  Gonzalo Medina Nov 3 '11 at 13:22

1 Answer 1

up vote 5 down vote accepted

Load the package amssymb (as Gonzalo suggested) or mathabx:

\documentclass{article}
\usepackage{mathabx}
\begin{document}
\[
  \nsubseteq \nsubseteqq \subseteqq
\]
\end{document}

subset symbols

For other symbols, load the package which provides it. You can find it in The Comprehensive LaTeX Symbol List.

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Hurrah! Didn't see any of these mentioned anywhere, assumes these we on by default. I think amssymb is nicer. –  Ramon Snir Nov 3 '11 at 13:31

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