Hi bartadam,
 Quote by bartadam
How do I do a wide check symbol in latex?
A wide hat or wide tilde is easy, it is simply \widehat{long expression} or \widetilde{longexpression}
There is no command for wide check, i.e an upside down hat.
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You can install the mathabx fonts found here:
http://www.ctan.org/tex-archive/fonts/mathabx/
which contain a widecheck. Once they are installed, you can use them with the regular \usepackage command:
Code:
\documentclass{article}
\usepackage{mathabx}
\begin{document}
\[ \widecheck{asdf} \]
\end{document}