# \cupdot gives “Undefined control sequence” with MikTek on Windows 7

I am using MikTek 2.9 on Windows 7. When I try to use \cupdot, in math mode, I get an "Undefined control sequence" error message. Is there a package that I need to include to use \cupdot?

You need to load MnSymbol

\documentclass{article}
\usepackage{MnSymbol}

\begin{document}
$\cupdot$
\end{document}

• That might not be such a good idea, as the font is not designed to be used with CM. – daleif Jan 8 '14 at 15:20
• That fixed the problem. The only caveat is that I had to remove mathpazo in order to avoid the message "\mathdollar already defined". That was not really a problem in my case. – OtagoHarbour Jan 8 '14 at 15:25
• @daleif I am aware of that but the OP did not provide any more information on the font. This is the easiest way to go and I would always try it first. – TomM Jan 8 '14 at 15:26
• Is CM a type of font? – OtagoHarbour Jan 8 '14 at 15:27
• @OtagoHarbour The command doesn't work with amsmath. There are a couple of threads which provide help in this case, for example: tex.stackexchange.com/questions/110976/… – TomM Jan 8 '14 at 15:35

the symbol you want is defined in the MnSymbol package.

however, loading that entire package can cause problems. instead, arrange to access just the symbol(s) you need selectively.

see the question Importing a Single Symbol From a Different Font

the particular font that contains \cupdot can be found in the MnSymbol documentation -- texdoc mnsymbol or view it from ctan.