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?
the symbol you want is defined in the
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.