[texhax] \bigcupdot / \bigdotcup in LaTeX

Soeren D. Schulze soeren.d.schulze at gmx.de
Mon Jan 2 09:11:42 CET 2012

I've been wondering how to use the \bigdotcup symbol without the
MnSymbol package.

My current hack is not too beautiful, but it works at least in
\displaystyle:

% Uhhh....
\newcommand{\bigdotcup}{\ensuremath{\mathop{\makebox[-2pt]{\hspace{16pt}{$$\cdot$$}}\bigcup}}}

Problem: it absolutely does not work in \textstyle (the \cdot is
misaligned).
Is there some command to define it separately for \displaystyle and
\textstyle?  Or is there a hopefully better definition for the symbol?