How to prevent MnSymbols from aliasing \emptyset=\varnothing=\diameter?

Question

I'd really like to keep the default \emptyset. I also use MnSymbol. But MnSymbols aliases \emptyset and \varnothing to \diameter.

How can I prevent that from happening? Could I save \emptyset previously to calling \usepackage{MnSymbol} and restore it later on?

Answer 1

please provide complete examples! And the package name is MnSymbol

\documentclass{article}

\DeclareSymbolFont{Symbols}{OMS}{cmsy}{m}{n}
\DeclareMathSymbol{\Emptyset}{\mathord}{Symbols}{"3B}

\usepackage{MnSymbol}

\begin{document}

$\Emptyset$ $\emptyset$

\end{document}

Answer 2

For the sake of completeness, I believe you could just explicitly change the empty set back to the cm empty set:

\renewcommand{\emptyset}{\font\cmsy = cmsy10 at 10pt
 \hbox{\cmsy \char 59}
}

I think the other solutions are better, however.