Resetting mathcal font to default

Question

I am using the package mathptmx to change the text font to Times. However, the mathcal font is changed as well, which is think is a bit ugly.

How can I reset the mathcal font to its default?

Answer 1

Add the following line to your preamble:

\DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n}

Answer 2

You could just use \usepackage{newtxtext} from the newtx package, which loads a Times-like font for the text, but shouldn't change the math fonts.

Answer 3

I restored \boldmath to make sure that bold version is available.

\documentclass{article}

\let\saveboldmath\boldmath
\usepackage{mathptmx}
\let\boldmath\saveboldmath
\usepackage{bm}

\DeclareSymbolFont{cmsymbols}{OMS}{cmsy}{m}{n}
\SetSymbolFont{cmsymbols}{bold}{OMS}{cmsy}{b}{n}
\DeclareSymbolFontAlphabet{\mathcal}{cmsymbols}

\begin{document}

Times $\mathcal{ABCD}$ $\bm{\mathcal{ABCD}}$

\end{document}