cursive letters inside equation

Question

I want to use cursive font inside an equation. I have defined a macro

\newenvironment{frcseries}{\fontfamily{frc}\selectfont}{}
\newcommand{\textfrc}[1]{{\frcseries#1}}

With this I get cursive fonts outside equation only. Could anyone please tell me how can I get cursive font inside equation? Thanks!

Answer 1

Your definition is not really the best even for text:

\DeclareRobustCommand{\frcshape}{\fontfamily{frc}\selectfont}
\DeclareTextFontCommand{\textfrc}{\frcshape}

Then \textfrc will be much safer.

For having it also in math mode, define

\newcommand{\mathfrc}[1]{\mbox{\frcshape #1}}

and so

$\mathfrc{Abc}$

would give the expected result (which, in my opinion, is quite bad).

Note. Don't use \textfrc in math mode if you load amsmath, because it would try loading font sizes that aren't available.