# Section titles in caps give problems with math mode in it

I use the style file mn2e that makes section titles appear in boldface and in all caps. Which is fine, but not for the formula within such a title.

Example:

\section{The derivative \$dI/dR\$}

gives as output

APPENDIX B: THE DERIVATIVE DI/DR

So the math mode remains, which is good, but now also the derivation "d" has been capitalized, which obviously shouldn't be the case.

This seems like a pretty standard problem, but I couldn't find the answer here, so sorry if this is a previously answered question.

Any help is greatly appreciated.

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Welcome to TeX.SX! What document class (or style file) are you using? – egreg Feb 7 '14 at 13:13
One should know at least which class/style file is used in order to help. – Bernard Feb 7 '14 at 13:26
this might reasonably be reported as a bug to the author of the offending document class or package. – barbara beeton Feb 7 '14 at 14:06