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2

The change.case$built-in function is described in the source (texk/bibtex-x/bibtex-4.c in TeX Live): * The |built_in| function change.case$ pops the top two (string) * literals; it changes the case of the second according to the * specifications of the first, as follows. (Note: The word `letters' in * the next sentence refers only to those at ...

4

Use the textcase package: \documentclass{article} \usepackage{amssymb} \usepackage[overload]{textcase} \pagestyle{headings} \begin{document} \section{Test $\mathfrak{g}_2$} \end{document} However, the best is to avoid the dreaded automatic uppercasing done by the standard classes, which is, in my opinion, the biggest flaw in their design. When headers ...

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LaTeX's standard classes use \MakeUppercase to convert the letters of section titles to uppercase. The conversion does not know about arguments, math, ... Workarounds: The letter "g" can be hidden inside a macro, e.g.: \documentclass{article} \usepackage{amssymb} \DeclareRobustCommand{\mathfrakg}{\mathfrak{g}} \pagestyle{headings} \begin{document} ...

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