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As a last resort, you can use \pdfliteral (at least in pdflatex and lualatex, IIRC), altough it may not look as good in printing. Just modify the 0.25 bit to your taste. \documentclass{scrartcl} \newcommand*\mathbold[1]{\pdfliteral direct{2 Tr 0.25 w}#1\pdfliteral direct{0 Tr 0 w}} \begin{document} \[ \sum_{n=1}^{\infty} \frac1{n^2} = \frac{\pi^2}6. \...


You can add declarations for such inputs: \documentclass{article} \usepackage[utf8]{inputenc} \DeclareUnicodeCharacter{FB01}{fi} \begin{document} find \end{document}

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