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It is easier for the keys expecting a <dimen>. For those expecting a decimal, you need something extra, as this is not implemented in core LaTeX. I do it here with package xintexpr. Indeed its macros are expandable. \documentclass{article} \usepackage[T1]{fontenc} \usepackage{lmodern} \usepackage{lettrine} \usepackage{xintexpr} ...


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One solution would be to use the unicode-symbol U+229C for this. For example with the package unicode-math. % arara: lualatex \documentclass{article} \usepackage{unicode-math} \begin{document} \[\oplus\ominus\otimes\oslash\odot\circledcirc\circledast\circledequal\circleddash\] \end{document} \circledequal or \symbol{"229C} yield your desired symbol in ...



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