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In the case shown (the flag is defined) you were inserting \par in math mode which is not allowed. \documentclass{article} \usepackage{amsmath,color} \newbox\zzbox % I've got several environments for conditional rendering, here's one \newenvironment{filled}{\relax\ifdefined\filledflag\else\setbox\zzbox\vbox\fi\bgroup} {\ifdefined\filledflag\else\par\fi\...

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Use \left.\right| For example $$\mathbb{E}(Y^3) = \left.\frac{d^3 M_Z(t)}{d t^3}\right|_{t=0}$$

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The package latexalpha2, as it is, requires unix and pdflatex. It was adapted to windows and extended to lualatex. See https://tex.stackexchange.com/a/579254/161015 for a complete answer. Note. Wolfram Engine must be installed and wolframscript must be fully working on the command prompt! WolframScript enables Wolfram Language code to be run from any ...

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