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  • kaotheorems.sty and kaorefs.sty are not in texlive, this I assume? github.com/fmarotta/kaobook Commented Nov 5, 2023 at 20:44
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    @DavidCarlisle \documentclass[]{article} \usepackage{newpx} \usepackage{lmodern} \begin{document} N'affiche pas le + : $1+1$. \end{document} Commented Nov 5, 2023 at 20:47
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    do not load lmodern. That clashes with newpx loaded by the class. Commented Nov 5, 2023 at 20:47
  • The class (actually the kao.sty package) is quite inflexible and uses Libertinus with XeLaTeX or LuaLaTeX and, for strange reasons, newpx with pdflatex, offering no option for disabling the choice. So if you later load lmodern you have to expect problems.
    – egreg
    Commented Nov 5, 2023 at 22:43