add \notni
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mennucc commented
Description
for set membership the Wikipedia page
lists four LaTeX commands: \in \ni \notin \notni ; unfortunately unicode-math does not define the latter.
Minimal example demonstrating the issue
\documentclass{article}
\usepackage{unicode-math}
\setmathfont{STIX Two Math}
\begin{document}
\[
a \notni b
\]
\end{document}Further details
possible patch