Cyrillic letters should be permitted as mathematical notation, because they mesh up with Hellenic letters and Latin letters well.https://twitter.com/Thalesdisciple/status/1199027301188399111 …
Lobachevski's function Л or https://en.m.wikipedia.org/wiki/Tate%E2%80%93Shafarevich_group … ?
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Both, and even Ж In Atiyah's Riemann Hypothesis paper.
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