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真部分集合は$A \subsetneq B$よりも$A \subset B$、部分集合は$A \subset B$よりも$A \subseteq B$と表すほうがしっくりくるなあ...

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Mathtodon

A Mastodon instance named Mathtodon, where you can post toots with beautiful mathematical formulae in TeX/LaTeX style.