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Mathematics - Q&A
https://math.codidact.com/
Mathematics on Codidact - open, community-run Q&A knowledge sharing
Recently noticed this open source math exchange-like site. The community is pretty slow (seems like there's lots of people interested in answering questions, but not so many posting them), which may make it a good target if you've got a good question that isn't getting the attention you'd like.
Curious if anybody knows other alternatives.