Answer by Ben for Questions about notation
A strong indication that many questions about notation are on-topic is that the tag (notation) has (as of today) 84 questions, at least half of which are well received.I personally think the "Why was...
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There seems to be a disagreement about whether or when a question about mathematics notation is on-topic. For example, see the comments in \mathbb versus \mathbf one of which claims that this...
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