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Questions that are about research in mathematics, or about the job of a research mathematician, without being mathematical problems or statements in the strictest sense. Do not use this tag for easy or supposedly easy mathematical questions.
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Theorems with many distinct proofs
I'll give one of the most fundamentals results in maths as an example: the reals are uncountable. Similarly, see: Asking for Various proofs of uncountability of $[0,1]$
The first proof of Cantor used …