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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.

12 votes

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 …