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For question in Proof Theory, where "proofs" themselves are the object of mathematical investigation. It is not to be used to request a proof of some result.

21 votes

When are two proofs of the same theorem really different proofs

My opinion, and it's only an opinion, is that it would be very difficult to formalise what it means for two proofs to be different. Here's an intuitive reason why. If I give you two proofs of theorem …
Kevin Buzzard's user avatar