Leonard Euler. Enough said.pic.twitter.com/VlnfMwNHMV
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The idea of what makes an acceptably rigorous proof evolved considerably in the following 100-150 years too. So much in fact that most of the proofs by "the master of us all" (in the words of Lagrange) would have been considered claims these days.
I agree.. The whole logical positivist movement (which ultimately failed thanks to Gödel) I think, in large part, was a big step forward..
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