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Is there another controversial statement by Grothendieck apart from 57 being prime?

There is a well-known story about Grothendieck being asked to explain concretely some result involving prime numbers and of his answering "You mean an actual number? All right, take 57". See here. Un …
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Is there another controversial statement by Grothendieck apart from 57 being prime?

Yes, he did. In his Récoltes et semailles, volume I posthumously edited by Gallimard in 2022 he reminisces (in footnote 68, page 522) about his first encounter with $\pi$ as a child: "La valeur appro …
Georges Elencwajg's user avatar