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It's a counterexample, not a proof. A schoolchild can confirm it.
by jibal 3mo ago
It's a counterexample, not a proof. A schoolchild can confirm it.
- tptacek 3mo agoWell, I mean, come on. There aren't that many minors who have taken basic multivariable calculus. But there are a lot of (technical) teenagers who could confirm it!