This is true but usenet and mailing lists were a way to scale your professor's office hours. Which is to say that they were good at telling you to solve the precise thing you are struggling with, while simultaneously asking "what don't you get about this?!"https://twitter.com/katzmandu/status/982262800956383233 …
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Galois' proof of the non-solvability by radicals of the general quintic is so brilliant that it almost makes me want to shift to become an algebraist. It's what Erdős may have called a "proof from The Book."
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(I should actually look up if he said that) Galois' proof came chronologically after the results by Abel and Ruffini, so we still call the proof the Abel-Ruffini Theorem today. But their solution was a sledgehammer and Galois' was artful.
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It's interesting that the Abel-Ruffini Theorem implicitly comes up in data science all the time and we don't ever realize it. A consequence of the result is that the eigenvalues of a general matrix of degree 5 or greater cannot be computed non-iteratively.
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