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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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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my understanding was that there was a flaw in Ruffini's proof, that I'm not sure was ever corrected. Also, Abel was dead by 27.
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