Abel-Ruffini Theorem
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This article is a landmark page. It was the 6000th proof on ProofWiki!Theorem
There is no general algebraic solution for determining all the roots of a polynomial of degree $5$ or higher.
Proof
Galois theory seems the best choice; we probably also want the historical proofs of Abel and Ruffini
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Source of Name
This entry was named for Niels Henrik Abel and Paolo Ruffini.
