KnowraAbel–Ruffini theoremLinked fromLinked fromThe 7 pages that link to Abel–Ruffini theorem, each with the reason it gives.All 7Broader topic 1Related 2Compared with 4Quadratic equationCompared with: The quadratic formula belongs to the lower-degree solvability that fails in general beyond quartics.Évariste GaloisCompared with: It frames the impossibility question that Galois theory explains structurally.Cubic equationCompared with: It marks the boundary beyond cubic and quartic equations for universal radical formulas.Algebraic functionCompared with: Algebraic functions exist beyond those expressible by nested radicals.