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quintic-insolvability
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There is not. Galois explained why: solvability corresponds to a property of the equation's symmetry group, and the symmetric group on five letters lacks it. Galois theory, the tool built to close this question, became one of the foundations of modern algebra.
Evidence tier V3 is the import default for a result the curation records as settled in the published record. No formal proof or certificate is attached to this page yet.
Posed 16th century, after Cardano's cubic and Ferrari's quartic formulas. Closed 1824, Niels Henrik Abel (after Ruffini, 1799); explained by Galois, 1832.
Related problems
- The original curation links this problem to Inverse Galois problem; the argument for the link has not been written yet.