AWhat changed
EQP found a proof in 1996 that every Robbins algebra is Boolean, completing a longstanding algebraic problem after earlier human and automated work on sufficient conditions.
Scientific scope
EQP found a proof in 1996 that every Robbins algebra is Boolean, completing a longstanding algebraic problem after earlier human and automated work on sufficient conditions. Scope limitation: McCune authored the 1997 paper; Winker’s earlier conditions are separately credited. EQP proof discovery and later Otter reconstruction are distinct. WRS replays archived certificates with two custom local checkers; it has not rerun the original search or a Lean/Coq/Isabelle kernel, and has no independent reviewer or provider attestation.
Evidence
Assessment uses the catalogue-linked source evidence for the stated contribution. McCune authored the 1997 paper; Winker’s earlier conditions are separately credited. EQP proof discovery and later Otter reconstruction are distinct. WRS replays archived certificates with two custom local checkers; it has not rerun the original search or a Lean/Coq/Isabelle kernel, and has no independent reviewer or provider attestation.
Contributors
- William McCune · SCIENCE: Named source contributor; exact labor shares are not measured.
- S. Winker · SCIENCE: Named source contributor; exact labor shares are not measured.
- The systems documented in the research record · EXECUTION: Source-reported system assistance within this scope; no provider attestation or independent agency is inferred.
- McCune, Robbins Algebras Are Boolean; October 1996 announcement and historical account
- McCune, Solution of the Robbins Problem: JAR companion page and archived Otter certificates
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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