Gateva-Ivanova's strong retraction conjecture for squarefree cycle sets
Gateva-Ivanova's strong retraction conjecture for squarefree cycle sets
Let be a finite, nondegenerate cycle set, meaning a set with a binary operation satisfying the cycle-set axioms, and call it squarefree when its diagonal map , , is the identity. Call retractable if there are distinct such that for every .
Gateva-Ivanova's strong conjecture. If is a squarefree cycle set with , then is retractable.
This conjecture was refuted by Vendramin, who constructed suitable coverings of cycle sets. The broader retraction problem—finding criteria for retractability—remains relevant.
Sources & referencesView supporting material
Primary source
Carsten Dietzel, “Proof of Rump's Retraction Conjecture for Quasilinear Cycle Sets”, arXiv:2607.08609 (2026).
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