Gateva-Ivanova's strong retraction conjecture for squarefree cycle sets

Let XX 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 TX:XXT_X:X\to X, xxxx\mapsto x\ast x, is the identity. Call XX retractable if there are distinct x,xXx,x'\in X such that xy=xyx\ast y=x'\ast y for every yXy\in X.

Gateva-Ivanova's strong conjecture. If XX is a squarefree cycle set with X>1|X|>1, then XX 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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