A characterization of finite multipermutation solutions of the Yang-Baxter equation
classification
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equationfinitemultipermutationsolutionyang-baxteradmitscharacterizationcyclic
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We prove that a finite non-degenerate involutive set-theoretic solution (X,r) of the Yang-Baxter equation is a multipermutation solution if and only if its structure group G(X,r) admits a left ordering or equivalently it is poly-(infinite cyclic).
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