Non-unitary set-theoretical solutions to the Quantum Yang-Baxter Equation

We develop a theory of non-unitary set-theoretical solutions to the Quantum Yang-Baxter equation. Our results generalize those obtained by Etingof, Schedler and the author in \cite{ESS}. We remark that some of our constructions are similar to constructions obtained by Lu, Yan, and Zhu in \cite{LYZ}.

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Published 1 January 2000