Massey products on cycles of projective lines and trigonometric solutions of the Yang-Baxter equations

Alexander Polishchuk

We show that a nondegenerate unitary solution $r(u,v)$ of the associative Yang-Baxter equation (AYBE) for $\Mat(N,\C)$ (see math.AG/0008156) with the Laurent series at $u=0$ of the…