I study link invariants arising from set-theoretic solutions $(X,R)$ of the Yang–Baxter equation. Unlike the usual approach via braid colorings, I associate to each braid $betain B_n$ a co-coloring module defined as ${rm Coker}(beta -{rm id})$. I prove that this module is invariant under Markov moves; consequently, its Fitting ideals (and Groebner-basis computations of them) yield invariants of links. Examples indicate that the resulting invariants go beyond Alexander-type data and can be computed effectively..

https://indico.math.cnrs.fr/event/15630/