Reflections and Drinfeld twists for set-theoretic Yang-Baxter maps

Abstract: We prove that reflections, for a solution to the set-theoretic Yang-Baxter equation, provide Drinfeld twists in the sense of Kulish and Mudrov. Using De Commer's notion of a braided action, we then define group reflections for a braided group, and prove that they provide group Drinfeld twists in the sense of Ghobadi. Finally, we characterise when a reflection on a solution (X,r) can be extended to a group reflection on the structure group G(X,r).