proposition: Lemma expv1n n : (1 ^+ n = 1)%VS.
proof: Proof. by elim: n => // n IHn; rewrite expvSl IHn prodv1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq path) mathcomp(choice fintype div tuple finfun bigop ssralg) mathcomp(finalg zmodp matrix vector poly)