proposition: Lemma cent1vC u v : (u \in 'C[v])%VS = (v \in 'C[u])%VS.
proof: Proof. exact/cent1vP/cent1vP. 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)