proposition: Lemma centv_algid A : algid A \in 'C(A)%VS.
proof: Proof. by apply/centvP=> u Au; rewrite algidl ?algidr. 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)