proposition: Lemma cent1v_id u : u \in 'C[u]%VS.
proof: Proof. exact/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)