proposition: Lemma cent1vX u n : u ^+ n \in 'C[u]%VS.
proof: Proof. exact/cent1vP/esym/commrX. 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)