proposition: Lemma cent1v1 u : 1 \in 'C[u]%VS.
proof: Proof. by apply/cent1vP; rewrite commr1. 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)