proposition: Lemma expvD U m n : (U ^+ (m + n) = U ^+ m * U ^+ n)%VS.
proof: Proof. by elim: m => [|m IHm]; rewrite ?prod1v // !expvSl IHm prodvA. 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)