proposition: Lemma lfun_mulE f g u : (f * g) u = g (f u).
proof: Proof. exact: lfunE. 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)