proposition: Fact lfun_mulRVr f : lker f == 0%VS -> lfun_invr f * f = 1.
proof: Proof. by move=> Uf; rewrite /lfun_invr Uf lfun_mulVr. 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)