proposition: Lemma lfun_mulrV f : lker f == 0%VS -> f * f^-1%VF = 1.
proof: Proof. exact: lker0_compVf. 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)