proposition: Lemma lfun_invE f : lker f == 0%VS -> f^-1%VF = f^-1.
proof: Proof. by rewrite /f^-1 /= /lfun_invr => ->. 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)