proposition: Lemma lker0_lfunVK : cancel f^-1%VF f.
proof: Proof. by move=> u; rewrite limg_lfunVK // lker0_limgf memvf. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)