proposition: Lemma limgS f U V : (U <= V)%VS -> (f @: U <= f @: V)%VS.
proof: Proof. by rewrite unlock /subsetv !genmxE; apply: submxMr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)