proposition: Lemma limg_line f v : (f @: <[v]> = <[f v]>)%VS.
proof: Proof. apply/eqP; rewrite 2!unlock eqEsubv /subsetv /= r2vK !genmxE. by rewrite !(eqmxMr _ (genmxE _)) submx_refl. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)