proposition: Lemma vsproj_is_linear : linear vsproj.
proof: Proof. by move=> k w1 w2; apply: val_inj; rewrite unlock /= linearP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)