proposition: Lemma vsvalK : cancel vsval vsproj.
proof: Proof. by move=> w; apply/val_inj/vsprojK/subvsP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)