proposition: Lemma tstpar a x y of is_test a : a·(x∥y) ≡ a·x ∥ y.
proof: Proof. rewrite -[a]domtst. apply A14. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)