proposition: Lemma tstpar_r a x y of is_test a : a·(x∥y) ≡ x ∥ a·y.
proof: Proof. by rewrite parC tstpar parC. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)