proposition: Lemma tstpar1 a of is_test a : a ∥ 1 ≡ a.
proof: Proof. by apply/is_test_alt; rewrite domtst. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)