proposition: Lemma cnvtst a of is_test a : a° ≡ a.
proof: Proof. rewrite -[a]tstpar1 cnvpar cnv1 -(dot1x (a°)) parC A10 cnvI parC. apply: domtst. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)