proposition: Lemma tst_dot_eqv: Proper (eqv ==> eqv ==> eqv) tst_dot.
proof: Proof. intros [a] [b] ? [c] [d] ?. by apply dot_eqv. Qed.
imports: HB(structures) Coq(Setoid Morphisms) mathcomp(all_ssreflect) GraphTheory(edone preliminaries setoid_bigop structures)