proposition: Lemma Rmult_integral_contrapositive_currified : forall r1 r2, r1 <> 0 -> r2 <> 0 -> r1 * r2 <> 0.
proof: Proof. now intros r1 r2 H1 H2; apply Rmult_integral_contrapositive. Qed.
imports: RelationClasses Raxioms Rpow_def ZArith ZArithRing RealField