proposition: Lemma pos_div_three : forall eps : R, [0] [<] eps -> [0] [<] eps [/]ThreeNZ.
proof: Proof. intros. apply mult_cancel_less with (Three:R). apply pos_three. astepl ([0]:R); rstepr eps. assumption. Qed.
imports: CoRN.tactics.FieldReflection CoRN.tactics.Rational CoRN.algebra.CSetoids Coq(Lia)