proposition: Lemma ispositive_plusNonnegativeRationals_l : ∏ x y : NonnegativeRationals, 0 < x -> 0 < x + y.
proof: Proof. intros x y Hx. apply istrans_lt_le_ltNonnegativeRationals with x. - exact Hx. - now apply plusNonnegativeRationals_le_r. Qed.
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Sets UniMath.MoreFoundations.Orders UniMath.RealNumbers.Sets UniMath.RealNumbers.Fields UniMath.Algebra.DivisionRig UniMath.OrderTheory.Lattice.Lattice UniMath.RealNumbers.Prelim