Lemma minusNonnegativeRationals_correct_l : ∏ x y z : NonnegativeRationals, x = y + z -> z = x - y. Proof. intros x y z ->. now rewrite plusNonnegativeRationals_minus_l. Qed.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Sets. Require Import UniMath.MoreFoundations.Orders. Require Import UniMath.RealNumbers.Sets. Require Import UniMath.RealNumbers.Fields. Require Import UniMath.OrderTheory.Lattice.Lattice. Require Import UniMath.RealNumbers.Prelim.