Lemma minusNonnegativeRationals_zero_l : ∏ x : NonnegativeRationals, 0 - x = 0. Proof. intros x. apply minusNonnegativeRationals_eq_zero. now apply isnonnegative_NonnegativeRationals. 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.