Lemma islinv_Rinv : ∏ (x : Reals) (Hx0 : x ≠ 0), (Rinv x Hx0) * x = 1. Proof. exact islinv_CFinv. Qed.
Require Import UniMath.Foundations.Preamble. Require Import UniMath.MoreFoundations.Orders. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.OrderTheory.Lattice.Lattice. Require Import UniMath.RealNumbers.Prelim. Require Import UniMath.RealNumbers.Sets. Require Import UniMath.RealNumbers.NonnegativeRationals.