Definition left_equivalence {a b : B} (f : a --> b) :UU := ∑ (αd : left_adjoint_data f), left_equivalence_axioms αd.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.Bicategories.Core.Bicat. Import Bicat.Notations. Require Import UniMath.Bicategories.Core.Invertible_2cells.