fact: Definition z_iso_in_SET_to_z_iso_in_REL {X Y : HSET} (i : z_iso (C := HSET) X Y) : z_iso (C := REL) X Y := _ ,, invertiblefunction_to_invertiblerelation (pr2 i).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Categories.HSET.All