fact: Definition Equalizer {y z : C} (f g : y --> z) : UU := ∑ e : (∑ w : C, w --> y), (∑ H : (pr2 e) · f = (pr2 e) · g, isEqualizer f g (pr2 e) H).
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Monics UniMath.CategoryTheory.Retracts