fact: Definition isEqualizer'_weq (is : isEqualizer') : ∏ a, (a --> E) ≃ (∑ k : a --> c, (k · f = k · g)) := λ a, make_weq (postcomp_with_equalizer_mor a) (is a).
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