fact: Definition fundamental_groupoid_2cell_iso {x y : fundamental_bigroupoid} {p₁ p₂ : fundamental_bigroupoid⟦x,y⟧} (s : p₁ ==> p₂) : is_invertible_2cell s.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Univalence UniMath.Bicategories.Morphisms.Adjunctions UniMath.Bicategories.Core.EquivToAdjequiv UniMath.Bicategories.Core.AdjointUnique