∀ {B : Type u_1} {F : Type u_2} {Z : Type u_4} [inst : TopologicalSpace B] [inst_1 : TopologicalSpace F] {proj : Z → B}
  [inst_2 : TopologicalSpace Z] (e₁ e₁_1 : Bundle.Trivialization F proj) (e_e₁ : e₁ = e₁_1)
  (e₂ e₂_1 : Bundle.Trivialization F proj) (e_e₂ : e₂ = e₂_1) {b b_1 : B} (e_b : b = b_1) (h₁ : b ∈ e₁.baseSet)
  (h₂ : b ∈ e₂.baseSet), e₁.coordChangeHomeomorph e₂ h₁ h₂ = e₁_1.coordChangeHomeomorph e₂_1 ⋯ ⋯