∀ {B : Type u_1} {F : Type u_2} {E : B → Type u_3} [inst : TopologicalSpace B] [inst_1 : TopologicalSpace F]
  [inst_2 : (x : B) → Zero (E x)] (e : Bundle.Pretrivialization F Bundle.TotalSpace.proj) {b : B},
  b ∈ e.baseSet → ∀ (y : F), { proj := b, snd := e.symm b y } = ↑e.symm (b, y)