∀ {𝕜 : Type u_1} {B : Type u_2} {F : Type u_4} {E : B → Type u_6} [inst : NontriviallyNormedField 𝕜]
  [inst_1 : NormedAddCommGroup F] [inst_2 : NormedSpace 𝕜 F] [inst_3 : TopologicalSpace (Bundle.TotalSpace F E)]
  [inst_4 : (x : B) → TopologicalSpace (E x)] {EB : Type u_7} [inst_5 : NormedAddCommGroup EB]
  [inst_6 : NormedSpace 𝕜 EB] {HB : Type u_8} [inst_7 : TopologicalSpace HB] (IB : ModelWithCorners 𝕜 EB HB)
  [inst_8 : TopologicalSpace B] [inst_9 : ChartedSpace HB B] [inst_10 : FiberBundle F E]
  [inst_11 : (x : B) → AddCommMonoid (E x)] [inst_12 : (x : B) → Module 𝕜 (E x)] [inst_13 : VectorBundle 𝕜 F E]
  [ContMDiffVectorBundle 1 F E IB] (e : Bundle.Trivialization F Bundle.TotalSpace.proj) [MemTrivializationAtlas e]
  (s : (b : B) → E b) {b₀ : B},
  b₀ ∈ e.baseSet →
    (MDifferentiableAt IB (IB.prod (modelWithCornersSelf 𝕜 F)) (fun b => Bundle.TotalSpace.mk' F b (s b)) b₀ ↔
      MDifferentiableAt IB (modelWithCornersSelf 𝕜 F) (fun x => (↑e { proj := x, snd := s x }).2) b₀)