Theorem: Bundle.contMDiffAt_totalSpace
File: Mathlib/Geometry/Manifold/VectorBundle/Basic.lean

Proof steps:
state_before: 𝕜 : Type u_1
B : Type u_2
B' : Type u_3
F : Type u_4
M : Type u_5
E : B → Type u_6
inst✝¹⁶ : NontriviallyNormedField 𝕜
inst✝¹⁵ : NormedAddCommGroup F
inst✝¹⁴ : NormedSpace 𝕜 F
inst✝¹³ : TopologicalSpace (TotalSpace F E)
inst✝¹² : (x : B) → TopologicalSpace (E x)
EB : Type u_7
inst✝¹¹ : NormedAddCommGroup EB
inst✝¹⁰ : NormedSpace 𝕜 EB
HB : Type u_8
inst✝⁹ : TopologicalSpace HB
IB : ModelWithCorners 𝕜 EB HB
E' : B → Type u_9
inst✝⁸ : (x : B) → Zero (E' x)
EM : Type u_10
inst✝⁷ : NormedAddCommGroup EM
inst✝⁶ : NormedSpace 𝕜 EM
HM : Type u_11
inst✝⁵ : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
inst✝⁴ : TopologicalSpace M
inst✝³ : ChartedSpace HM M
Is : SmoothManifoldWithCorners IM M
n : ℕ∞
inst✝² : TopologicalSpace B
inst✝¹ : ChartedSpace HB B
inst✝ : FiberBundle F E
f : M → TotalSpace F E
x₀ : M
⊢ ContMDiffAt IM (IB.prod 𝓘(𝕜, F)) n f x₀ ↔
    ContMDiffAt IM IB n (fun x => (f x).proj) x₀ ∧
      ContMDiffAt IM 𝓘(𝕜, F) n (fun x => (↑(trivializationAt F E (f x₀).proj) (f x)).2) x₀
state_after: 𝕜 : Type u_1
B : Type u_2
B' : Type u_3
F : Type u_4
M : Type u_5
E : B → Type u_6
inst✝¹⁶ : NontriviallyNormedField 𝕜
inst✝¹⁵ : NormedAddCommGroup F
inst✝¹⁴ : NormedSpace 𝕜 F
inst✝¹³ : TopologicalSpace (TotalSpace F E)
inst✝¹² : (x : B) → TopologicalSpace (E x)
EB : Type u_7
inst✝¹¹ : NormedAddCommGroup EB
inst✝¹⁰ : NormedSpace 𝕜 EB
HB : Type u_8
inst✝⁹ : TopologicalSpace HB
IB : ModelWithCorners 𝕜 EB HB
E' : B → Type u_9
inst✝⁸ : (x : B) → Zero (E' x)
EM : Type u_10
inst✝⁷ : NormedAddCommGroup EM
inst✝⁶ : NormedSpace 𝕜 EM
HM : Type u_11
inst✝⁵ : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
inst✝⁴ : TopologicalSpace M
inst✝³ : ChartedSpace HM M
Is : SmoothManifoldWithCorners IM M
n : ℕ∞
inst✝² : TopologicalSpace B
inst✝¹ : ChartedSpace HB B
inst✝ : FiberBundle F E
f : M → TotalSpace F E
x₀ : M
⊢ ContMDiffWithinAt IM (IB.prod 𝓘(𝕜, F)) n f univ x₀ ↔
    ContMDiffWithinAt IM IB n (fun x => (f x).proj) univ x₀ ∧
      ContMDiffWithinAt IM 𝓘(𝕜, F) n (fun x => (↑(trivializationAt F E (f x₀).proj) (f x)).2) univ x₀
tactic: simp_rw [← contMDiffWithinAt_univ]
state_before: 𝕜 : Type u_1
B : Type u_2
B' : Type u_3
F : Type u_4
M : Type u_5
E : B → Type u_6
inst✝¹⁶ : NontriviallyNormedField 𝕜
inst✝¹⁵ : NormedAddCommGroup F
inst✝¹⁴ : NormedSpace 𝕜 F
inst✝¹³ : TopologicalSpace (TotalSpace F E)
inst✝¹² : (x : B) → TopologicalSpace (E x)
EB : Type u_7
inst✝¹¹ : NormedAddCommGroup EB
inst✝¹⁰ : NormedSpace 𝕜 EB
HB : Type u_8
inst✝⁹ : TopologicalSpace HB
IB : ModelWithCorners 𝕜 EB HB
E' : B → Type u_9
inst✝⁸ : (x : B) → Zero (E' x)
EM : Type u_10
inst✝⁷ : NormedAddCommGroup EM
inst✝⁶ : NormedSpace 𝕜 EM
HM : Type u_11
inst✝⁵ : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
inst✝⁴ : TopologicalSpace M
inst✝³ : ChartedSpace HM M
Is : SmoothManifoldWithCorners IM M
n : ℕ∞
inst✝² : TopologicalSpace B
inst✝¹ : ChartedSpace HB B
inst✝ : FiberBundle F E
f : M → TotalSpace F E
x₀ : M
⊢ ContMDiffWithinAt IM (IB.prod 𝓘(𝕜, F)) n f univ x₀ ↔
    ContMDiffWithinAt IM IB n (fun x => (f x).proj) univ x₀ ∧
      ContMDiffWithinAt IM 𝓘(𝕜, F) n (fun x => (↑(trivializationAt F E (f x₀).proj) (f x)).2) univ x₀
state_after: no goals
tactic: exact contMDiffWithinAt_totalSpace f