-- Mathlib/Geometry/Manifold/VectorBundle/Hom.lean
/-- Consider a `C^n` map `v : M → E₁` to a vector bundle, over a basemap `b₁ : M → B₁`, and
another basemap `b₂ : M → B₂`. Given linear maps `ϕ m : E₁ (b₁ m) → E₂ (b₂ m)` depending smoothly
on `m`, one can apply `ϕ m` to `g m`, and the resulting map is `C^n`.

Note that the smoothness of `ϕ` can not be always be stated as smoothness of a map into a manifold,
as the pullback bundles `b₁ *ᵖ E₁` and `b₂ *ᵖ E₂` only make sense when `b₁` and `b₂` are globally
smooth, but we want to apply this lemma with only local information. Therefore, we formulate it
using smoothness of `ϕ` read in coordinates.

Version for `ContMDiffWithinAt`. We also give a version for `ContMDiffAt`, but no version for
`ContMDiffOn` or `ContMDiff` as our assumption, written in coordinates, only makes sense around
a point.
-/
lemma ContMDiffWithinAt.clm_apply_of_inCoordinates
    (hϕ : ContMDiffWithinAt IM 𝓘(𝕜, F₁ →L[𝕜] F₂) n
      (fun m ↦ inCoordinates F₁ E₁ F₂ E₂ (b₁ m₀) (b₁ m) (b₂ m₀) (b₂ m) (ϕ m)) s m₀)
    (hv : ContMDiffWithinAt IM (IB₁.prod 𝓘(𝕜, F₁)) n (fun m ↦ (v m : TotalSpace F₁ E₁)) s m₀)
    (hb₂ : ContMDiffWithinAt IM IB₂ n b₂ s m₀) :
    ContMDiffWithinAt IM (IB₂.prod 𝓘(𝕜, F₂)) n (fun m ↦ (ϕ m (v m) : TotalSpace F₂ E₂)) s m₀

Proof state:
case h
𝕜 : Type u_1
F₁ : Type u_2
F₂ : Type u_3
B₁ : Type u_4
B₂ : Type u_5
M : Type u_6
E₁ : B₁ → Type u_7
E₂ : B₂ → Type u_8
inst✝³¹ : NontriviallyNormedField 𝕜
inst✝³⁰ : (x : B₁) → AddCommGroup (E₁ x)
inst✝²⁹ : (x : B₁) → Module 𝕜 (E₁ x)
inst✝²⁸ : NormedAddCommGroup F₁
inst✝²⁷ : NormedSpace 𝕜 F₁
inst✝²⁶ : TopologicalSpace (TotalSpace F₁ E₁)
inst✝²⁵ : (x : B₁) → TopologicalSpace (E₁ x)
inst✝²⁴ : (x : B₂) → AddCommGroup (E₂ x)
inst✝²³ : (x : B₂) → Module 𝕜 (E₂ x)
inst✝²² : NormedAddCommGroup F₂
inst✝²¹ : NormedSpace 𝕜 F₂
inst✝²⁰ : TopologicalSpace (TotalSpace F₂ E₂)
inst✝¹⁹ : (x : B₂) → TopologicalSpace (E₂ x)
EB₁ : Type u_9
inst✝¹⁸ : NormedAddCommGroup EB₁
inst✝¹⁷ : NormedSpace 𝕜 EB₁
HB₁ : Type u_10
inst✝¹⁶ : TopologicalSpace HB₁
IB₁ : ModelWithCorners 𝕜 EB₁ HB₁
inst✝¹⁵ : TopologicalSpace B₁
inst✝¹⁴ : ChartedSpace HB₁ B₁
EB₂ : Type u_11
inst✝¹³ : NormedAddCommGroup EB₂
inst✝¹² : NormedSpace 𝕜 EB₂
HB₂ : Type u_12
inst✝¹¹ : TopologicalSpace HB₂
IB₂ : ModelWithCorners 𝕜 EB₂ HB₂
inst✝¹⁰ : TopologicalSpace B₂
inst✝⁹ : ChartedSpace HB₂ B₂
EM : Type u_13
inst✝⁸ : NormedAddCommGroup EM
inst✝⁷ : NormedSpace 𝕜 EM
HM : Type u_14
inst✝⁶ : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
inst✝⁵ : TopologicalSpace M
inst✝⁴ : ChartedSpace HM M
n : WithTop ℕ∞
inst✝³ : FiberBundle F₁ E₁
inst✝² : VectorBundle 𝕜 F₁ E₁
inst✝¹ : FiberBundle F₂ E₂
inst✝ : VectorBundle 𝕜 F₂ E₂
b₁ : M → B₁
b₂ : M → B₂
m₀ : M
ϕ : (m : M) → E₁ (b₁ m) →L[𝕜] E₂ (b₂ m)
v : (m : M) → E₁ (b₁ m)
s : Set M
hϕ :
  ContMDiffWithinAt IM 𝓘(𝕜, F₁ →L[𝕜] F₂) n (fun m => inCoordinates F₁ E₁ F₂ E₂ (b₁ m₀) (b₁ m) (b₂ m₀) (b₂ m) (ϕ m))
    (insert m₀ s) m₀
hv :
  ContMDiffWithinAt IM IB₁ n (fun x => { proj := b₁ x, snd := v x }.proj) (insert m₀ s) m₀ ∧
    ContMDiffWithinAt IM 𝓘(𝕜, F₁) n
      (fun x => (↑(trivializationAt F₁ E₁ { proj := b₁ m₀, snd := v m₀ }.proj) { proj := b₁ x, snd := v x }).2)
      (insert m₀ s) m₀
hb₂ : ContMDiffWithinAt IM IB₂ n b₂ (insert m₀ s) m₀
A : ∀ᶠ (m : M) in 𝓝[insert m₀ s] m₀, b₁ m ∈ (trivializationAt F₁ E₁ (b₁ m₀)).baseSet
A' : ∀ᶠ (m : M) in 𝓝[insert m₀ s] m₀, b₂ m ∈ (trivializationAt F₂ E₂ (b₂ m₀)).baseSet
m : M
hm : b₁ m ∈ (trivializationAt F₁ E₁ (b₁ m₀)).baseSet
h'm : b₂ m ∈ (trivializationAt F₂ E₂ (b₂ m₀)).baseSet
⊢ (↑(trivializationAt F₂ E₂ (b₂ m₀)) { proj := b₂ m, snd := (ϕ m) (v m) }).2 =
    ((↑(Trivialization.continuousLinearEquivAt 𝕜 (trivializationAt F₂ E₂ (b₂ m₀)) (b₂ m) h'm)).comp
        ((ϕ m).comp ↑(Trivialization.continuousLinearEquivAt 𝕜 (trivializationAt F₁ E₁ (b₁ m₀)) (b₁ m) hm).symm))
      (↑(trivializationAt F₁ E₁ (b₁ m₀)) { proj := b₁ m, snd := v m }).2

Tactic:
simp only [coe_comp', ContinuousLinearEquiv.coe_coe, Trivialization.continuousLinearEquivAt_apply,
  Trivialization.continuousLinearEquivAt_symm_apply, Function.comp_apply]

Result:
case h
𝕜 : Type u_1
F₁ : Type u_2
F₂ : Type u_3
B₁ : Type u_4
B₂ : Type u_5
M : Type u_6
E₁ : B₁ → Type u_7
E₂ : B₂ → Type u_8
inst✝³¹ : NontriviallyNormedField 𝕜
inst✝³⁰ : (x : B₁) → AddCommGroup (E₁ x)
inst✝²⁹ : (x : B₁) → Module 𝕜 (E₁ x)
inst✝²⁸ : NormedAddCommGroup F₁
inst✝²⁷ : NormedSpace 𝕜 F₁
inst✝²⁶ : TopologicalSpace (TotalSpace F₁ E₁)
inst✝²⁵ : (x : B₁) → TopologicalSpace (E₁ x)
inst✝²⁴ : (x : B₂) → AddCommGroup (E₂ x)
inst✝²³ : (x : B₂) → Module 𝕜 (E₂ x)
inst✝²² : NormedAddCommGroup F₂
inst✝²¹ : NormedSpace 𝕜 F₂
inst✝²⁰ : TopologicalSpace (TotalSpace F₂ E₂)
inst✝¹⁹ : (x : B₂) → TopologicalSpace (E₂ x)
EB₁ : Type u_9
inst✝¹⁸ : NormedAddCommGroup EB₁
inst✝¹⁷ : NormedSpace 𝕜 EB₁
HB₁ : Type u_10
inst✝¹⁶ : TopologicalSpace HB₁
IB₁ : ModelWithCorners 𝕜 EB₁ HB₁
inst✝¹⁵ : TopologicalSpace B₁
inst✝¹⁴ : ChartedSpace HB₁ B₁
EB₂ : Type u_11
inst✝¹³ : NormedAddCommGroup EB₂
inst✝¹² : NormedSpace 𝕜 EB₂
HB₂ : Type u_12
inst✝¹¹ : TopologicalSpace HB₂
IB₂ : ModelWithCorners 𝕜 EB₂ HB₂
inst✝¹⁰ : TopologicalSpace B₂
inst✝⁹ : ChartedSpace HB₂ B₂
EM : Type u_13
inst✝⁸ : NormedAddCommGroup EM
inst✝⁷ : NormedSpace 𝕜 EM
HM : Type u_14
inst✝⁶ : TopologicalSpace HM
IM : ModelWithCorners 𝕜 EM HM
inst✝⁵ : TopologicalSpace M
inst✝⁴ : ChartedSpace HM M
n : WithTop ℕ∞
inst✝³ : FiberBundle F₁ E₁
inst✝² : VectorBundle 𝕜 F₁ E₁
inst✝¹ : FiberBundle F₂ E₂
inst✝ : VectorBundle 𝕜 F₂ E₂
b₁ : M → B₁
b₂ : M → B₂
m₀ : M
ϕ : (m : M) → E₁ (b₁ m) →L[𝕜] E₂ (b₂ m)
v : (m : M) → E₁ (b₁ m)
s : Set M
hϕ :
  ContMDiffWithinAt IM 𝓘(𝕜, F₁ →L[𝕜] F₂) n (fun m => inCoordinates F₁ E₁ F₂ E₂ (b₁ m₀) (b₁ m) (b₂ m₀) (b₂ m) (ϕ m))
    (insert m₀ s) m₀
hv :
  ContMDiffWithinAt IM IB₁ n (fun x => { proj := b₁ x, snd := v x }.proj) (insert m₀ s) m₀ ∧
    ContMDiffWithinAt IM 𝓘(𝕜, F₁) n
      (fun x => (↑(trivializationAt F₁ E₁ { proj := b₁ m₀, snd := v m₀ }.proj) { proj := b₁ x, snd := v x }).2)
      (insert m₀ s) m₀
hb₂ : ContMDiffWithinAt IM IB₂ n b₂ (insert m₀ s) m₀
A : ∀ᶠ (m : M) in 𝓝[insert m₀ s] m₀, b₁ m ∈ (trivializationAt F₁ E₁ (b₁ m₀)).baseSet
A' : ∀ᶠ (m : M) in 𝓝[insert m₀ s] m₀, b₂ m ∈ (trivializationAt F₂ E₂ (b₂ m₀)).baseSet
m : M
hm : b₁ m ∈ (trivializationAt F₁ E₁ (b₁ m₀)).baseSet
h'm : b₂ m ∈ (trivializationAt F₂ E₂ (b₂ m₀)).baseSet
⊢ (↑(trivializationAt F₂ E₂ (b₂ m₀)) { proj := b₂ m, snd := (ϕ m) (v m) }).2 =
    (↑(trivializationAt F₂ E₂ (b₂ m₀))
        { proj := b₂ m,
          snd :=
            (ϕ m)
              ((trivializationAt F₁ E₁ (b₁ m₀)).symm (b₁ m)
                (↑(trivializationAt F₁ E₁ (b₁ m₀)) { proj := b₁ m, snd := v m }).2) }).2