Theorem: FiberPrebundle.continuousOn_of_comp_right
File: Mathlib/Topology/FiberBundle/Basic.lean

Proof steps:
state_before: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
⊢ ContinuousOn f (TotalSpace.proj ⁻¹' s)
state_after: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
⊢ ContinuousOn f (TotalSpace.proj ⁻¹' s)
tactic: letI := a.totalSpaceTopology
state_before: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
⊢ ContinuousOn f (TotalSpace.proj ⁻¹' s)
state_after: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
⊢ ContinuousWithinAt f (TotalSpace.proj ⁻¹' s) z
tactic: intro z hz
state_before: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
⊢ ContinuousWithinAt f (TotalSpace.proj ⁻¹' s) z
state_after: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ ContinuousWithinAt f (TotalSpace.proj ⁻¹' s) z
tactic: let e : Trivialization F (π F E) :=
    a.trivializationOfMemPretrivializationAtlas (a.pretrivialization_mem_atlas z.proj)
state_before: ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ ContinuousWithinAt f (TotalSpace.proj ⁻¹' s) z
state_after: case refine_1
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ z.proj ∈ e.baseSet

case refine_2
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ IsOpen ((s ∩ (a.pretrivializationAt z.proj).baseSet) ×ˢ univ)

case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ ↑e z ∈ (s ∩ (a.pretrivializationAt z.proj).baseSet) ×ˢ univ
tactic: refine (e.continuousAt_of_comp_right ?_
    ((hf z.proj hz).continuousAt (IsOpen.mem_nhds ?_ ?_))).continuousWithinAt
state_before: case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ ↑e z ∈ (s ∩ (a.pretrivializationAt z.proj).baseSet) ×ˢ univ
state_after: case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ (↑e z).1 ∈ s ∩ (a.pretrivializationAt z.proj).baseSet
tactic: refine ⟨?_, mem_univ _⟩
state_before: case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ (↑e z).1 ∈ s ∩ (a.pretrivializationAt z.proj).baseSet
state_after: case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ z.proj ∈ s ∩ (a.pretrivializationAt z.proj).baseSet

case refine_3
ι : Type u_1
B : Type u_2
F : Type u_3
X✝ : Type u_4
inst✝⁴ : TopologicalSpace X✝
E : B → Type u_5
inst✝³ : TopologicalSpace B
inst✝² : TopologicalSpace F
inst✝¹ : (x : B) → TopologicalSpace (E x)
a : FiberPrebundle F E
e✝ : Pretrivialization F TotalSpace.proj
X : Type u_6
inst✝ : TopologicalSpace X
f : TotalSpace F E → X
s : Set B
hs : IsOpen s
hf : ∀ b ∈ s, ContinuousOn (f ∘ ↑(a.pretrivializationAt b).symm) ((s ∩ (a.pretrivializationAt b).baseSet) ×ˢ univ)
this : TopologicalSpace (TotalSpace F E) := a.totalSpaceTopology
z : TotalSpace F E
hz : z ∈ TotalSpace.proj ⁻¹' s
e : Trivialization F TotalSpace.proj := a.trivializationOfMemPretrivializationAtlas ⋯
⊢ z ∈ e.source
tactic: rw [e.coe_fst]