Theorem: measurable_of_Iio
File: Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean

tactic: convert measurable_generateFrom (α := δ) _
state_before: α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ Measurable f
state_after: case h.e'_4
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ inst✝⁸ = MeasurableSpace.generateFrom ?convert_2

case convert_2
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ Set (Set α)

case convert_4
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ ∀ t ∈ ?convert_2, MeasurableSet (f ⁻¹' t)

tactic: exact BorelSpace.measurable_eq.trans (borel_eq_generateFrom_Iio _)
state_before: case h.e'_4
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ inst✝⁸ = MeasurableSpace.generateFrom ?convert_2
state_after: no goals

tactic: rintro _ ⟨x, rfl⟩
state_before: case convert_4
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
⊢ ∀ t ∈ range Iio, MeasurableSet (f ⁻¹' t)
state_after: case convert_4.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
x : α
⊢ MeasurableSet (f ⁻¹' Iio x)

tactic: exact hf x
state_before: case convert_4.intro
α : Type u_1
β : Type u_2
γ : Type u_3
δ : Type u_4
ι : Sort y
s t u : Set α
inst✝⁹ : TopologicalSpace α
inst✝⁸ : MeasurableSpace α
inst✝⁷ : BorelSpace α
inst✝⁶ : TopologicalSpace β
inst✝⁵ : MeasurableSpace β
inst✝⁴ : BorelSpace β
inst✝³ : MeasurableSpace δ
inst✝² : LinearOrder α
inst✝¹ : OrderTopology α
inst✝ : SecondCountableTopology α
f : δ → α
hf : ∀ (x : α), MeasurableSet (f ⁻¹' Iio x)
x : α
⊢ MeasurableSet (f ⁻¹' Iio x)
state_after: no goals