Theorem: MeasureTheory.Measure.ext_of_Iic
File: Mathlib/MeasureTheory/Constructions/BorelSpace/Order.lean

tactic: refine ext_of_Ioc_finite μ ν ?_ fun a b hlt => ?_
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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a b x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
⊢ μ = ν
state_after: case refine_1
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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a b x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
⊢ μ univ = ν univ

case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ μ (Ioc a b) = ν (Ioc a b)

tactic: rw [← Iic_diff_Iic, measure_diff (Iic_subset_Iic.2 hlt.le) measurableSet_Iic,
  measure_diff (Iic_subset_Iic.2 hlt.le) measurableSet_Iic, h a, h b]
state_before: case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ μ (Ioc a b) = ν (Ioc a b)
state_after: case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ ν (Iic a) ≠ ⊤

case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ μ (Iic a) ≠ ⊤

tactic: rcases exists_countable_dense_bot_top α with ⟨s, hsc, hsd, -, hst⟩
state_before: case refine_1
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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a b x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
⊢ μ univ = ν univ
state_after: case refine_1.intro.intro.intro.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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a b x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
s : Set α
hsc : s.Countable
hsd : Dense s
hst : ∀ (x : α), IsTop x → x ∈ s
⊢ μ univ = ν univ

tactic: simp only [← biSup_measure_Iic hsc (hsd.exists_ge' hst) this, h]
state_before: case refine_1.intro.intro.intro.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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a b x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
s : Set α
hsc : s.Countable
hsd : Dense s
hst : ∀ (x : α), IsTop x → x ∈ s
this : DirectedOn (fun x x_1 => x ≤ x_1) s
⊢ μ univ = ν univ
state_after: no goals

tactic: rw [← h a]
state_before: case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ ν (Iic a) ≠ ⊤
state_after: case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ μ (Iic a) ≠ ⊤

tactic: exact (measure_lt_top μ _).ne
state_before: case refine_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✝¹¹ : TopologicalSpace α✝
inst✝¹⁰ : MeasurableSpace α✝
inst✝⁹ : OpensMeasurableSpace α✝
inst✝⁸ : MeasurableSpace δ
inst✝⁷ : LinearOrder α✝
inst✝⁶ : OrderClosedTopology α✝
a✝ b✝ x : α✝
α : Type u_5
inst✝⁵ : TopologicalSpace α
m : MeasurableSpace α
inst✝⁴ : SecondCountableTopology α
inst✝³ : LinearOrder α
inst✝² : OrderTopology α
inst✝¹ : BorelSpace α
μ ν : Measure α
inst✝ : IsFiniteMeasure μ
h : ∀ (a : α), μ (Iic a) = ν (Iic a)
a b : α
hlt : a < b
⊢ μ (Iic a) ≠ ⊤
state_after: no goals