Theorem: MeasureTheory.IsFundamentalDomain.aEStronglyMeasurable_on_iff
File: Mathlib/MeasureTheory/Group/FundamentalDomain.lean

Proof steps:
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
⊢ AEStronglyMeasurable f (μ.restrict s) ↔ AEStronglyMeasurable f (sum fun g => μ.restrict (g • t ∩ s))
state_after: no goals
tactic: simp only [← ht.restrict_restrict,
        ht.sum_restrict_of_ac restrict_le_self.absolutelyContinuous]
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
⊢ AEStronglyMeasurable f (sum fun g => μ.restrict (g • t ∩ s)) ↔
    ∀ (g : G), AEStronglyMeasurable f (μ.restrict (g • (g⁻¹ • s ∩ t)))
state_after: no goals
tactic: simp only [smul_set_inter, inter_comm, smul_inv_smul, aestronglyMeasurable_sum_measure_iff]
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
⊢ (∀ (g : G), AEStronglyMeasurable f (μ.restrict (g⁻¹ • (g⁻¹⁻¹ • s ∩ t)))) ↔
    ∀ (g : G), AEStronglyMeasurable f (μ.restrict (g⁻¹ • (g • s ∩ t)))
state_after: no goals
tactic: simp only [inv_inv]
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
⊢ (∀ (g : G), AEStronglyMeasurable f (μ.restrict (g⁻¹ • (g • s ∩ t)))) ↔
    ∀ (g : G), AEStronglyMeasurable f (μ.restrict (g • s ∩ t))
state_after: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
g : G
⊢ AEStronglyMeasurable f (μ.restrict (g⁻¹ • (g • s ∩ t))) ↔ AEStronglyMeasurable f (μ.restrict (g • s ∩ t))
tactic: refine forall_congr' fun g => ?_
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
g : G
he : MeasurableEmbedding fun x => g⁻¹ • x
⊢ AEStronglyMeasurable f (μ.restrict (g⁻¹ • (g • s ∩ t))) ↔ AEStronglyMeasurable f (μ.restrict (g • s ∩ t))
state_after: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
g : G
he : MeasurableEmbedding fun x => g⁻¹ • x
⊢ AEStronglyMeasurable (f ∘ fun x => g⁻¹ • x) (μ.restrict (g • s ∩ t)) ↔ AEStronglyMeasurable f (μ.restrict (g • s ∩ t))
tactic: rw [← image_smul, ← ((measurePreserving_smul g⁻¹ μ).restrict_image_emb he
        _).aestronglyMeasurable_comp_iff he]
state_before: G : Type u_1
H : Type u_2
α : Type u_3
β✝ : Type u_4
E : Type u_5
inst✝¹² : Group G
inst✝¹¹ : Group H
inst✝¹⁰ : MulAction G α
inst✝⁹ : MeasurableSpace α
inst✝⁸ : MulAction H β✝
inst✝⁷ : MeasurableSpace β✝
inst✝⁶ : NormedAddCommGroup E
s t : Set α
μ : Measure α
inst✝⁵ : MeasurableSpace G
inst✝⁴ : MeasurableSMul G α
inst✝³ : SMulInvariantMeasure G α μ
inst✝² : Countable G
ν : Measure α
β : Type u_6
inst✝¹ : TopologicalSpace β
inst✝ : PseudoMetrizableSpace β
hs : IsFundamentalDomain G s μ
ht : IsFundamentalDomain G t μ
f : α → β
hf : ∀ (g : G) (x : α), f (g • x) = f x
⊢ (∀ (g : G), AEStronglyMeasurable f (μ.restrict (g • s ∩ t))) ↔ AEStronglyMeasurable f (μ.restrict t)
state_after: no goals
tactic: simp only [← aestronglyMeasurable_sum_measure_iff, ← hs.restrict_restrict,
        hs.sum_restrict_of_ac restrict_le_self.absolutelyContinuous]