Theorem: ProbabilityTheory.strong_law_ae_real
File: Mathlib/Probability/StrongLaw.lean

Proof steps:
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: let pos : ℝ → ℝ := fun x => max x 0
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: let neg : ℝ → ℝ := fun x => max (-x) 0
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: have posm : Measurable pos := measurable_id'.max measurable_const
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: have negm : Measurable neg := measurable_id'.neg.max measurable_const
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: have A : ∀ᵐ ω, Tendsto (fun n : ℕ => (∑ i ∈ range n, (pos ∘ X i) ω) / n) atTop (𝓝 𝔼[pos ∘ X 0]) :=
    strong_law_aux7 _ hint.pos_part (fun i j hij => (hindep hij).comp posm posm)
      (fun i => (hident i).comp posm) fun i ω => le_max_right _ _
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: have B : ∀ᵐ ω, Tendsto (fun n : ℕ => (∑ i ∈ range n, (neg ∘ X i) ω) / n) atTop (𝓝 𝔼[neg ∘ X 0]) :=
    strong_law_aux7 _ hint.neg_part (fun i j hij => (hindep hij).comp negm negm)
      (fun i => (hident i).comp negm) fun i ω => le_max_right _ _
state_before: Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: case h
Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
ω : Ω
hωpos : Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
hωneg : Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
tactic: filter_upwards [A, B] with ω hωpos hωneg
state_before: case h
Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
ω : Ω
hωpos : Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
hωneg : Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ Tendsto (fun n => (∑ i ∈ range n, X i ω) / ↑n) atTop (𝓝 (∫ (a : Ω), X 0 a))
state_after: case h.e'_3
Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
ω : Ω
hωpos : Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
hωneg : Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ (fun n => (∑ i ∈ range n, X i ω) / ↑n) = fun x =>
    (∑ i ∈ range x, (pos ∘ X i) ω) / ↑x - (∑ i ∈ range x, (neg ∘ X i) ω) / ↑x

case h.e'_5
Ω : Type u_1
inst✝¹ : MeasureSpace Ω
inst✝ : IsProbabilityMeasure ℙ
X : ℕ → Ω → ℝ
hint : Integrable (X 0) ℙ
hindep : Pairwise fun i j => IndepFun (X i) (X j) ℙ
hident : ∀ (i : ℕ), IdentDistrib (X i) (X 0) ℙ ℙ
pos : ℝ → ℝ := fun x => max x 0
neg : ℝ → ℝ := fun x => max (-x) 0
posm : Measurable pos
negm : Measurable neg
A : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
B : ∀ᵐ (ω : Ω), Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
ω : Ω
hωpos : Tendsto (fun n => (∑ i ∈ range n, (pos ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (pos ∘ X 0) a))
hωneg : Tendsto (fun n => (∑ i ∈ range n, (neg ∘ X i) ω) / ↑n) atTop (𝓝 (∫ (a : Ω), (neg ∘ X 0) a))
⊢ 𝓝 (∫ (a : Ω), X 0 a) = 𝓝 ((∫ (a : Ω), (pos ∘ X 0) a) - ∫ (a : Ω), (neg ∘ X 0) a)
tactic: convert hωpos.sub hωneg using 1