Theorem: MeasureTheory.VectorMeasure.restrict_le_restrict_iUnion
File: Mathlib/MeasureTheory/Measure/VectorMeasure.lean

Proof steps:
state_before: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
⊢ v.restrict (⋃ n, f n) ≤ w.restrict (⋃ n, f n)
state_after: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
⊢ ↑v a ≤ ↑w a
tactic: refine restrict_le_restrict_of_subset_le v w fun a ha₁ ha₂ => ?_
state_before: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
⊢ ↑v a ≤ ↑w a
state_after: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
⊢ ↑v a ≤ ↑w a
tactic: have ha₃ : ⋃ n, a ∩ disjointed f n = a := by
    rwa [← Set.inter_iUnion, iUnion_disjointed, Set.inter_eq_left]
state_before: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
⊢ ↑v a ≤ ↑w a
state_after: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n)
⊢ ↑v a ≤ ↑w a
tactic: have ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n) :=
    (disjoint_disjointed _).mono fun i j => Disjoint.mono inf_le_right inf_le_right
state_before: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n)
⊢ ↑v a ≤ ↑w a
state_after: α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n)
⊢ ∑' (i : ℕ), ↑v (a ∩ disjointed f i) ≤ ∑' (i : ℕ), ↑w (a ∩ disjointed f i)

α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n)
⊢ ∀ (i : ℕ), MeasurableSet (a ∩ disjointed f i)

α : Type u_1
β : Type u_2
m : MeasurableSpace α
M : Type u_3
inst✝² : TopologicalSpace M
inst✝¹ : OrderedAddCommMonoid M
inst✝ : OrderClosedTopology M
v w : VectorMeasure α M
i j : Set α
f : ℕ → Set α
hf₁ : ∀ (n : ℕ), MeasurableSet (f n)
hf₂ : ∀ (n : ℕ), v.restrict (f n) ≤ w.restrict (f n)
a : Set α
ha₁ : MeasurableSet a
ha₂ : a ⊆ ⋃ n, f n
ha₃ : ⋃ n, a ∩ disjointed f n = a
ha₄ : Pairwise (Disjoint on fun n => a ∩ disjointed f n)
⊢ ∀ (i : ℕ), MeasurableSet (a ∩ disjointed f i)
tactic: rw [← ha₃, v.of_disjoint_iUnion_nat _ ha₄, w.of_disjoint_iUnion_nat _ ha₄]