awhecmu/canonical-drafter-extract-mathlib huggingface dataset:
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'w : b' ∈ w
b'k : B (↑b' : ι) ⊆ k
⊢ r a ≤ d

Tactic:
ad.trans (min_le_left _ _)

Premises used: min_le_left, LE.le.trans
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'w : b' ∈ w
b'k : B (↑b' : ι) ⊆ k
⊢ r a ≤ d

Tactic:
exact ad.trans (min_le_left _ _)

Premises used: min_le_left, LE.le.trans
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'w : b' ∈ w
b'k : B (↑b' : ι) ⊆ k
⊢ (ball x (R x) \ k ∩ k).Nonempty

Tactic:
have : (ball x (R x) \ k ∩ k).Nonempty := by
        apply ab.mono (inter_subset_inter _ b'k)
        refine ((hB _ hat).trans ?_).trans hd
        gcongr
        exact ad.trans (min_le_left _ _)
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this_1 : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'w : b' ∈ w
b'k : B (↑b' : ι) ⊆ k
this : (ball x (R x) \ k ∩ k).Nonempty
⊢ False

Tactic:
simpa only [diff_inter_self, Set.not_nonempty_empty]

Premises used: Set.not_nonempty_empty, Set.diff_inter_self
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
⊢ b' ∉ w

Tactic:
have b'_notmem_w : b' ∉ w := by
      intro b'w
      have b'k : B b' ⊆ k := @Finset.subset_set_biUnion_of_mem _ _ _ (fun y : v => B y) _ b'w
      have : (ball x (R x) \ k ∩ k).Nonempty := by
        apply ab.mono (inter_subset_inter _ b'k)
        refine ((hB _ hat).trans ?_).trans hd
        gcongr
        exact ad.trans (min_le_left _ _)
      simpa only [diff_inter_self, Set.not_nonempty_empty]
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'_notmem_w : b' ∉ w
b'' : { a : (↑v : Type u_2) // a ∉ w } := Subtype.mk (p := fun (a : (↑v : Type u_2)) ↦ a ∉ w) b' b'_notmem_w
rcases : ∀ (e : α) (ea : e ∈ B a) (eb : e ∈ B b), c a ∈ closedBall (c b) (3 * r b)
⊢ c a ∈ closedBall (c b) (3 * r b)

Tactic:
rcases ab with ⟨e, ⟨ea, eb⟩⟩
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'_notmem_w : b' ∉ w
b'' : { a : (↑v : Type u_2) // a ∉ w } := Subtype.mk (p := fun (a : (↑v : Type u_2)) ↦ a ∉ w) b' b'_notmem_w
e : α
ea : e ∈ B a
eb : e ∈ B b
⊢ dist (c a) e ≤ r a

Tactic:
have A : dist (c a) e ≤ r a := mem_closedBall'.1 (hB a hat ea)
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'_notmem_w : b' ∉ w
b'' : { a : (↑v : Type u_2) // a ∉ w } := Subtype.mk (p := fun (a : (↑v : Type u_2)) ↦ a ∉ w) b' b'_notmem_w
e : α
ea : e ∈ B a
eb : e ∈ B b
A : dist (c a) e ≤ r a
⊢ dist e (c b) ≤ r b

Tactic:
have B : dist e (c b) ≤ r b := mem_closedBall.1 (hB b (ut bu) eb)
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B_1 : ι → Set α
hB : ∀ a ∈ t, B_1 a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B_1 a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B_1 a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B_1 a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B_1
hu : ∀ a ∈ t', ∃ b ∈ u, (B_1 a ∩ B_1 b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B_1 a
v : Set ι := {a : ι | a ∈ u ∧ (B_1 a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B_1 a ∩ ball x (R x)).Nonempty → B_1 a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B_1 (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B_1 (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B_1 (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B_1 a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B_1 a ⊆ ball x (R x)
b : ι
bu : b ∈ u
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'_notmem_w : b' ∉ w
b'' : { a : (↑v : Type u_2) // a ∉ w } := Subtype.mk (p := fun (a : (↑v : Type u_2)) ↦ a ∉ w) b' b'_notmem_w
e : α
ea : e ∈ B_1 a
eb : e ∈ B_1 b
A : dist (c a) e ≤ r a
B : dist e (c b) ≤ r b
linarith :
  3 * r b < dist (c a) (c b) →
    3 * r b - dist (c a) (c b) + (dist (c a) (c b) - (dist (c a) e + dist e (c b))) + (dist (c a) e - r a) +
          (dist e (c b) - r b) +
        (r a - 2 * r b) =
      0
⊢ dist (c a) (c b) ≤ 3 * r b

Tactic:
linarith only [dist_triangle (c a) e (c b), A, B, bdiam]

Premises used: dist_triangle
-- Module: Mathlib.MeasureTheory.Covering.Vitali
Goal:
α : Type u_1
ι : Type u_2
inst : PseudoMetricSpace α
inst_1 : MeasurableSpace α
inst_2 : OpensMeasurableSpace α
inst_3 : SecondCountableTopology α
μ : Measure α
inst_4 : IsLocallyFiniteMeasure μ
s : Set α
t : Set ι
C : ℝ≥0
r : ι → ℝ
c : ι → α
B : ι → Set α
hB : ∀ a ∈ t, B a ⊆ closedBall (c a) (r a)
μB :
  ∀ a ∈ t,
    (μ : (a : Set α) → ℝ≥0∞) (closedBall (c a) (3 * r a)) ≤
      HMul.hMul (β := ℝ≥0∞) (↑C : ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (B a) : ℝ≥0∞)
ht : ∀ a ∈ t, (interior (B a)).Nonempty
h't : ∀ a ∈ t, IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (B a)
hf : ∀ x ∈ s, ∀ ε > 0, ∃ a ∈ t, r a ≤ ε ∧ c a = x
R : (x : α) → ℝ
hR0 : ∀ (x : α), 0 < R x
hR1 : ∀ (x : α), R x ≤ 1
hRμ : ∀ (x : α), LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x (20 * R x)) : ℝ≥0∞) (∞ : ℝ≥0∞)
t' : Set ι := {a : ι | a ∈ t ∧ r a ≤ R (c a)}
u : Set ι
ut' : u ⊆ t'
u_disj : u.PairwiseDisjoint B
hu : ∀ a ∈ t', ∃ b ∈ u, (B a ∩ B b).Nonempty ∧ r a ≤ 2 * r b
ut : u ⊆ t
u_count : u.Countable
x : α
h : x ∈ s \ ⋃ a ∈ u, B a
v : Set ι := {a : ι | a ∈ u ∧ (B a ∩ ball x (R x)).Nonempty}
vu : v ⊆ u
K : ℝ
μK : LT.lt (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (closedBall x K) : ℝ≥0∞) (∞ : ℝ≥0∞)
hK : ∀ a ∈ u, (B a ∩ ball x (R x)).Nonempty → B a ⊆ closedBall x K
ε : ℝ≥0∞
εpos : 0 < ε
I : LT.lt (α := ℝ≥0∞) (∑' (a : (↑v : Type u_2)), (μ : (a : Set α) → ℝ≥0∞) (B (↑a : ι))) ∞
w : Finset (↑v : Type u_2)
hw :
  ∑' (a : { a : (↑v : Type u_2) // a ∉ w }), (μ : (a : Set α) → ℝ≥0∞) (B (↑(↑a : (↑v : Type u_2)) : ι)) <
    ε / (↑C : ℝ≥0∞)
k : Set α := ⋃ a ∈ w, B (↑a : ι)
k_closed : IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] k
d : ℝ
dpos : 0 < d
a : ι
hat : a ∈ t
hz : c a ∈ (s \ ⋃ a ∈ u, B a) ∩ ball x (R x)
z_notmem_k : c a ∉ k
this : ball x (R x) \ k ∈ 𝓝 (c a)
hd : closedBall (c a) d ⊆ ball x (R x) \ k
ad : r a ≤ min d (R (c a))
ax : B a ⊆ ball x (R x)
b : ι
bu : b ∈ u
ab : (B a ∩ B b).Nonempty
bdiam : r a ≤ 2 * r b
bv : b ∈ v
b' : (↑v : Type u_2) := Subtype.mk (p := fun (x : ι) ↦ x ∈ v) b bv
b'_notmem_w : b' ∉ w
b'' : { a : (↑v : Type u_2) // a ∉ w } := Subtype.mk (p := fun (a : (↑v : Type u_2)) ↦ a ∉ w) b' b'_notmem_w
⊢ c a ∈ closedBall (c b) (3 * r b)

Tactic:
have zb : c a ∈ closedBall (c b) (3 * r b) := by
      rcases ab with ⟨e, ⟨ea, eb⟩⟩
      have A : dist (c a) e ≤ r a := mem_closedBall'.1 (hB a hat ea)
      have B : dist e (c b) ≤ r b := mem_closedBall.1 (hB b (ut bu) eb)
      simp only [mem_closedBall]
      linarith only [dist_triangle (c a) e (c b), A, B, bdiam]