awhecmu/canonical-drafter-extract-mathlib huggingface dataset:
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
obtain :
  ∀ (u : Set α) (su : u ⊇ s) (u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u)
    (μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
obtain ⟨u, su, u_open, μu⟩ : ∃ U, U ⊇ s ∧ IsOpen U ∧ μ U ≤ μ s + ε / 2 :=
    Set.exists_isOpen_le_add _ _
      (by
        simpa only [or_false, Ne, ENNReal.div_eq_zero_iff, ENNReal.ofNat_ne_top] using hε)

Premises used: Set.exists_isOpen_le_add, DFunLike.coe
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
⊢ ∀ x ∈ s, ∃ R > 0, ball x R ⊆ u

Tactic:
have : ∀ x ∈ s, ∃ R > 0, ball x R ⊆ u := fun x hx =>
    Metric.mem_nhds_iff.1 (u_open.mem_nhds (su hx))
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
this : ∀ x ∈ s, ∃ R > 0, ball x R ⊆ u
choose! :
  ∀ (R : (x : α) → ℝ) (hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
choose! R hR using this

Premises used: Besicovitch.TauPackage.R
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
⊢ ∃ (t0 : Set α) (r0 : α → ℝ),
    t0.Countable ∧
      t0 ⊆ s ∧
        (∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)) ∧
          Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞) ∧
            t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)

Tactic:
exists_disjoint_closedBall_covering_ae μ f s hf R fun x hx => (hR x hx).1

Premises used: And.left, Besicovitch.exists_disjoint_closedBall_covering_ae
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
obtain :
  ∀ (t0 : Set α) (r0 : α → ℝ) (t0_count : t0.Countable) (t0s : t0 ⊆ s) (hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x))
    (μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞))
    (t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
obtain ⟨t0, r0, t0_count, t0s, hr0, μt0, t0_disj⟩ :
    ∃ (t0 : Set α) (r0 : α → ℝ), t0.Countable ∧ t0 ⊆ s ∧
      (∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)) ∧ μ (s \ ⋃ x ∈ t0, closedBall x (r0 x)) = 0 ∧
        t0.PairwiseDisjoint fun x => closedBall x (r0 x) :=
    exists_disjoint_closedBall_covering_ae μ f s hf R fun x hx => (hR x hx).1

Premises used: And.left, Besicovitch.exists_disjoint_closedBall_covering_ae, Set
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
⊢ s' ⊆ s

Tactic:
have s's : s' ⊆ s := diff_subset
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
⊢ ∃ (N : ℕ) (τ : ℝ), 1 < τ ∧ IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)

Tactic:
HasBesicovitchCovering.no_satelliteConfig

Premises used: HasBesicovitchCovering.no_satelliteConfig
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
obtain :
  ∀ (N : ℕ) (τ : ℝ) (hτ : 1 < τ) (H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
obtain ⟨N, τ, hτ, H⟩ : ∃ N τ, 1 < τ ∧ IsEmpty (Besicovitch.SatelliteConfig α N τ) :=
    HasBesicovitchCovering.no_satelliteConfig

Premises used: Besicovitch.TauPackage.τ, HasBesicovitchCovering.no_satelliteConfig
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
⊢ ε / 2 / (↑N : ℝ≥0∞) ≠ 0

Tactic:
simp only [ne_eq, ENNReal.div_eq_zero_iff, hε, ENNReal.ofNat_ne_top, or_self,
          ENNReal.natCast_ne_top, not_false_eq_true]

Premises used: ENNReal.ofNat_ne_top, ENNReal.natCast_ne_top, ne_eq, ENNReal.div_eq_zero_iff, or_self, not_false_eq_true
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
obtain :
  ∀ (v : Set α) (s'v : v ⊇ s') (v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v)
    (μv :
      (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
obtain ⟨v, s'v, v_open, μv⟩ : ∃ v, v ⊇ s' ∧ IsOpen v ∧ μ v ≤ μ s' + ε / 2 / N :=
    Set.exists_isOpen_le_add _ _
      (by simp only [ne_eq, ENNReal.div_eq_zero_iff, hε, ENNReal.ofNat_ne_top, or_self,
          ENNReal.natCast_ne_top, not_false_eq_true])

Premises used: Set.exists_isOpen_le_add, DFunLike.coe
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
x : α
hx : x ∈ s'
rcases : ∀ (r : ℝ) (rpos : r > 0) (hr : ball x r ⊆ v), ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v
⊢ ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v

Tactic:
rcases Metric.mem_nhds_iff.1 (v_open.mem_nhds (s'v hx)) with ⟨r, rpos, hr⟩

Premises used: Metric.mem_nhds_iff, IsOpen.mem_nhds, Iff.mp
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
x : α
hx : x ∈ s'
r : ℝ
rpos : r > 0
hr : ball x r ⊆ v
rcases : ∀ (R' : ℝ) (hR' : R' ∈ f x ∩ Ioo 0 (min r 1)), ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v
⊢ ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v

Tactic:
rcases hf x (s's hx) (min r 1) (lt_min rpos zero_lt_one) with ⟨R', hR'⟩

Premises used: lt_min, zero_lt_one, OfNat.ofNat, Min.min
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
x : α
hx : x ∈ s'
r : ℝ
rpos : r > 0
hr : ball x r ⊆ v
R' : ℝ
hR' : R' ∈ f x ∩ Ioo 0 (min r 1)
⊢ ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v

Tactic:
⟨R', ⟨hR'.1, hR'.2.1, hR'.2.2.trans_le (min_le_right _ _)⟩,
        Subset.trans (closedBall_subset_ball (hR'.2.2.trans_le (min_le_left _ _))) hr⟩

Premises used: Set.Subset.trans, Metric.closedBall_subset_ball, min_le_left, And.right, And.left, LT.lt.trans_le, And.intro, min_le_right, Exists.intro
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
x : α
hx : x ∈ s'
r : ℝ
rpos : r > 0
hr : ball x r ⊆ v
R' : ℝ
hR' : R' ∈ f x ∩ Ioo 0 (min r 1)
⊢ ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v

Tactic:
exact
      ⟨R', ⟨hR'.1, hR'.2.1, hR'.2.2.trans_le (min_le_right _ _)⟩,
        Subset.trans (closedBall_subset_ball (hR'.2.2.trans_le (min_le_left _ _))) hr⟩
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
⊢ ∀ x ∈ s', ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v

Tactic:
have : ∀ x ∈ s', ∃ r1 ∈ f x ∩ Ioo (0 : ℝ) 1, closedBall x r1 ⊆ v := by
    intro x hx
    rcases Metric.mem_nhds_iff.1 (v_open.mem_nhds (s'v hx)) with ⟨r, rpos, hr⟩
    rcases hf x (s's hx) (min r 1) (lt_min rpos zero_lt_one) with ⟨R', hR'⟩
    exact
      ⟨R', ⟨hR'.1, hR'.2.1, hR'.2.2.trans_le (min_le_right _ _)⟩,
        Subset.trans (closedBall_subset_ball (hR'.2.2.trans_le (min_le_left _ _))) hr⟩
-- Module: Mathlib.MeasureTheory.Covering.Besicovitch
Goal:
α : Type u_1
inst : MetricSpace α
inst_1 : SecondCountableTopology α
inst_2 : MeasurableSpace α
inst_3 : OpensMeasurableSpace α
inst_4 : HasBesicovitchCovering α
μ : Measure α
inst_5 : SFinite μ
inst_6 : μ.OuterRegular
ε : ℝ≥0∞
hε : ε ≠ 0
f : α → Set ℝ
s : Set α
hf : ∀ x ∈ s, ∀ δ > 0, (f x ∩ Ioo 0 δ).Nonempty
u : Set α
su : u ⊇ s
u_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] u
μu : (μ : (a : Set α) → ℝ≥0∞) u ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) (ε / 2)
R : (x : α) → ℝ
hR : ∀ x ∈ s, R x > 0 ∧ ball x (R x) ⊆ u
t0 : Set α
r0 : α → ℝ
t0_count : t0.Countable
t0s : t0 ⊆ s
hr0 : ∀ x ∈ t0, r0 x ∈ f x ∩ Ioo 0 (R x)
μt0 : Eq (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) (s \ ⋃ x ∈ t0, closedBall x (r0 x)) : ℝ≥0∞) (0 : ℝ≥0∞)
t0_disj : t0.PairwiseDisjoint (α := Set α) fun (x : α) ↦ closedBall x (r0 x)
s' : Set α := s \ ⋃ x ∈ t0, closedBall x (r0 x)
s's : s' ⊆ s
N : ℕ
τ : ℝ
hτ : 1 < τ
H : IsEmpty.{u_1 + 1} (SatelliteConfig α N τ)
v : Set α
s'v : v ⊇ s'
v_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] v
μv : (μ : (a : Set α) → ℝ≥0∞) v ≤ HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s' : ℝ≥0∞) (ε / 2 / (↑N : ℝ≥0∞))
this : ∀ x ∈ s', ∃ r1 ∈ f x ∩ Ioo 0 1, closedBall x r1 ⊆ v
choose! :
  ∀ (r1 : (x : α) → ℝ) (hr1 : ∀ x ∈ s', r1 x ∈ f x ∩ Ioo 0 1 ∧ closedBall x (r1 x) ⊆ v),
    ∃ (t : Set α) (r : α → ℝ),
      t.Countable ∧
        t ⊆ s ∧
          (∀ x ∈ t, r x ∈ f x) ∧
            s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
              ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
                HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε
⊢ ∃ (t : Set α) (r : α → ℝ),
    t.Countable ∧
      t ⊆ s ∧
        (∀ x ∈ t, r x ∈ f x) ∧
          s ⊆ ⋃ x ∈ t, closedBall x (r x) ∧
            ∑' (x : (↑t : Type u_1)), (μ : (a : Set α) → ℝ≥0∞) (closedBall (↑x : α) (r (↑x : α))) ≤
              HAdd.hAdd (α := ℝ≥0∞) ((μ : (a : Set α) → ℝ≥0∞) s : ℝ≥0∞) ε

Tactic:
choose! r1 hr1 using this