mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i✝ : ι
hn : x ∈ D n i✝
this : D n i✝ ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i✝
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
m : ℕ
hm : n + k + 1 ≤ m
i : ι
⊢ Disjoint (D m i) B

Tactic:
by

Goal state after:
Module: Mathlib.Topology.PartitionOfUnity

Goal state before:
pp: X : Type v
inst✝² : TopologicalSpace X
inst✝¹ : T2Space X
inst✝ : LocallyCompactSpace X
n : ℕ
t : Set X
s : Fin n → Set X
hs : ∀ (i : Fin n), IsOpen[inst✝²] (s i)
htcp : IsCompact t
hst : t ⊆ ⋃ i, s i
⊢ ∃ f,
    (∀ (i : Fin n), tsupport ⇑(f i) ⊆ s i) ∧
      EqOn (∑ i, ⇑(f i)) 1 t ∧ (∀ (i : Fin n) (x : X), (f i) x ∈ Icc 0 1) ∧ ∀ (i : Fin n), HasCompactSupport ⇑(f i)

Tactic:
by

Goal state after:
Module: Mathlib.Topology.MetricSpace.PartitionOfUnity

Goal state before:
pp: ι : Type u_1
X : Type u_2
inst✝ : MetricSpace X
K U : ι → Set X
hK : ∀ (i : ι), IsClosed[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (K i)
hU : ∀ (i : ι), IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] (U i)
hKU : ∀ (i : ι), K i ⊆ U i
hfin : LocallyFinite K
⊢ ∃ δ, (∀ (x : X), 0 < δ x) ∧ ∀ (i : ι), ∀ x ∈ K i, closedBall x ↑(δ x) ⊆ U i

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁶ : NormedAddCommGroup E
inst✝⁵ : NormedSpace ℝ E
F : Type uF
inst✝⁴ : NormedAddCommGroup F
inst✝³ : NormedSpace ℝ F
H : Type uH
inst✝² : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace H M
s✝ : Set M
f✝ : SmoothPartitionOfUnity ι I M s✝
n : ℕ∞
s : Set M
f g : SmoothPartitionOfUnity ι I M s
h : f.toFun = g.toFun
⊢ f = g

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
H : Type uH
inst✝² : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace H M
s : Set M
f : SmoothPartitionOfUnity ι I M s
x : M
hx : x ∈ s
⊢ ∃ i, 0 < (f i) x

Tactic:
by

Goal state after:
Module: Mathlib.MeasureTheory.Function.StronglyMeasurable.Lp

Goal state before:
pp: α : Type u_1
G : Type u_2
p : ℝ≥0∞
m0 : MeasurableSpace α
μ : Measure α
inst✝ : NormedAddCommGroup G
f : α → G
hf : MemLp f p μ
hf_meas : StronglyMeasurable f
hp_ne_zero : p ≠ 0
hp_ne_top : p ≠ ∞
this✝¹ : MeasurableSpace G := borel G
this✝ : BorelSpace G
this : SeparableSpace ↑(Set.range f ∪ {0})
⊢ 0 ∈ Set.range f ∪ {0}

Tactic:
by

Goal state after:
Module: Mathlib.MeasureTheory.Function.StronglyMeasurable.Lp

Goal state before:
pp: case refine_1
α : Type u_1
G : Type u_2
p : ℝ≥0∞
m0 : MeasurableSpace α
μ : Measure α
inst✝ : NormedAddCommGroup G
f : α → G
hf : MemLp f p μ
hf_meas : StronglyMeasurable f
hp_ne_zero : p ≠ 0
hp_ne_top : p ≠ ∞
this✝¹ : MeasurableSpace G := borel G
this✝ : BorelSpace G
this : SeparableSpace ↑(Set.range f ∪ {0})
fs : ℕ → α →ₛ G := SimpleFunc.approxOn f ⋯ (Set.range f ∪ {0}) 0 ⋯
h_fs_Lp : ∀ (n : ℕ), MemLp (⇑(fs n)) p μ
⊢ ∀ (n : ℕ), μ (support ⇑(fs n)) < ∞

Tactic:
exact fun n => (fs n).measure_support_lt_top_of_memLp (h_fs_Lp n) hp_ne_zero hp_ne_top

Goal state after:
Module: Mathlib.MeasureTheory.Function.StronglyMeasurable.Lp

Goal state before:
pp: α : Type u_1
G : Type u_2
p : ℝ≥0∞
m0 : MeasurableSpace α
μ : Measure α
inst✝ : NormedAddCommGroup G
f : α → G
hf : MemLp f p μ
hf_meas : StronglyMeasurable f
hp_ne_zero : p ≠ 0
hp_ne_top : p ≠ ∞
⊢ FinStronglyMeasurable f μ

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁶ : NormedAddCommGroup E
inst✝⁵ : NormedSpace ℝ E
F : Type uF
inst✝⁴ : NormedAddCommGroup F
inst✝³ : NormedSpace ℝ F
H : Type uH
inst✝² : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace H M
s : Set M
f : SmoothPartitionOfUnity ι I M s
n : ℕ∞
x₀ : M
g : ι → M → F
hφ : ∀ (i : ι), x₀ ∈ tsupport ⇑(f i) → ContMDiffAt I 𝓘(ℝ, F) (↑n) (g i) x₀
⊢ ContMDiffAt I 𝓘(ℝ, F) (↑n) (fun x ↦ ∑ᶠ (i : ι), (f i) x • g i x) x₀

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝³ : NormedAddCommGroup E
inst✝² : NormedSpace ℝ E
F : Type uF
inst✝¹ : NormedAddCommGroup F
inst✝ : NormedSpace ℝ F
n : ℕ∞
s : Set E
f : SmoothPartitionOfUnity ι 𝓘(ℝ, E) E s
x₀ : E
g : ι → E → F
hφ : ∀ (i : ι), x₀ ∈ tsupport ⇑(f i) → ContDiffAt ℝ (↑n) (g i) x₀
⊢ ContDiffAt ℝ (↑n) (fun x ↦ ∑ᶠ (i : ι), (f i) x • g i x) x₀

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
H : Type uH
inst✝² : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝¹ : TopologicalSpace M
inst✝ : ChartedSpace H M
s : Set M
f : BumpCovering ι M s
hf : ∀ (i : ι), ContMDiff I 𝓘(ℝ, ℝ) ∞ ⇑(f i)
i : ι
⊢ LocallyFinite fun i ↦ mulSupport fun x ↦ 1 - (f i) x

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i : ι
hn : x ∈ D n i
this : D n i ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
Hgt : ∀ (m : ℕ), n + k + 1 ≤ m → ∀ (i : ι), Disjoint (D m i) B
m : ℕ
hm : m ≤ n + k
y : α
hyB : y ∈ B
z : α
hzB : z ∈ B
y' : α
hyD : y ∈ D m (ind y')
hsuby : eball y' (3 * 2⁻¹ ^ m) ⊆ s (ind y')
hdisty : edist y y' < 2⁻¹ ^ m
z' : α
hzD : z ∈ D m (ind z')
h' : ind y' ≠ ind z'
h : ind y' < ind z'
hdistz : edist z z' < 2⁻¹ ^ m
⊢ edist z z' + edist z x + (edist y x + edist y y') < 2⁻¹ ^ m + 2⁻¹ ^ (n + k + 1) + (2⁻¹ ^ (n + k + 1) + 2⁻¹ ^ m)

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i : ι
hn : x ∈ D n i
this : D n i ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
Hgt : ∀ (m : ℕ), n + k + 1 ≤ m → ∀ (i : ι), Disjoint (D m i) B
m : ℕ
hm : m ≤ n + k
y : α
hyB : y ∈ B
z : α
hzB : z ∈ B
y' : α
hyD : y ∈ D m (ind y')
hsuby : eball y' (3 * 2⁻¹ ^ m) ⊆ s (ind y')
hdisty : edist y y' < 2⁻¹ ^ m
z' : α
hzD : z ∈ D m (ind z')
h' : ind y' ≠ ind z'
h : ind y' < ind z'
hdistz : edist z z' < 2⁻¹ ^ m
⊢ 2⁻¹ ^ m + 2⁻¹ ^ (n + k + 1) + (2⁻¹ ^ (n + k + 1) + 2⁻¹ ^ m) = 2 * (2⁻¹ ^ m + 2⁻¹ ^ (n + k + 1))

Tactic:
by

Goal state after:
Module: Mathlib.Order.Filter.Germ.OrderedMonoid

Goal state before:
pp: α : Type u_1
β : Type u_2
l : Filter α
inst✝² : CommMonoid β
inst✝¹ : Preorder β
inst✝ : IsOrderedMonoid β
f g : l.Germ β
x✝³ x✝² : α → β
H✝ : ↑x✝³ ≤ ↑x✝²
h : l.Germ β
x✝¹ : α → β
x✝ : α
H : x✝³ x✝ ≤ x✝² x✝
⊢ (fun f g x ↦ (fun x1 x2 ↦ x1 * x2) (f x) (g x)) x✝³ x✝¹ x✝ ≤
    (fun f g x ↦ (fun x1 x2 ↦ x1 * x2) (f x) (g x)) x✝² x✝¹ x✝

Tactic:
by

Goal state after:
Module: Mathlib.Topology.ShrinkingLemma

Goal state before:
pp: ι : Type u_1
X : Type u_2
inst✝² : TopologicalSpace X
u : ι → Set X
s : Set X
inst✝¹ : T2Space X
inst✝ : LocallyCompactSpace X
v : PartialRefinement u s fun w ↦ IsCompact (closure w)
hs : IsCompact s
i : ι
hi : i ∉ v.carrier
⊢ ∃ v', v < v' ∧ IsCompact (closure (v'.toFun i))

Tactic:
by

Goal state after:
Module: Mathlib.Order.Filter.Ring

Goal state before:
pp: α : Type u
β : Type v
inst✝³ : MulZeroClass β
inst✝² : Preorder β
inst✝¹ : PosMulMono β
inst✝ : MulPosMono β
l : Filter α
f₁ f₂ g₁ g₂ : α → β
hf : f₁ ≤ᶠ[l] f₂
hg : g₁ ≤ᶠ[l] g₂
hg₀ : 0 ≤ᶠ[l] g₁
hf₀ : 0 ≤ᶠ[l] f₂
⊢ f₁ * g₁ ≤ᶠ[l] f₂ * g₂

Tactic:
by

Goal state after:
Module: Mathlib.Order.Filter.Ring

Goal state before:
pp: α : Type u
β : Type v
inst✝³ : Mul β
inst✝² : Preorder β
inst✝¹ : MulLeftMono β
inst✝ : MulRightMono β
l : Filter α
f₁ f₂ g₁ g₂ : α → β
hf : f₁ ≤ᶠ[l] f₂
hg : g₁ ≤ᶠ[l] g₂
⊢ f₁ * g₁ ≤ᶠ[l] f₂ * g₂

Tactic:
by

Goal state after:
Module: Mathlib.Order.Filter.Ring

Goal state before:
pp: α : Type u
β : Type v
inst✝² : Semiring β
inst✝¹ : PartialOrder β
inst✝ : IsOrderedRing β
l : Filter α
f g : α → β
hf : 0 ≤ᶠ[l] f
hg : 0 ≤ᶠ[l] g
⊢ 0 ≤ᶠ[l] f * g

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i : ι
hn : x ∈ D n i
this : D n i ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
Hgt : ∀ (m : ℕ), n + k + 1 ≤ m → ∀ (i : ι), Disjoint (D m i) B
m : ℕ
hm : m ≤ n + k
y : α
hyB : y ∈ B
z : α
hzB : z ∈ B
y' : α
hyD : y ∈ D m (ind y')
hsuby : eball y' (3 * 2⁻¹ ^ m) ⊆ s (ind y')
hdisty : edist y y' < 2⁻¹ ^ m
z' : α
hzD : z ∈ D m (ind z')
h' : ind y' ≠ ind z'
h : ind y' < ind z'
hdistz : edist z z' < 2⁻¹ ^ m
⊢ 2 * (2⁻¹ ^ m + 2⁻¹ ^ (n + k + 1)) ≤ 2 * (2⁻¹ ^ m + 2⁻¹ ^ (m + 1))

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: E : Type uE
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
H : Type uH
inst✝⁵ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝⁴ : TopologicalSpace M
inst✝³ : ChartedSpace H M
inst✝² : FiniteDimensional ℝ E
s : Set M
U : M → Set M
inst✝¹ : T2Space M
inst✝ : SigmaCompactSpace M
hs : IsClosed[inst✝⁴] s
hU : ∀ x ∈ s, U x ∈ 𝓝 x
⊢ ∃ ι f, f.IsSubordinate U

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
H : Type uH
inst✝³ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝² : TopologicalSpace M
inst✝¹ : ChartedSpace H M
inst✝ : FiniteDimensional ℝ E
s : Set M
fs : SmoothBumpCovering ι I M s
x : M
hx : x ∈ s
⊢ x ∈ support ↑(fs.toFun (fs.ind x hx))

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
H : Type uH
inst✝³ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝² : TopologicalSpace M
inst✝¹ : ChartedSpace H M
inst✝ : FiniteDimensional ℝ E
s : Set M
fs : SmoothBumpCovering ι I M s
i : ι
x : M
h : ↑(fs.toFun i) x = 1
⊢ x ∈ support ↑(fs.toFun i)

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
H : Type uH
inst✝³ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝² : TopologicalSpace M
inst✝¹ : ChartedSpace H M
inst✝ : FiniteDimensional ℝ E
s : Set M
fs : SmoothBumpCovering ι I M s
i : ι
x : M
h : ↑(fs.toFun i) x = 1
⊢ x ∈ (extChartAt I (fs.c i)).source

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: ι : Type uι
E : Type uE
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
H : Type uH
inst✝⁵ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝⁴ : TopologicalSpace M
inst✝³ : ChartedSpace H M
inst✝² : FiniteDimensional ℝ E
s : Set M
fs : SmoothBumpCovering ι I M s
inst✝¹ : T2Space M
inst✝ : IsManifold I ∞ M
i : ι
x : M
⊢ ∃ t, ⇑(fs.toSmoothPartitionOfUnity i) =ᶠ[𝓝 x] ↑(fs.toFun i) * ∏ j ∈ t with WellOrderingRel j i, (1 - ↑(fs.toFun j))

Tactic:
by

Goal state after:
Module: Mathlib.Topology.ShrinkingLemma

Goal state before:
pp: ι : Type u_1
X : Type u_2
inst✝² : TopologicalSpace X
u : ι → Set X
s : Set X
inst✝¹ : T2Space X
inst✝ : LocallyCompactSpace X
hs : IsCompact s
uo : ∀ (i : ι), IsOpen (u i)
uf : ∀ x ∈ s, {i | x ∈ u i}.Finite
us : s ⊆ ⋃ i, u i
⊢ ∃ v,
    s ⊆ iUnion v ∧ (∀ (i : ι), IsOpen (v i)) ∧ (∀ (i : ι), closure (v i) ⊆ u i) ∧ ∀ (i : ι), IsCompact (closure (v i))

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: E : Type uE
inst✝⁸ : NormedAddCommGroup E
inst✝⁷ : NormedSpace ℝ E
H : Type uH
inst✝⁶ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝⁵ : TopologicalSpace M
inst✝⁴ : ChartedSpace H M
inst✝³ : FiniteDimensional ℝ E
inst✝² : IsManifold I ∞ M
n : ℕ∞
inst✝¹ : T2Space M
inst✝ : SigmaCompactSpace M
s t : Set M
hs : IsClosed[inst✝⁵] s
ht : IsClosed[inst✝⁵] t
hd : Disjoint s t
this : ∀ x ∈ t, sᶜ ∈ 𝓝 x
ι : Type uM
f : SmoothBumpCovering ι I M t
hf : f.IsSubordinate fun x ↦ sᶜ
g : SmoothPartitionOfUnity ι I M t := f.toSmoothPartitionOfUnity
⊢ ↑n ≤ ∞

Tactic:
by

Goal state after:
Module: Mathlib.Topology.ShrinkingLemma

Goal state before:
pp: ι : Type u_1
X : Type u_2
inst✝² : TopologicalSpace X
u : ι → Set X
s : Set X
inst✝¹ : T2Space X
inst✝ : LocallyCompactSpace X
hs : IsCompact s
uo : ∀ (i : ι), IsOpen (u i)
uf : ∀ x ∈ s, {i | x ∈ u i}.Finite
us : s ⊆ ⋃ i, u i
⊢ ∃ v, s ⊆ iUnion v ∧ (∀ (i : ι), IsClosed (v i)) ∧ (∀ (i : ι), v i ⊆ u i) ∧ ∀ (i : ι), IsCompact (v i)

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: E : Type uE
inst✝⁸ : NormedAddCommGroup E
inst✝⁷ : NormedSpace ℝ E
H : Type uH
inst✝⁶ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝⁵ : TopologicalSpace M
inst✝⁴ : ChartedSpace H M
inst✝³ : FiniteDimensional ℝ E
inst✝² : IsManifold I ∞ M
n : ℕ∞
inst✝¹ : T2Space M
inst✝ : SigmaCompactSpace M
s t : Set M
hs : IsClosed[inst✝⁵] s
ht : IsClosed[inst✝⁵] t
hd : Disjoint s t
this✝ : ∀ x ∈ t, sᶜ ∈ 𝓝 x
ι : Type uM
f : SmoothBumpCovering ι I M t
hf : f.IsSubordinate fun x ↦ sᶜ
g : SmoothPartitionOfUnity ι I M t := f.toSmoothPartitionOfUnity
x : M
hx : x ∈ s
this : ∀ (i : ι), (g i) x = 0
⊢ ⟨fun x ↦ ∑ᶠ (i : ι), (g i) x, ⋯⟩ x = 0 x

Tactic:
by

Goal state after:
Module: Mathlib.Geometry.Manifold.PartitionOfUnity

Goal state before:
pp: E : Type uE
inst✝⁸ : NormedAddCommGroup E
inst✝⁷ : NormedSpace ℝ E
H : Type uH
inst✝⁶ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type uM
inst✝⁵ : TopologicalSpace M
inst✝⁴ : ChartedSpace H M
inst✝³ : FiniteDimensional ℝ E
inst✝² : IsManifold I ∞ M
n : ℕ∞
inst✝¹ : T2Space M
inst✝ : SigmaCompactSpace M
s t : Set M
hs : IsClosed[inst✝⁵] s
ht : IsClosed[inst✝⁵] t
hd : Disjoint s t
⊢ ∃ f, EqOn (⇑f) 0 s ∧ EqOn (⇑f) 1 t ∧ ∀ (x : M), f x ∈ Icc 0 1

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i : ι
hn : x ∈ D n i
this : D n i ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
Hgt : ∀ (m : ℕ), n + k + 1 ≤ m → ∀ (i : ι), Disjoint (D m i) B
m : ℕ
hm : m ≤ n + k
y : α
hyB : y ∈ B
z : α
hzB : z ∈ B
y' : α
hyD : y ∈ D m (ind y')
hsuby : eball y' (3 * 2⁻¹ ^ m) ⊆ s (ind y')
hdisty : edist y y' < 2⁻¹ ^ m
z' : α
hzD : z ∈ D m (ind z')
h' : ind y' ≠ ind z'
h : ind y' < ind z'
hdistz : edist z z' < 2⁻¹ ^ m
⊢ 2 * (2⁻¹ ^ m + 2⁻¹ ^ (m + 1)) = 3 * 2⁻¹ ^ m

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
pow_pos : ∀ (k : ℕ), 0 < 2⁻¹ ^ k
hpow_le : ∀ {m n : ℕ}, m ≤ n → 2⁻¹ ^ n ≤ 2⁻¹ ^ m
h2pow : ∀ (n : ℕ), 2 * 2⁻¹ ^ (n + 1) = 2⁻¹ ^ n
ι : Type u_1
s : ι → Set α
ho : ∀ (a : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (s a)
hcov : ∀ (x : α), ∃ i, x ∈ s i
w✝ : LinearOrder ι
wf : WellFoundedLT ι
ind : α → ι := fun x ↦ ⋯.min {i | x ∈ s i} ⋯
mem_ind : ∀ (x : α), x ∈ s (ind x)
notMem_of_lt_ind : ∀ {x : α} {i : ι}, i < ind x → x ∈ s i → False
D : ℕ → ι → Set α :=
  fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
hD :
  D = fun t ↦
    Nat.strongRec (motive := fun x ↦ ι → Set α)
      (fun n D' i ↦
        ⋃ x,
          ⋃ (_ : ind x = i),
            ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ (m : ℕ) (H : m < n) (j : ι), x ∉ D' m H j), eball x (2⁻¹ ^ n))
      t
Dn :
  ∀ (n : ℕ) (i : ι),
    D n i =
      ⋃ x,
        ⋃ (_ : ind x = i), ⋃ (_ : eball x (3 * 2⁻¹ ^ n) ⊆ s i), ⋃ (_ : ∀ m < n, ∀ (j : ι), x ∉ D m j), eball x (2⁻¹ ^ n)
memD :
  ∀ {n : ℕ} {i : ι} {y : α},
    y ∈ D n i ↔ ∃ x, ind x = i ∧ eball x (3 * 2⁻¹ ^ n) ⊆ s i ∧ (∀ m < n, ∀ (j : ι), x ∉ D m j) ∧ edist y x < 2⁻¹ ^ n
Dcov : ∀ (x : α), ∃ n i, x ∈ D n i
Dopen : ∀ (n : ℕ) (i : ι), IsOpen[PseudoEMetricSpace.toUniformSpace.toTopologicalSpace] (D n i)
HDS : ∀ (n : ℕ) (i : ι), D n i ⊆ s i
x : α
n : ℕ
i : ι
hn : x ∈ D n i
this : D n i ∈ 𝓝 x
k : ℕ
hsub : eball x (2⁻¹ ^ k) ⊆ D n i
B : Set α := eball x (2⁻¹ ^ (n + k + 1))
Hgt : ∀ (m : ℕ), n + k + 1 ≤ m → ∀ (i : ι), Disjoint (D m i) B
m : ℕ
hm : m ≤ n + k
⊢ {j | (D m j ∩ B).Nonempty}.Subsingleton

Tactic:
by

Goal state after:
Module: Mathlib.Topology.EMetricSpace.Paracompact

Goal state before:
pp: α : Type u_1
inst✝ : PseudoEMetricSpace α
⊢ ParacompactSpace α

Tactic:
by

Goal state after: