mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Analysis.SpecialFunctions.Complex.Circle

Goal state before:
pp: ⊢ (↑0).toCircle = 1

Tactic:
toCircle_coe,

Goal state after:
⊢ Circle.exp 0 = 1
Module: Mathlib.Analysis.SpecialFunctions.Complex.Circle

Goal state before:
pp: case h
x✝ : ℝ
⊢ (↑(-x✝)).toCircle = (↑x✝).toCircle⁻¹

Tactic:
toCircle_coe,

Goal state after:
case h
x✝ : ℝ
⊢ Circle.exp (-x✝) = (Circle.exp x✝)⁻¹
Module: Mathlib.Analysis.SpecialFunctions.Complex.Circle

Goal state before:
pp: case h
x✝ : ℝ
⊢ ↑(↑(↑x✝).toCircle).arg = ↑x✝

Tactic:
toCircle_coe,

Goal state after:
case h
x✝ : ℝ
⊢ ↑(↑(Circle.exp x✝)).arg = ↑x✝
Module: Mathlib.Analysis.SpecialFunctions.Complex.Circle

Goal state before:
pp: n : ℤ
inst✝ : NeZero n
⊢ IsQuotientCoveringMap (fun x ↦ x ^ n) ↥(zpowGroupHom n).ker

Tactic:
have hn : IsUnit (n : ℝ) := by simpa using NeZero.ne n
  let e := AddCircle.homeomorphCircle one_ne_zero
  refine Topology.IsQuotientMap.isQuotientCoveringMap_of_isDiscrete_ker_monoidHom
    (f := zpowGroupHom (α := Circle) n) ?_ (Set.Finite.isDiscrete <| .of_preimage ?_ e.surjective)
  · refine .of_comp e.continuous (continuous_zpow n) ?_
    convert!
      e.isQuotientMap.comp <|
        IsUnit.isQuotientMap_zsmul (M := ℝ) (QuotientAddGroup.mk' (AddSubgroup.zmultiples (1 : ℝ)))
          isQuotientMap_quotient_mk' n hn
    ext; simp [zpowGroupHom, e, homeomorphCircle_apply, toCircle_zsmul]
  · convert! finite_torsion_of_isSMulRegular_int (1 : ℝ) n fun _ ↦ by simp [NeZero.ne]
    ext
    simp [e, homeomorphCircle_apply, ← toCircle_zsmul, ← (injective_toCircle one_ne_zero).eq_iff]

Goal state after:
Module: Mathlib.Analysis.Normed.Module.Normalize

Goal state before:
pp: V : Type u_1
inst✝¹ : NormedAddCommGroup V
inst✝ : NormedSpace ℝ V
r : ℝ
x : V
⊢ normalize (r • x) = ↑(SignType.sign r) • normalize x

Tactic:
by
  rcases lt_trichotomy 0 r with (h_pos | rfl | h_neg)
  · simp [normalize_smul_of_pos, h_pos]
  · simp
  · simp [normalize_smul_of_neg, h_neg]

Goal state after:
Module: Mathlib.Analysis.CStarAlgebra.Unitary.Span

Goal state before:
pp: A : Type u_1
inst✝² : CStarAlgebra A
inst✝¹ : PartialOrder A
inst✝ : StarOrderedRing A
a : A
ha : IsSelfAdjoint a
ha_norm : ‖a‖ ≤ 1
h✝ : Nontrivial A
⊢ a + I • cfc Real.sqrt (1 - a ^ 2) = a + I • cfc (fun x ↦ √x) (cfc (fun x ↦ 1) a - cfc (fun x ↦ x ^ 2) a)

Tactic:
cfc_pow ..,

Goal state after:
A : Type u_1
inst✝² : CStarAlgebra A
inst✝¹ : PartialOrder A
inst✝ : StarOrderedRing A
a : A
ha : IsSelfAdjoint a
ha_norm : ‖a‖ ≤ 1
h✝ : Nontrivial A
⊢ a + I • cfc Real.sqrt (1 - a ^ 2) = a + I • cfc (fun x ↦ √x) (cfc (fun x ↦ 1) a - cfc (fun x ↦ x) a ^ 2)
Module: Mathlib.LinearAlgebra.AffineSpace.Simplex.Centroid

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : DivisionRing k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
inst✝² : AffineSpace V P
n : ℕ
inst✝¹ : NeZero n
inst✝ : CharZero k
s : Simplex k P n
i : Fin (n + 1)
⊢ ↑n • (s.centroid -ᵥ s.faceOppositeCentroid i) = s.points i -ᵥ s.centroid

Tactic:
← vsub_sub_vsub_cancel_right _ _ (s.points i),

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : DivisionRing k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
inst✝² : AffineSpace V P
n : ℕ
inst✝¹ : NeZero n
inst✝ : CharZero k
s : Simplex k P n
i : Fin (n + 1)
⊢ ↑n • (s.centroid -ᵥ s.points i - (s.faceOppositeCentroid i -ᵥ s.points i)) = s.points i -ᵥ s.centroid
Module: Mathlib.Analysis.Calculus.BumpFunction.Basic

Goal state before:
pp: E : Type u_1
X : Type u_2
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : NormedAddCommGroup X
inst✝¹ : NormedSpace ℝ X
inst✝ : HasContDiffBump E
n : ℕ∞
c g : X → E
s : Set X
f : (x : X) → ContDiffBump (c x)
x : X
hc : ContDiffWithinAt ℝ (↑n) c s x
hr : ContDiffWithinAt ℝ (↑n) (fun x ↦ (f x).rIn) s x
hR : ContDiffWithinAt ℝ (↑n) (fun x ↦ (f x).rOut) s x
hg : ContDiffWithinAt ℝ (↑n) g s x
⊢ ContDiffWithinAt ℝ (↑n) (fun x ↦ ↑(f x) (g x)) s x

Tactic:
change ContDiffWithinAt ℝ n (uncurry (someContDiffBumpBase E).toFun ∘ fun x : X =>
    ((f x).rOut / (f x).rIn, (f x).rIn⁻¹ • (g x - c x))) s x
  refine (((someContDiffBumpBase E).smooth.contDiffAt ?_).of_le
    (mod_cast le_top)).comp_contDiffWithinAt x ?_
  · exact prod_mem_nhds (Ioi_mem_nhds (f x).one_lt_rOut_div_rIn) univ_mem
  · exact (hR.div hr (f x).rIn_pos.ne').prodMk ((hr.inv (f x).rIn_pos.ne').smul (hg.sub hc))

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.FiniteDimensional

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : DivisionRing k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
inst✝² : AffineSpace V P
inst✝¹ : CharZero k
n : ℕ
inst✝ : NeZero n
s : Simplex k P n
i : Fin (n + 1)
⊢ Collinear k {s.points i, s.centroid, s.faceOppositeCentroid i}

Tactic:
by
  apply collinear_insert_of_mem_affineSpan_pair
  have h : s.points i = (-n : k) • (s.faceOppositeCentroid i -ᵥ s.centroid) +ᵥ s.centroid := by
    rw [← neg_vsub_eq_vsub_rev, neg_smul_neg, ← point_vsub_centroid_eq_smul_vsub, vsub_vadd]
  rw [h]
  exact smul_vsub_vadd_mem_affineSpan_pair _ _ _

Goal state after:
Module: Mathlib.Analysis.Normed.Lp.lpSpace

Goal state before:
pp: case refine_1
α : Type u_3
E : α → Type u_4
p : ℝ≥0∞
inst✝ : (i : α) → NormedAddCommGroup (E i)
ι : Type u_5
s : Finset ι
f : ι → (i : α) → E i
this : DecidableEq ι
⊢ (∀ i ∈ ∅, Memℓp (f i) p) → Memℓp (fun a ↦ ∑ i ∈ ∅, f i a) p

Tactic:
simp only [zero_mem_ℓp', Finset.sum_empty, imp_true_iff]

Goal state after:
Module: Mathlib.Analysis.Normed.Lp.lpSpace

Goal state before:
pp: case inr.inl
α : Type u_3
E : α → Type u_4
inst✝ : (i : α) → NormedAddCommGroup (E i)
f : ↥(lp E ∞)
⊢ ‖-f‖ = ‖f‖

pp: case inr.inr
α : Type u_3
E : α → Type u_4
p : ℝ≥0∞
inst✝ : (i : α) → NormedAddCommGroup (E i)
f : ↥(lp E p)
hp : 0 < p.toReal
⊢ ‖-f‖ = ‖f‖

Tactic:
· cases isEmpty_or_nonempty α
    · simp only [lp.eq_zero' f, neg_zero, norm_zero]
    apply (lp.isLUB_norm (-f)).unique
    simpa only [coeFn_neg, Pi.neg_apply, norm_neg] using lp.isLUB_norm f

Goal state after:
case inr.inr
α : Type u_3
E : α → Type u_4
p : ℝ≥0∞
inst✝ : (i : α) → NormedAddCommGroup (E i)
f : ↥(lp E p)
hp : 0 < p.toReal
⊢ ‖-f‖ = ‖f‖
Module: Mathlib.Analysis.Normed.Lp.lpSpace

Goal state before:
pp: case inr.inr
𝕜 : Type u_1
α : Type u_3
E : α → Type u_4
p : ℝ≥0∞
inst✝³ : (i : α) → NormedAddCommGroup (E i)
inst✝² : NormedRing 𝕜
inst✝¹ : (i : α) → Module 𝕜 (E i)
inst✝ : ∀ (i : α), IsBoundedSMul 𝕜 (E i)
hp✝ : p ≠ 0
c : 𝕜
f : ↥(lp E p)
hp : 0 < p.toReal
inst : NNNorm ↥(lp E p)
coe_nnnorm : ∀ (f : ↥(lp E p)), ↑‖f‖₊ = ‖f‖
hRHS : HasSum (fun i ↦ ↑(‖c‖₊ ^ p.toReal * ‖↑f i‖₊ ^ p.toReal)) ↑(‖c‖₊ ^ p.toReal * ‖f‖₊ ^ p.toReal)
hLHS : HasSum (fun i ↦ ↑(‖↑(c • f) i‖₊ ^ p.toReal)) ↑(‖c • f‖₊ ^ p.toReal)
⊢ ‖c • f‖₊ ^ p.toReal ≤ ‖c‖₊ ^ p.toReal * ‖f‖₊ ^ p.toReal

Tactic:
NNReal.hasSum_coe

Goal state after:
case inr.inr
𝕜 : Type u_1
α : Type u_3
E : α → Type u_4
p : ℝ≥0∞
inst✝³ : (i : α) → NormedAddCommGroup (E i)
inst✝² : NormedRing 𝕜
inst✝¹ : (i : α) → Module 𝕜 (E i)
inst✝ : ∀ (i : α), IsBoundedSMul 𝕜 (E i)
hp✝ : p ≠ 0
c : 𝕜
f : ↥(lp E p)
hp : 0 < p.toReal
inst : NNNorm ↥(lp E p)
coe_nnnorm : ∀ (f : ↥(lp E p)), ↑‖f‖₊ = ‖f‖
hRHS : HasSum (fun a ↦ ‖c‖₊ ^ p.toReal * ‖↑f a‖₊ ^ p.toReal) (‖c‖₊ ^ p.toReal * ‖f‖₊ ^ p.toReal)
hLHS : HasSum (fun a ↦ ‖↑(c • f) a‖₊ ^ p.toReal) (‖c • f‖₊ ^ p.toReal)
⊢ ‖c • f‖₊ ^ p.toReal ≤ ‖c‖₊ ^ p.toReal * ‖f‖₊ ^ p.toReal
Module: Mathlib.Analysis.Calculus.UniformLimitsDeriv

Goal state before:
pp: ι : Type u_1
l : Filter ι
E : Type u_2
inst✝⁵ : NormedAddCommGroup E
𝕜 : Type u_3
inst✝⁴ : NontriviallyNormedField 𝕜
inst✝³ : IsRCLikeNormedField 𝕜
inst✝² : NormedSpace 𝕜 E
G : Type u_4
inst✝¹ : NormedAddCommGroup G
inst✝ : NormedSpace 𝕜 G
f : ι → E → G
f' : ι → E → E →L[𝕜] G
s : Set E
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
h's : IsPreconnected s
hf' : UniformCauchySeqOn f' l s
hf : ∀ (n : ι), ∀ y ∈ s, HasFDerivAt (f n) (f' n y) y
x₀ x : E
hx₀ : x₀ ∈ s
hx : x ∈ s
hfg : Cauchy (map (fun n ↦ f n x₀) l)
this : l.NeBot
⊢ Cauchy (map (fun n ↦ f n x) l)

Tactic:
let t := { y | y ∈ s ∧ Cauchy (map (fun n => f n y) l) }

Goal state after:
ι : Type u_1
l : Filter ι
E : Type u_2
inst✝⁵ : NormedAddCommGroup E
𝕜 : Type u_3
inst✝⁴ : NontriviallyNormedField 𝕜
inst✝³ : IsRCLikeNormedField 𝕜
inst✝² : NormedSpace 𝕜 E
G : Type u_4
inst✝¹ : NormedAddCommGroup G
inst✝ : NormedSpace 𝕜 G
f : ι → E → G
f' : ι → E → E →L[𝕜] G
s : Set E
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
h's : IsPreconnected s
hf' : UniformCauchySeqOn f' l s
hf : ∀ (n : ι), ∀ y ∈ s, HasFDerivAt (f n) (f' n y) y
x₀ x : E
hx₀ : x₀ ∈ s
hx : x ∈ s
hfg : Cauchy (map (fun n ↦ f n x₀) l)
this : l.NeBot
t : Set E := {y | y ∈ s ∧ Cauchy (map (fun n ↦ f n y) l)}
⊢ Cauchy (map (fun n ↦ f n x) l)
Module: Mathlib.Analysis.Calculus.ParametricIntegral

Goal state before:
pp: α : Type u_1
inst✝⁶ : MeasurableSpace α
μ : Measure α
𝕜 : Type u_2
inst✝⁵ : RCLike 𝕜
E : Type u_3
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : NormedSpace 𝕜 E
H : Type u_4
inst✝¹ : NormedAddCommGroup H
inst✝ : NormedSpace 𝕜 H
F : H → α → E
x₀ : H
bound : α → ℝ
s : Set H
F' : α → H →L[𝕜] E
hs : s ∈ 𝓝 x₀
hF_meas : ∀ x ∈ s, AEStronglyMeasurable (F x) μ
hF_int : Integrable (F x₀) μ
hF'_meas : AEStronglyMeasurable F' μ
h_lipsch : ∀ᵐ (a : α) ∂μ, ∀ x ∈ s, ‖F x a - F x₀ a‖ ≤ bound a * ‖x - x₀‖
bound_integrable : Integrable bound μ
h_diff : ∀ᵐ (a : α) ∂μ, HasFDerivAt (fun x ↦ F x a) (F' a) x₀
⊢ Integrable F' μ ∧ HasFDerivAt (fun x ↦ ∫ (a : α), F x a ∂μ) (∫ (a : α), F' a ∂μ) x₀

Tactic:
obtain ⟨ε, ε_pos, hε⟩ := Metric.mem_nhds_iff.1 hs

Goal state after:
α : Type u_1
inst✝⁶ : MeasurableSpace α
μ : Measure α
𝕜 : Type u_2
inst✝⁵ : RCLike 𝕜
E : Type u_3
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : NormedSpace 𝕜 E
H : Type u_4
inst✝¹ : NormedAddCommGroup H
inst✝ : NormedSpace 𝕜 H
F : H → α → E
x₀ : H
bound : α → ℝ
s : Set H
F' : α → H →L[𝕜] E
hs : s ∈ 𝓝 x₀
hF_meas : ∀ x ∈ s, AEStronglyMeasurable (F x) μ
hF_int : Integrable (F x₀) μ
hF'_meas : AEStronglyMeasurable F' μ
h_lipsch : ∀ᵐ (a : α) ∂μ, ∀ x ∈ s, ‖F x a - F x₀ a‖ ≤ bound a * ‖x - x₀‖
bound_integrable : Integrable bound μ
h_diff : ∀ᵐ (a : α) ∂μ, HasFDerivAt (fun x ↦ F x a) (F' a) x₀
ε : ℝ
ε_pos : ε > 0
hε : ball x₀ ε ⊆ s
⊢ Integrable F' μ ∧ HasFDerivAt (fun x ↦ ∫ (a : α), F x a ∂μ) (∫ (a : α), F' a ∂μ) x₀
Module: Mathlib.Analysis.InnerProductSpace.EuclideanDist

Goal state before:
pp: E : Type u_1
inst✝⁶ : AddCommGroup E
inst✝⁵ : TopologicalSpace E
inst✝⁴ : IsTopologicalAddGroup E
inst✝³ : T2Space E
inst✝² : Module ℝ E
inst✝¹ : ContinuousSMul ℝ E
inst✝ : FiniteDimensional ℝ E
x : E
⊢ (𝓝 x).HasBasis (fun r ↦ 0 < r) (closedBall x)

Tactic:
by
  rw [toEuclidean.toHomeomorph.nhds_eq_comap x]
  exact Metric.nhds_basis_closedBall.comap _

Goal state after:
Module: Mathlib.Analysis.Calculus.ContDiff.Convolution

Goal state before:
pp: case pos
𝕜 : Type u𝕜
G : Type uG
E : Type uE
E' : Type uE'
F : Type uF
P : Type uP
inst✝¹³ : NormedAddCommGroup E
inst✝¹² : NormedAddCommGroup E'
inst✝¹¹ : NormedAddCommGroup F
f : G → E
inst✝¹⁰ : RCLike 𝕜
inst✝⁹ : NormedSpace 𝕜 E
inst✝⁸ : NormedSpace 𝕜 E'
inst✝⁷ : NormedSpace ℝ F
inst✝⁶ : NormedSpace 𝕜 F
inst✝⁵ : MeasurableSpace G
inst✝⁴ : NormedAddCommGroup G
inst✝³ : BorelSpace G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup P
inst✝ : NormedSpace 𝕜 P
μ : Measure G
L : E →L[𝕜] E' →L[𝕜] F
g : P → G → E'
s : Set P
k : Set G
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
hk : IsCompact k
hgs : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g p x = 0
hf : LocallyIntegrable f μ
hg : ContDiffOn 𝕜 1 (↿g) (s ×ˢ univ)
q₀ : P × G
hq₀ : q₀.1 ∈ s
g' : P × G → P × G →L[𝕜] E' := fderiv 𝕜 ↿g
A✝ :
  ∀ p ∈ s,
    Continuous[PseudoMetricSpace.toUniformSpace.toTopologicalSpace, PseudoMetricSpace.toUniformSpace.toTopologicalSpace]
      (g p)
A' : ∀ (q : P × G), q.1 ∈ s → s ×ˢ univ ∈ 𝓝 q
g'_zero : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g' (p, x) = 0
A : IsCompact ({q₀.1} ×ˢ k)
t : Set (P × G)
kt : {q₀.1} ×ˢ k ⊆ t
t_open : IsOpen[instTopologicalSpaceProd] t
ht : Bornology.IsBounded (g' '' t)
ε : ℝ
εpos : 0 < ε
hε : thickening ε ({q₀.1} ×ˢ k) ⊆ t
h'ε : ball q₀.1 ε ⊆ s
C : ℝ
Cpos : 0 < C
hC : g' '' t ⊆ closedBall 0 C
p : P
x : G
hp : ‖p - q₀.1‖ < ε
hps : p ∈ s
hx : x ∈ k
H : (p, x) ∈ t
this : g' (p, x) ∈ closedBall 0 C
⊢ ‖g' (p, x)‖ ≤ C

Tactic:
rwa [mem_closedBall_zero_iff] at this

Goal state after:
Module: Mathlib.Analysis.Calculus.ContDiff.Convolution

Goal state before:
pp: 𝕜 : Type u𝕜
G : Type uG
E : Type uE
E' : Type uE'
F : Type uF
P : Type uP
inst✝¹³ : NormedAddCommGroup E
inst✝¹² : NormedAddCommGroup E'
inst✝¹¹ : NormedAddCommGroup F
f : G → E
inst✝¹⁰ : RCLike 𝕜
inst✝⁹ : NormedSpace 𝕜 E
inst✝⁸ : NormedSpace 𝕜 E'
inst✝⁷ : NormedSpace ℝ F
inst✝⁶ : NormedSpace 𝕜 F
inst✝⁵ : MeasurableSpace G
inst✝⁴ : NormedAddCommGroup G
inst✝³ : BorelSpace G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup P
inst✝ : NormedSpace 𝕜 P
μ : Measure G
L : E →L[𝕜] E' →L[𝕜] F
g : P → G → E'
s : Set P
k : Set G
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
hk : IsCompact k
hgs : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g p x = 0
hf : LocallyIntegrable f μ
hg : ContDiffOn 𝕜 1 (↿g) (s ×ˢ univ)
q₀ : P × G
hq₀ : q₀.1 ∈ s
g' : P × G → P × G →L[𝕜] E' := fderiv 𝕜 ↿g
A :
  ∀ p ∈ s,
    Continuous[PseudoMetricSpace.toUniformSpace.toTopologicalSpace, PseudoMetricSpace.toUniformSpace.toTopologicalSpace]
      (g p)
A' : ∀ (q : P × G), q.1 ∈ s → s ×ˢ univ ∈ 𝓝 q
g'_zero : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g' (p, x) = 0
⊢ ∃ ε C, 0 < ε ∧ ball q₀.1 ε ⊆ s ∧ ∀ (p : P) (x : G), ‖p - q₀.1‖ < ε → ‖g' (p, x)‖ ≤ C

Tactic:
by
    have A : IsCompact ({q₀.1} ×ˢ k) := isCompact_singleton.prod hk
    obtain ⟨t, kt, t_open, ht⟩ : ∃ t, {q₀.1} ×ˢ k ⊆ t ∧ IsOpen t ∧ IsBounded (g' '' t) := by
      have B : ContinuousOn g' (s ×ˢ univ) :=
        hg.continuousOn_fderiv_of_isOpen (hs.prod isOpen_univ) le_rfl
      apply exists_isOpen_isBounded_image_of_isCompact_of_continuousOn A (hs.prod isOpen_univ) _ B
      simp only [prod_subset_prod_iff, hq₀, singleton_subset_iff, subset_univ, and_self_iff,
        true_or]
    obtain ⟨ε, εpos, hε, h'ε⟩ :
      ∃ ε : ℝ, 0 < ε ∧ thickening ε ({q₀.fst} ×ˢ k) ⊆ t ∧ ball q₀.1 ε ⊆ s := by
      obtain ⟨ε, εpos, hε⟩ : ∃ ε : ℝ, 0 < ε ∧ thickening ε (({q₀.fst} : Set P) ×ˢ k) ⊆ t :=
        A.exists_thickening_subset_open t_open kt
      obtain ⟨δ, δpos, hδ⟩ : ∃ δ : ℝ, 0 < δ ∧ ball q₀.1 δ ⊆ s := Metric.isOpen_iff.1 hs _ hq₀
      refine ⟨min ε δ, lt_min εpos δpos, ?_, ?_⟩
      · exact Subset.trans (thickening_mono (min_le_left _ _) _) hε
      · exact Subset.trans (ball_subset_ball (min_le_right _ _)) hδ
    obtain ⟨C, Cpos, hC⟩ : ∃ C, 0 < C ∧ g' '' t ⊆ closedBall 0 C := ht.subset_closedBall_lt 0 0
    refine ⟨ε, C, εpos, h'ε, fun p x hp => ?_⟩
    have hps : p ∈ s := h'ε (mem_ball_iff_norm.2 hp)
    by_cases hx : x ∈ k
    · have H : (p, x) ∈ t := by
        apply hε
        refine mem_thickening_iff.2 ⟨(q₀.1, x), ?_, ?_⟩
        · simp only [hx, singleton_prod, mem_image, Prod.mk_inj, true_and, exists_eq_right]
        · rw [← dist_eq_norm] at hp
          simpa only [Prod.dist_eq, εpos, dist_self, max_lt_iff, and_true] using hp
      have : g' (p, x) ∈ closedBall (0 : P × G →L[𝕜] E') C := hC (mem_image_of_mem _ H)
      rwa [mem_closedBall_zero_iff] at this
    · have : g' (p, x) = 0 := g'_zero _ _ hps hx
      rw [this]
      simpa only [norm_zero] using Cpos.le

Goal state after:
Module: Mathlib.Analysis.Calculus.ContDiff.Convolution

Goal state before:
pp: 𝕜 : Type u𝕜
G : Type uG
E : Type uE
E' : Type uE'
F : Type uF
P : Type uP
inst✝¹³ : NormedAddCommGroup E
inst✝¹² : NormedAddCommGroup E'
inst✝¹¹ : NormedAddCommGroup F
f : G → E
inst✝¹⁰ : RCLike 𝕜
inst✝⁹ : NormedSpace 𝕜 E
inst✝⁸ : NormedSpace 𝕜 E'
inst✝⁷ : NormedSpace ℝ F
inst✝⁶ : NormedSpace 𝕜 F
inst✝⁵ : MeasurableSpace G
inst✝⁴ : NormedAddCommGroup G
inst✝³ : BorelSpace G
inst✝² : NormedSpace 𝕜 G
inst✝¹ : NormedAddCommGroup P
inst✝ : NormedSpace 𝕜 P
μ : Measure G
L : E →L[𝕜] E' →L[𝕜] F
g : P → G → E'
s : Set P
k : Set G
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
hk : IsCompact k
hgs : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g p x = 0
hf : LocallyIntegrable f μ
hg : ContDiffOn 𝕜 1 (↿g) (s ×ˢ univ)
q₀ : P × G
hq₀ : q₀.1 ∈ s
g' : P × G → P × G →L[𝕜] E' := fderiv 𝕜 ↿g
A :
  ∀ p ∈ s,
    Continuous[PseudoMetricSpace.toUniformSpace.toTopologicalSpace, PseudoMetricSpace.toUniformSpace.toTopologicalSpace]
      (g p)
A' : ∀ (q : P × G), q.1 ∈ s → s ×ˢ univ ∈ 𝓝 q
g'_zero : ∀ (p : P) (x : G), p ∈ s → x ∉ k → g' (p, x) = 0
ε C : ℝ
εpos : 0 < ε
h₀ε : ball q₀.1 ε ⊆ s
hε : ∀ (p : P) (x : G), ‖p - q₀.1‖ < ε → ‖g' (p, x)‖ ≤ C
I1 : ∀ᶠ (x : P × G) in 𝓝 q₀, AEStronglyMeasurable (fun a ↦ (L (f a)) (g x.1 (x.2 - a))) μ
I2 : Integrable (fun a ↦ (L (f a)) (g q₀.1 (q₀.2 - a))) μ
I3 : AEStronglyMeasurable (fun a ↦ L (f a) ∘SL g' (q₀.1, q₀.2 - a)) μ
K' : Set G := -k + {q₀.2}
K'_def : K' = -k + {q₀.2}
hK' : IsCompact K'
U : Set G
U_open : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] U
K'U : K' ⊆ U
hU : IntegrableOn f U μ
⊢ ∃ δ, 0 < δ ∧ δ ≤ ε ∧ K' + ball 0 δ ⊆ U

Tactic:
by
    obtain ⟨V, V_mem, hV⟩ : ∃ V ∈ 𝓝 (0 : G), K' + V ⊆ U :=
      compact_open_separated_add_right hK' U_open K'U
    rcases Metric.mem_nhds_iff.1 V_mem with ⟨δ, δpos, hδ⟩
    refine ⟨min δ ε, lt_min δpos εpos, min_le_right δ ε, ?_⟩
    exact (add_subset_add_left ((ball_subset_ball (min_le_left _ _)).trans hδ)).trans hV

Goal state after:
Module: Mathlib.Analysis.Calculus.BumpFunction.FiniteDimension

Goal state before:
pp: case inr
E : Type u_1
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
inst✝ : FiniteDimensional ℝ E
n : ℕ∞
s : Set E
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
h's : s.Nonempty
⊢ ∃ f, support f = s ∧ ContDiff ℝ (↑n) f ∧ range f ⊆ Icc 0 1

Tactic:
let ι := { f : E → ℝ // f.support ⊆ s ∧ HasCompactSupport f ∧ ContDiff ℝ ∞ f ∧ range f ⊆ Icc 0 1 }

Goal state after:
case inr
E : Type u_1
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
inst✝ : FiniteDimensional ℝ E
n : ℕ∞
s : Set E
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
h's : s.Nonempty
ι : Type (max 0 u_1) := { f // support f ⊆ s ∧ HasCompactSupport f ∧ ContDiff ℝ ∞ f ∧ range f ⊆ Icc 0 1 }
⊢ ∃ f, support f = s ∧ ContDiff ℝ (↑n) f ∧ range f ⊆ Icc 0 1
Module: Mathlib.Analysis.Calculus.BumpFunction.FiniteDimension

Goal state before:
pp: case inr.refine_1.h₂
E : Type u_1
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
inst✝ : FiniteDimensional ℝ E
n✝ : ℕ∞
s : Set E
hs : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] s
h's : s.Nonempty
ι : Type (max 0 u_1) := { f // support f ⊆ s ∧ HasCompactSupport f ∧ ContDiff ℝ ∞ f ∧ range f ⊆ Icc 0 1 }
T : Set ι
T_count : T.Countable
hT : ⋃ f ∈ T, support ↑f = s
g0 : ℕ → ι
hg : T = range g0
g : ℕ → E → ℝ := fun n ↦ ↑(g0 n)
g_s : ∀ (n : ℕ), support (g n) ⊆ s
s_g : ∀ x ∈ s, ∃ n, x ∈ support (g n)
g_smooth : ∀ (n : ℕ), ContDiff ℝ ∞ (g n)
g_comp_supp : ∀ (n : ℕ), HasCompactSupport (g n)
g_nonneg : ∀ (n : ℕ) (x : E), 0 ≤ g n x
δ : ℕ → ℝ≥0
δpos : ∀ (i : ℕ), 0 < δ i
c : ℝ≥0
δc : HasSum δ c
c_lt : c < 1
r : ℕ → ℝ
rpos : ∀ (n : ℕ), 0 < r n
hr : ∀ (n i : ℕ), i ≤ n → ∀ (x : E), ‖iteratedFDeriv ℝ i (r n • g n) x‖ ≤ ↑(δ n)
S : ∀ (x : E), Summable fun n ↦ (r n • g n) x
x : E
hx : x ∈ s
n : ℕ
hn : x ∈ support (g n)
I : 0 < r n * g n x
⊢ x ∈ support fun x ↦ ∑' (n : ℕ), (r n • g n) x

Tactic:
exact ne_of_gt ((S x).tsum_pos (fun i => mul_nonneg (rpos i).le (g_nonneg i x)) n I)

Goal state after:
Module: Mathlib.MeasureTheory.Measure.Haar.Unique

Goal state before:
pp: case pos
G : Type u_1
inst✝⁶ : TopologicalSpace G
inst✝⁵ : Group G
inst✝⁴ : IsTopologicalGroup G
inst✝³ : MeasurableSpace G
inst✝² : BorelSpace G
μ' μ : Measure G
inst✝¹ : μ.IsHaarMeasure
inst✝ : μ'.IsHaarMeasure
φ : G ≃ₜ* G
hG : LocallyCompactSpace G
f : G → ℝ
f_cont : Continuous[inst✝⁶, _] f
hf :
  HasCompactSupport ⇑{ toFun := f, continuous_toFun := f_cont } ∧
    0 ≤ ⇑{ toFun := f, continuous_toFun := f_cont } ∧ { toFun := f, continuous_toFun := f_cont } 1 ≠ 0
int_f_ne_zero : ∫ (x : G), f x ∂map (⇑φ) μ ≠ 0
⊢ ↑((map (⇑φ) μ').haarScalarFactor (map (⇑φ) μ)) = ↑(μ'.haarScalarFactor μ)

Tactic:
haarScalarFactor_eq_integral_div_of_continuous_nonneg_pos _ _ hf,

Goal state after:
case pos
G : Type u_1
inst✝⁶ : TopologicalSpace G
inst✝⁵ : Group G
inst✝⁴ : IsTopologicalGroup G
inst✝³ : MeasurableSpace G
inst✝² : BorelSpace G
μ' μ : Measure G
inst✝¹ : μ.IsHaarMeasure
inst✝ : μ'.IsHaarMeasure
φ : G ≃ₜ* G
hG : LocallyCompactSpace G
f : G → ℝ
f_cont : Continuous[inst✝⁶, _] f
hf :
  HasCompactSupport ⇑{ toFun := f, continuous_toFun := f_cont } ∧
    0 ≤ ⇑{ toFun := f, continuous_toFun := f_cont } ∧ { toFun := f, continuous_toFun := f_cont } 1 ≠ 0
int_f_ne_zero : ∫ (x : G), f x ∂map (⇑φ) μ ≠ 0
⊢ (∫ (x : G), { toFun := f, continuous_toFun := f_cont } x ∂map (⇑φ) μ') /
      ∫ (x : G), { toFun := f, continuous_toFun := f_cont } x ∂map (⇑φ) μ =
    ↑(μ'.haarScalarFactor μ)
Module: Mathlib.Analysis.Calculus.BumpFunction.FiniteDimension

Goal state before:
pp: case refine_1
E : Type u_1
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : FiniteDimensional ℝ E
inst✝¹ : MeasurableSpace E
inst✝ : BorelSpace E
D : ℝ
x : E
Dpos : 0 < D
D_lt_one : D < 1
hx : ‖x‖ < 1 + D
⊢ Integrable (fun i ↦ w D i * φ (x - i)) μ

pp: case refine_2
E : Type u_1
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : FiniteDimensional ℝ E
inst✝¹ : MeasurableSpace E
inst✝ : BorelSpace E
D : ℝ
x : E
Dpos : 0 < D
D_lt_one : D < 1
hx : ‖x‖ < 1 + D
⊢ 0 < μ (support fun i ↦ w D i * φ (x - i))

Tactic:
· have F_comp : HasCompactSupport (w D) := w_compact_support E Dpos
    have B : LocallyIntegrable (φ : E → ℝ) μ :=
      (locallyIntegrable_const _).indicator measurableSet_closedBall
    have C : Continuous (w D : E → ℝ) :=
      continuous_const.mul ((u_continuous E).comp (by fun_prop))
    exact (F_comp.convolutionExists_left (lsmul ℝ ℝ : ℝ →L[ℝ] ℝ →L[ℝ] ℝ) C B x).integrable

Goal state after:
case refine_2
E : Type u_1
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedSpace ℝ E
inst✝² : FiniteDimensional ℝ E
inst✝¹ : MeasurableSpace E
inst✝ : BorelSpace E
D : ℝ
x : E
Dpos : 0 < D
D_lt_one : D < 1
hx : ‖x‖ < 1 + D
⊢ 0 < μ (support fun i ↦ w D i * φ (x - i))
Module: Mathlib.Analysis.InnerProductSpace.ConformalLinearMap

Goal state before:
pp: case mpr.refine_2
E : Type u_1
F : Type u_2
inst✝³ : NormedAddCommGroup E
inst✝² : NormedAddCommGroup F
inst✝¹ : InnerProductSpace ℝ E
inst✝ : InnerProductSpace ℝ F
f : E →L[ℝ] F
c : ℝ
hc : 0 < c
hc₁ : 0 < c * c
huv : ∀ (u v : E), ⟪f u, f v⟫ = c * c * ⟪u, v⟫
x : E
⊢ f x = (c • ((c⁻¹ • ↑f).isometryOfInner ⋯).toContinuousLinearMap) x

Tactic:
exact (smul_inv_smul₀ hc.ne' (f x)).symm

Goal state after:
Module: Mathlib.MeasureTheory.Measure.Haar.Unique

Goal state before:
pp: G : Type u_1
inst✝⁷ : TopologicalSpace G
inst✝⁶ : Group G
inst✝⁵ : IsTopologicalGroup G
inst✝⁴ : MeasurableSpace G
inst✝³ : BorelSpace G
inst✝² : LocallyCompactSpace G
μ' μ : Measure G
inst✝¹ : μ.IsHaarMeasure
inst✝ : μ'.IsHaarMeasure
s : Set G
hs : MeasurableSet s
h's : μ.IsEverywherePos s
ν : Measure G := μ'.haarScalarFactor μ • μ
k : Set G
k_comp : IsCompact k
k_closed : IsClosed[inst✝⁷] k
k_mem : k ∈ 𝓝 1
one_k : 1 ∈ k
A : Set (Set G) := {t | t ⊆ s ∧ t.PairwiseDisjoint fun x ↦ x • k}
m : Set G
m_max : Maximal (fun x ↦ x ∈ A) m
hms : m ⊆ s
hdj : m.PairwiseDisjoint fun x ↦ x • k
y : G
hy : y ∈ s
h'y : m ∪ {y} ∉ A
⊢ ∃ x ∈ m, y ≠ x ∧ ∃ z ∈ y • k, z ∈ x • k

Tactic:
by
        simpa [A, hms, hy, insert_subset_iff, pairwiseDisjoint_insert, hdj, not_disjoint_iff]
          using h'y

Goal state after: