mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Analysis.InnerProductSpace.Orthonormal

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝⁴ : RCLike 𝕜
inst✝³ : SeminormedAddCommGroup E
inst✝² : InnerProductSpace 𝕜 E
ι : Type u_4
E' : Type u_7
inst✝¹ : SeminormedAddCommGroup E'
inst✝ : InnerProductSpace 𝕜 E'
v : ι → E
hv : Orthonormal 𝕜 v
f : E →ₗᵢ[𝕜] E'
⊢ Orthonormal 𝕜 (⇑f ∘ v)

Tactic:
f.orthonormal_comp_iff

Goal state after:
𝕜 : Type u_1
E : Type u_2
inst✝⁴ : RCLike 𝕜
inst✝³ : SeminormedAddCommGroup E
inst✝² : InnerProductSpace 𝕜 E
ι : Type u_4
E' : Type u_7
inst✝¹ : SeminormedAddCommGroup E'
inst✝ : InnerProductSpace 𝕜 E'
v : ι → E
hv : Orthonormal 𝕜 v
f : E →ₗᵢ[𝕜] E'
⊢ Orthonormal 𝕜 v
Module: Mathlib.Analysis.InnerProductSpace.Subspace

Goal state before:
pp: case mpr
𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : SeminormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_4
G : ι → Type u_5
inst✝² : (i : ι) → NormedAddCommGroup (G i)
inst✝¹ : (i : ι) → InnerProductSpace 𝕜 (G i)
V : (i : ι) → G i →ₗᵢ[𝕜] E
hV : OrthogonalFamily 𝕜 G V
inst✝ : CompleteSpace E
f : (i : ι) → G i
⊢ (∀ ε > 0, ∃ N, ∀ (m : Finset ι), N ⊆ m → ∀ (n : Finset ι), N ⊆ n → |∑ i ∈ m, ‖f i‖ ^ 2 - ∑ i ∈ n, ‖f i‖ ^ 2| < ε) →
    ∀ ε > 0, ∃ N, ∀ (m : Finset ι), N ⊆ m → ∀ (n : Finset ι), N ⊆ n → ‖∑ i ∈ m, (V i) (f i) - ∑ i ∈ n, (V i) (f i)‖ < ε

Tactic:
· intro hf ε hε
      have hε' : 0 < ε ^ 2 / 2 := half_pos (sq_pos_of_pos hε)
      obtain ⟨a, H⟩ := hf _ hε'
      use a
      intro s₁ hs₁ s₂ hs₂
      refine (abs_lt_of_sq_lt_sq' ?_ (le_of_lt hε)).2
      have has : a ≤ s₁ ⊓ s₂ := le_inf hs₁ hs₂
      rw [hV.norm_sq_sdiff_sum]
      have Hs₁ : ∑ x ∈ s₁ \ s₂, ‖f x‖ ^ 2 < ε ^ 2 / 2 := by
        convert! H _ hs₁ _ has
        have : s₁ ⊓ s₂ ⊆ s₁ := Finset.inter_subset_left
        rw [← Finset.sum_sdiff this, add_tsub_cancel_right, Finset.abs_sum_of_nonneg']
        · simp
        · exact fun i => sq_nonneg _
      have Hs₂ : ∑ x ∈ s₂ \ s₁, ‖f x‖ ^ 2 < ε ^ 2 / 2 := by
        convert! H _ hs₂ _ has
        have : s₁ ⊓ s₂ ⊆ s₂ := Finset.inter_subset_right
        rw [← Finset.sum_sdiff this, add_tsub_cancel_right, Finset.abs_sum_of_nonneg']
        · simp
        · exact fun i => sq_nonneg _
      linarith

Goal state after:
Module: Mathlib.Analysis.InnerProductSpace.Orthogonal

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
F : Type u_3
inst✝⁴ : RCLike 𝕜
inst✝³ : NormedAddCommGroup E
inst✝² : InnerProductSpace 𝕜 E
inst✝¹ : NormedAddCommGroup F
inst✝ : InnerProductSpace 𝕜 F
f : E ≃ₗᵢ[𝕜] F
U V : Submodule 𝕜 E
h : Submodule.map (↑↑↑f) U ⟂ Submodule.map (↑↑↑f) V
⊢ U ⟂ V

Tactic:
have hf : ∀ p : Submodule 𝕜 E,
      (p.map (f : E →ₗ[𝕜] F)).comap (f.toLinearIsometry : E →ₗ[𝕜] F) = p :=
    comap_map_eq_of_injective f.injective

Goal state after:
𝕜 : Type u_1
E : Type u_2
F : Type u_3
inst✝⁴ : RCLike 𝕜
inst✝³ : NormedAddCommGroup E
inst✝² : InnerProductSpace 𝕜 E
inst✝¹ : NormedAddCommGroup F
inst✝ : InnerProductSpace 𝕜 F
f : E ≃ₗᵢ[𝕜] F
U V : Submodule 𝕜 E
h : Submodule.map (↑↑↑f) U ⟂ Submodule.map (↑↑↑f) V
hf : ∀ (p : Submodule 𝕜 E), Submodule.comap (↑f.toLinearIsometry) (Submodule.map (↑↑↑f) p) = p
⊢ U ⟂ V
Module: Mathlib.Analysis.InnerProductSpace.Symmetric

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝³ : RCLike 𝕜
inst✝² : NormedAddCommGroup E
inst✝¹ : InnerProductSpace 𝕜 E
inst✝ : CompleteSpace E
T : E →ₗ[𝕜] E
hT : T.IsSymmetric
u : ℕ → E
x y : E
hu : Filter.Tendsto u Filter.atTop (nhds x)
hTu : Filter.Tendsto (⇑T ∘ u) Filter.atTop (nhds y)
k : ℕ
⊢ ⟪T (u k) - T x, y - T x⟫ = ⟪u k - x, T (y - T x)⟫

Tactic:
rw [← T.map_sub, hT]

Goal state after:
Module: Mathlib.Analysis.InnerProductSpace.Symmetric

Goal state before:
pp: case refine_1
𝕜 : Type u_1
E : Type u_2
inst✝² : RCLike 𝕜
inst✝¹ : NormedAddCommGroup E
inst✝ : InnerProductSpace 𝕜 E
U V : Submodule 𝕜 E
hUV : IsCompl U V
h : (U.subtype ∘ₗ U.projectionOnto V hUV).IsSymmetric
u : E
hu : u ∈ U
v : E
hv : v ∈ V
⊢ ⟪v, u⟫ = 0

Tactic:
← Subtype.coe_mk u hu,

Goal state after:
case refine_1
𝕜 : Type u_1
E : Type u_2
inst✝² : RCLike 𝕜
inst✝¹ : NormedAddCommGroup E
inst✝ : InnerProductSpace 𝕜 E
U V : Submodule 𝕜 E
hUV : IsCompl U V
h : (U.subtype ∘ₗ U.projectionOnto V hUV).IsSymmetric
u : E
hu : u ∈ U
v : E
hv : v ∈ V
⊢ ⟪v, ↑⟨u, hu⟩⟫ = 0
Module: Mathlib.Analysis.InnerProductSpace.Symmetric

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝² : RCLike 𝕜
inst✝¹ : NormedAddCommGroup E
inst✝ : InnerProductSpace 𝕜 E
U V : Submodule 𝕜 E
hUV : IsCompl U V
⊢ (U.projection V hUV).IsSymmetric ↔ U ⟂ V

Tactic:
by
  rw [projection]
  refine ⟨fun h u hu v hv => ?_, fun h x y => ?_⟩
  · rw [← Subtype.coe_mk u hu, ← Subtype.coe_mk v hv,
      ← Submodule.projectionOnto_apply_left hUV ⟨u, hu⟩, ← U.subtype_apply, ← comp_apply,
      ← h, comp_apply, Submodule.projectionOnto_apply_right hUV ⟨v, hv⟩,
      map_zero, inner_zero_left]
  · nth_rw 2 [← projection_add_projection_eq_self hUV x]
    nth_rw 1 [← projection_add_projection_eq_self hUV y]
    rw [isOrtho_iff_inner_eq] at h
    simp [inner_add_right, inner_add_left, h, inner_eq_zero_symm]

Goal state after:
Module: Mathlib.Analysis.InnerProductSpace.Projection.Basic

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
F : Type u_3
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedAddCommGroup F
inst✝² : InnerProductSpace 𝕜 E
inst✝¹ : InnerProductSpace ℝ F
K : Submodule 𝕜 E
inst✝ : K.HasOrthogonalProjection
v : E
⊢ ∃ w ∈ Kᗮ, v - w ∈ Kᗮᗮ

Tactic:
rcases HasOrthogonalProjection.exists_orthogonal (K := K) v with ⟨w, hwK, hw⟩

Goal state after:
𝕜 : Type u_1
E : Type u_2
F : Type u_3
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : NormedAddCommGroup F
inst✝² : InnerProductSpace 𝕜 E
inst✝¹ : InnerProductSpace ℝ F
K : Submodule 𝕜 E
inst✝ : K.HasOrthogonalProjection
v w : E
hwK : w ∈ K
hw : v - w ∈ Kᗮ
⊢ ∃ w ∈ Kᗮ, v - w ∈ Kᗮᗮ
Module: Mathlib.Analysis.InnerProductSpace.Projection.FiniteDimensional

Goal state before:
pp: case mp
𝕜 : Type u_1
E : Type u_2
inst✝² : RCLike 𝕜
inst✝¹ : NormedAddCommGroup E
inst✝ : InnerProductSpace 𝕜 E
v : Set E
hv : Orthonormal 𝕜 Subtype.val
⊢ (∃ x ∈ (span 𝕜 v)ᗮ, x ≠ 0) → ∃ u ⊇ v, Orthonormal 𝕜 Subtype.val ∧ u ≠ v

Tactic:
rintro ⟨x, hx', hx⟩

Goal state after:
case mp
𝕜 : Type u_1
E : Type u_2
inst✝² : RCLike 𝕜
inst✝¹ : NormedAddCommGroup E
inst✝ : InnerProductSpace 𝕜 E
v : Set E
hv : Orthonormal 𝕜 Subtype.val
x : E
hx' : x ∈ (span 𝕜 v)ᗮ
hx : x ≠ 0
⊢ ∃ u ⊇ v, Orthonormal 𝕜 Subtype.val ∧ u ≠ v
Module: Mathlib.LinearAlgebra.UnitaryGroup

Goal state before:
pp: n : Type u
inst✝³ : DecidableEq n
inst✝² : Fintype n
α : Type v
inst✝¹ : CommRing α
inst✝ : StarRing α
A : Matrix n n α
⊢ A ∈ unitaryGroup n α ↔ star A * A = 1

Tactic:
refine ⟨And.left, fun hA => ⟨hA, ?_⟩⟩

Goal state after:
n : Type u
inst✝³ : DecidableEq n
inst✝² : Fintype n
α : Type v
inst✝¹ : CommRing α
inst✝ : StarRing α
A : Matrix n n α
hA : star A * A = 1
⊢ A * star A = 1
Module: Mathlib.LinearAlgebra.UnitaryGroup

Goal state before:
pp: case left
n : Type u
inst✝⁵ : DecidableEq n
inst✝⁴ : Fintype n
R : Type u_1
m : Type u_2
inst✝³ : Semiring R
inst✝² : StarRing R
inst✝¹ : Fintype m
inst✝ : DecidableEq m
U₁ : Matrix n n R
U₂ : Matrix m m R
hU₁ : U₁ ∈ unitary (Matrix n n R)
hU₂ : U₂ ∈ unitary (Matrix m m R)
i✝ j✝ : n × m
⊢ ∑ x ∈ Finset.univ ×ˢ Finset.univ, star U₂ i✝.2 x.2 * (star U₁ i✝.1 x.1 * U₁ x.1 j✝.1) * U₂ x.2 j✝.2 = 1 i✝ j✝

Tactic:
Finset.sum_product

Goal state after:
case left
n : Type u
inst✝⁵ : DecidableEq n
inst✝⁴ : Fintype n
R : Type u_1
m : Type u_2
inst✝³ : Semiring R
inst✝² : StarRing R
inst✝¹ : Fintype m
inst✝ : DecidableEq m
U₁ : Matrix n n R
U₂ : Matrix m m R
hU₁ : U₁ ∈ unitary (Matrix n n R)
hU₂ : U₂ ∈ unitary (Matrix m m R)
i✝ j✝ : n × m
⊢ ∑ x, ∑ x_1, star U₂ i✝.2 x_1 * (star U₁ i✝.1 x * U₁ x j✝.1) * U₂ x_1 j✝.2 = 1 i✝ j✝
Module: Mathlib.Analysis.Normed.Lp.PiLp

Goal state before:
pp: p✝ : ℝ≥0∞
𝕜 : Type u_1
ι✝ : Type u_2
α✝ : ι✝ → Type u_3
β : ι✝ → Type u_4
hp : Fact (1 ≤ p✝)
inst✝¹⁰ : Fintype ι✝
inst✝⁹ : Semiring 𝕜
inst✝⁸ : (i : ι✝) → SeminormedAddCommGroup (α✝ i)
inst✝⁷ : (i : ι✝) → SeminormedAddCommGroup (β i)
inst✝⁶ : (i : ι✝) → Module 𝕜 (α✝ i)
inst✝⁵ : (i : ι✝) → Module 𝕜 (β i)
c : 𝕜
ι : Type u_5
κ : ι → Type u_6
p : ℝ≥0∞
inst✝⁴ : Fact (1 ≤ p)
inst✝³ : Fintype ι
inst✝² : (i : ι) → Fintype (κ i)
α : (i : ι) → κ i → Type u_7
inst✝¹ : (i : ι) → (k : κ i) → SeminormedAddCommGroup (α i k)
inst✝ : (i : ι) → (k : κ i) → Module 𝕜 (α i k)
x : (i : Sigma κ) → (fun i ↦ α i.fst i.snd) i
⊢ ↑‖((WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd) ≪≫ₗ LinearEquiv.piCurry 𝕜 α ≪≫ₗ
              LinearEquiv.piCongrRight fun x ↦ (WithLp.linearEquiv p 𝕜 ((j : κ x) → α x j)).symm) ≪≫ₗ
            (WithLp.linearEquiv p 𝕜 ((i : ι) → WithLp p ((j : κ i) → α i j))).symm)
          ((WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd)).symm x)‖₊ =
    ↑‖(WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd)).symm x‖₊

Tactic:
NNReal.coe_inj,

Goal state after:
p✝ : ℝ≥0∞
𝕜 : Type u_1
ι✝ : Type u_2
α✝ : ι✝ → Type u_3
β : ι✝ → Type u_4
hp : Fact (1 ≤ p✝)
inst✝¹⁰ : Fintype ι✝
inst✝⁹ : Semiring 𝕜
inst✝⁸ : (i : ι✝) → SeminormedAddCommGroup (α✝ i)
inst✝⁷ : (i : ι✝) → SeminormedAddCommGroup (β i)
inst✝⁶ : (i : ι✝) → Module 𝕜 (α✝ i)
inst✝⁵ : (i : ι✝) → Module 𝕜 (β i)
c : 𝕜
ι : Type u_5
κ : ι → Type u_6
p : ℝ≥0∞
inst✝⁴ : Fact (1 ≤ p)
inst✝³ : Fintype ι
inst✝² : (i : ι) → Fintype (κ i)
α : (i : ι) → κ i → Type u_7
inst✝¹ : (i : ι) → (k : κ i) → SeminormedAddCommGroup (α i k)
inst✝ : (i : ι) → (k : κ i) → Module 𝕜 (α i k)
x : (i : Sigma κ) → (fun i ↦ α i.fst i.snd) i
⊢ ‖((WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd) ≪≫ₗ LinearEquiv.piCurry 𝕜 α ≪≫ₗ
            LinearEquiv.piCongrRight fun x ↦ (WithLp.linearEquiv p 𝕜 ((j : κ x) → α x j)).symm) ≪≫ₗ
          (WithLp.linearEquiv p 𝕜 ((i : ι) → WithLp p ((j : κ i) → α i j))).symm)
        ((WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd)).symm x)‖₊ =
    ‖(WithLp.linearEquiv p 𝕜 ((i : Sigma κ) → α i.fst i.snd)).symm x‖₊
Module: Mathlib.MeasureTheory.Measure.Haar.OfBasis

Goal state before:
pp: case mpr.refine_1.inr
ι : Type u_1
inst✝¹ : Fintype ι
inst✝ : DecidableEq ι
a x : ι → ℝ
i : ι
h : min 0 (a i) ≤ x i ∧ x i ≤ max 0 (a i)
hai : 0 ≤ a i
⊢ 0 ≤ (fun i ↦ x i / a i) i ∧ (fun i ↦ x i / a i) i ≤ 1

Tactic:
rw [sup_eq_right.mpr hai, inf_eq_left.mpr hai] at h
        exact ⟨div_nonneg h.1 hai, div_le_one_of_le₀ h.2 hai⟩

Goal state after:
Module: Mathlib.MeasureTheory.Measure.Lebesgue.Basic

Goal state before:
pp: ι : Type u_1
inst✝ : Fintype ι
f : (ι → ℝ) →ₗ[ℝ] ι → ℝ
hf : LinearMap.det f ≠ 0
M : Matrix ι ι ℝ := LinearMap.toMatrix' f
A : LinearMap.det f = M.det
⊢ Measure.map (⇑f) volume = ofReal |(LinearMap.det f)⁻¹| • volume

Tactic:
have B : f = toLin' M := by simp only [M, toLin'_toMatrix']

Goal state after:
ι : Type u_1
inst✝ : Fintype ι
f : (ι → ℝ) →ₗ[ℝ] ι → ℝ
hf : LinearMap.det f ≠ 0
M : Matrix ι ι ℝ := LinearMap.toMatrix' f
A : LinearMap.det f = M.det
B : f = toLin' M
⊢ Measure.map (⇑f) volume = ofReal |(LinearMap.det f)⁻¹| • volume
Module: Mathlib.MeasureTheory.Measure.Lebesgue.EqHaar

Goal state before:
pp: E : Type u_1
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
inst✝³ : MeasurableSpace E
inst✝² : BorelSpace E
inst✝¹ : FiniteDimensional ℝ E
μ : Measure E
inst✝ : μ.IsAddHaarMeasure
s : Set E
u : ℕ → E
hu : Bornology.IsBounded (range u)
hs : Pairwise (Disjoint on fun n ↦ {u n} + s)
h's : MeasurableSet s
H : ∀ (R : ℝ), μ (s ∩ closedBall 0 R) = 0
⊢ μ s ≤ ∑' (n : ℕ), μ (s ∩ closedBall 0 ↑n)

Tactic:
conv_lhs => rw [← iUnion_inter_closedBall_nat s 0]
        exact measure_iUnion_le _

Goal state after:
Module: Mathlib.Algebra.Module.ZLattice.Basic

Goal state before:
pp: E : Type u_1
ι : Type u_2
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
b : Basis ι ℝ E
inst✝³ : Fintype ι
inst✝² : MeasurableSpace E
μ : Measure E
inst✝¹ : BorelSpace E
inst✝ : μ.IsAddHaarMeasure
this✝ : FiniteDimensional ℝ E
x : E
hx : (∀ (i : ι), 0 ≤ (b.repr x) i ∧ (b.repr x) i ≤ 1) ∧ ∃ x_1, 0 ≤ (b.repr x) x_1 → 1 ≤ (b.repr x) x_1
i : ι
hi : 0 ≤ (b.repr x) i → 1 ≤ (b.repr x) i
this : (b.repr x) i = 1
⊢ ∑ i, (b.repr x) i • b i ∈ ⋃ i, ↑(AffineSubspace.mk' (b i) (span ℝ (⇑b '' (Set.univ \ {i}))))

Tactic:
← Finset.sum_erase_add _ _ (Finset.mem_univ i),

Goal state after:
E : Type u_1
ι : Type u_2
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : NormedSpace ℝ E
b : Basis ι ℝ E
inst✝³ : Fintype ι
inst✝² : MeasurableSpace E
μ : Measure E
inst✝¹ : BorelSpace E
inst✝ : μ.IsAddHaarMeasure
this✝ : FiniteDimensional ℝ E
x : E
hx : (∀ (i : ι), 0 ≤ (b.repr x) i ∧ (b.repr x) i ≤ 1) ∧ ∃ x_1, 0 ≤ (b.repr x) x_1 → 1 ≤ (b.repr x) x_1
i : ι
hi : 0 ≤ (b.repr x) i → 1 ≤ (b.repr x) i
this : (b.repr x) i = 1
⊢ ∑ x_1 ∈ Finset.univ.erase i, (b.repr x) x_1 • b x_1 + (b.repr x) i • b i ∈
    ⋃ i, ↑(AffineSubspace.mk' (b i) (span ℝ (⇑b '' (Set.univ \ {i}))))
Module: Mathlib.Analysis.BoxIntegral.Partition.Basic

Goal state before:
pp: ι : Type u_1
I : Box ι
π : Prepartition I
p : Box ι → Prop
⊢ ↑(π.filter p).boxes ⊆ ↑π.boxes

Tactic:
filter_boxes,

Goal state after:
ι : Type u_1
I : Box ι
π : Prepartition I
p : Box ι → Prop
⊢ ↑({J ∈ π.boxes | p J}) ⊆ ↑π.boxes
Module: Mathlib.Analysis.BoxIntegral.Partition.Tagged

Goal state before:
pp: ι : Type u_1
I : Box ι
p : (ι → ℝ) → Box ι → Prop
π : Prepartition I
πi : (J : Box ι) → TaggedPrepartition J
⊢ (∀ J ∈ π.biUnionTagged πi, p ((π.biUnionTagged πi).tag J) J) ↔ ∀ J ∈ π, ∀ J' ∈ πi J, p ((πi J).tag J') J'

Tactic:
simp only [mem_biUnionTagged]

Goal state after:
ι : Type u_1
I : Box ι
p : (ι → ℝ) → Box ι → Prop
π : Prepartition I
πi : (J : Box ι) → TaggedPrepartition J
⊢ (∀ (J : Box ι), (∃ J' ∈ π, J ∈ πi J') → p ((π.biUnionTagged πi).tag J) J) ↔ ∀ J ∈ π, ∀ J' ∈ πi J, p ((πi J).tag J') J'
Module: Mathlib.Analysis.BoxIntegral.Partition.Tagged

Goal state before:
pp: ι : Type u_1
I J✝ : Box ι
π π₁✝ π₂✝ : TaggedPrepartition I
x : ι → ℝ
r r₁ r₂ : (ι → ℝ) → ↑(Set.Ioi 0)
π₁ π₂ : TaggedPrepartition I
h : Disjoint π₁.iUnion π₂.iUnion
J : Box ι
⊢ π₁.boxes.piecewise π₁.tag π₂.tag J ∈ Box.Icc I

Tactic:
dsimp only [Finset.piecewise]
    split_ifs
    exacts [π₁.tag_mem_Icc J, π₂.tag_mem_Icc J]

Goal state after:
Module: Mathlib.Analysis.InnerProductSpace.PiL2

Goal state before:
pp: ι : Type u_1
𝕜 : Type u_3
inst✝³ : RCLike 𝕜
E : Type u_4
inst✝² : NormedAddCommGroup E
inst✝¹ : InnerProductSpace 𝕜 E
inst✝ : Fintype ι
b : OrthonormalBasis ι 𝕜 E
x : E
⊢ ∑ i, ⟪b i, x⟫_𝕜 • b i = ∑ i, (b.repr x).ofLp i • b i

Tactic:
simp_rw [b.repr_apply_apply x]

Goal state after:
Module: Mathlib.Analysis.BoxIntegral.Partition.Split

Goal state before:
pp: ι : Type u_1
I J : Box ι
h : I ≤ J
i : ι
x : ℝ
⊢ ∀ ⦃x_1 : Box ι⦄,
    (∃ J', (↑J' = ↑J ∩ {y | y i ≤ x} ∨ ↑J' = ↑J ∩ {y | x < y i}) ∧ ↑x_1 = ↑I ∩ ↑J') →
      ↑x_1 = ↑I ∩ {y | y i ≤ x} ∨ ↑x_1 = ↑I ∩ {y | x < y i}

Tactic:
have : ∀ s, (I ∩ s : Set (ι → ℝ)) ⊆ J := fun s => inter_subset_left.trans h

Goal state after:
ι : Type u_1
I J : Box ι
h : I ≤ J
i : ι
x : ℝ
this : ∀ (s : Set (ι → ℝ)), ↑I ∩ s ⊆ ↑J
⊢ ∀ ⦃x_1 : Box ι⦄,
    (∃ J', (↑J' = ↑J ∩ {y | y i ≤ x} ∨ ↑J' = ↑J ∩ {y | x < y i}) ∧ ↑x_1 = ↑I ∩ ↑J') →
      ↑x_1 = ↑I ∩ {y | y i ≤ x} ∨ ↑x_1 = ↑I ∩ {y | x < y i}
Module: Mathlib.Analysis.InnerProductSpace.PiL2

Goal state before:
pp: ι : Type u_1
ι' : Type u_2
𝕜 : Type u_3
inst✝⁶ : RCLike 𝕜
E : Type u_4
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : InnerProductSpace 𝕜 E
inst✝³ : Fintype ι
E' : Type u_7
inst✝² : Fintype ι'
inst✝¹ : NormedAddCommGroup E'
inst✝ : InnerProductSpace 𝕜 E'
b : OrthonormalBasis ι 𝕜 E
b' : OrthonormalBasis ι' 𝕜 E'
e : ι ≃ ι'
⊢ (b.equiv b' e).symm = b'.equiv b e.symm

Tactic:
apply b'.toBasis.ext_linearIsometryEquiv

Goal state after:
ι : Type u_1
ι' : Type u_2
𝕜 : Type u_3
inst✝⁶ : RCLike 𝕜
E : Type u_4
inst✝⁵ : NormedAddCommGroup E
inst✝⁴ : InnerProductSpace 𝕜 E
inst✝³ : Fintype ι
E' : Type u_7
inst✝² : Fintype ι'
inst✝¹ : NormedAddCommGroup E'
inst✝ : InnerProductSpace 𝕜 E'
b : OrthonormalBasis ι 𝕜 E
b' : OrthonormalBasis ι' 𝕜 E'
e : ι ≃ ι'
⊢ ∀ (i : ι'), (b.equiv b' e).symm (b'.toBasis i) = (b'.equiv b e.symm) (b'.toBasis i)
Module: Mathlib.Algebra.Module.ZLattice.Basic

Goal state before:
pp: E : Type u_4
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
inst✝ : FiniteDimensional ℝ E
s : Set E
hs : DiscreteTopology ↥(span ℤ s)
F : Submodule ℝ E := span ℝ s
L : Submodule ℤ ↥(span ℝ s) := comap (Submodule.restrictScalars ℤ F).subtype (span ℤ s)
f : ↥(comap (Submodule.restrictScalars ℤ (span ℝ s)).subtype (span ℤ s)) ≃ₗ[ℤ] ↥(span ℤ s) := comapSubtypeEquivOfLe ⋯
this : DiscreteTopology ↥L
⊢ Set.finrank ℝ s = Set.finrank ℤ s

Tactic:
have : IsZLattice ℝ L := ⟨eq_top_iff.mpr <|
    span_span_coe_preimage.symm.le.trans (span_mono (Set.preimage_mono subset_span))⟩

Goal state after:
E : Type u_4
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
inst✝ : FiniteDimensional ℝ E
s : Set E
hs : DiscreteTopology ↥(span ℤ s)
F : Submodule ℝ E := span ℝ s
L : Submodule ℤ ↥(span ℝ s) := comap (Submodule.restrictScalars ℤ F).subtype (span ℤ s)
f : ↥(comap (Submodule.restrictScalars ℤ (span ℝ s)).subtype (span ℤ s)) ≃ₗ[ℤ] ↥(span ℤ s) := comapSubtypeEquivOfLe ⋯
this✝ : DiscreteTopology ↥L
this : IsZLattice ℝ L
⊢ Set.finrank ℝ s = Set.finrank ℤ s
Module: Mathlib.Analysis.Oscillation

Goal state before:
pp: E : Type u
F : Type v
inst✝¹ : PseudoEMetricSpace F
inst✝ : TopologicalSpace E
f : E → F
D : Set E
x : E
hf : ContinuousWithinAt f D x
⊢ oscillationWithin f D x ≤ 0

Tactic:
refine _root_.le_of_forall_pos_le_add fun ε hε ↦ ?_

Goal state after:
E : Type u
F : Type v
inst✝¹ : PseudoEMetricSpace F
inst✝ : TopologicalSpace E
f : E → F
D : Set E
x : E
hf : ContinuousWithinAt f D x
ε : ℝ≥0∞
hε : 0 < ε
⊢ oscillationWithin f D x ≤ 0 + ε
Module: Mathlib.Analysis.InnerProductSpace.PiL2

Goal state before:
pp: ι : Type u_1
ι' : Type u_2
𝕜 : Type u_3
inst✝¹⁰ : RCLike 𝕜
E✝ : Type u_4
inst✝⁹ : NormedAddCommGroup E✝
inst✝⁸ : InnerProductSpace 𝕜 E✝
F : Type u_5
inst✝⁷ : NormedAddCommGroup F
inst✝⁶ : InnerProductSpace ℝ F
F' : Type u_6
inst✝⁵ : NormedAddCommGroup F'
inst✝⁴ : InnerProductSpace ℝ F'
inst✝³ : Fintype ι
V : Type u_7
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace 𝕜 V
inst✝ : FiniteDimensional 𝕜 V
S : Submodule 𝕜 V
L✝ L : ↥S →ₗᵢ[𝕜] V
d : ℕ := finrank 𝕜 ↥Sᗮ
LS : Submodule 𝕜 V := L.range
E : ↥Sᗮ ≃ₗᵢ[𝕜] ↥LSᗮ
L3 : ↥Sᗮ →ₗᵢ[𝕜] V := LSᗮ.subtypeₗᵢ.comp E.toLinearIsometry
this✝ : CompleteSpace ↥S
this : CompleteSpace V
p1 : V →ₗ[𝕜] ↥S := ↑S.orthogonalProjectionOnto
p2 : V →ₗ[𝕜] ↥Sᗮ := ↑Sᗮ.orthogonalProjectionOnto
M : V →ₗ[𝕜] V := L.toLinearMap ∘ₗ p1 + L3.toLinearMap ∘ₗ p2
x : V
⊢ M x = L (p1 x) + L3 (p2 x)

Tactic:
simp only [M, LinearMap.add_apply, LinearMap.comp_apply, LinearMap.comp_apply,
        LinearIsometry.coe_toLinearMap]

Goal state after:
Module: Mathlib.Analysis.InnerProductSpace.GramSchmidtOrtho

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_3
inst✝² : LinearOrder ι
inst✝¹ : LocallyFiniteOrderBot ι
inst✝ : WellFoundedLT ι
v : ι → E
i j : ι
hij : i < j
⊢ ⟪gramSchmidt 𝕜 v j, gramSchmidt 𝕜 v i⟫_𝕜 +
      ∑ x < i, ⟪gramSchmidt 𝕜 v x, v i⟫_𝕜 / ↑‖gramSchmidt 𝕜 v x‖ ^ 2 * ⟪gramSchmidt 𝕜 v j, gramSchmidt 𝕜 v x⟫_𝕜 =
    0

Tactic:
set b : ι → E := gramSchmidt 𝕜 v

Goal state after:
𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_3
inst✝² : LinearOrder ι
inst✝¹ : LocallyFiniteOrderBot ι
inst✝ : WellFoundedLT ι
v : ι → E
i j : ι
hij : i < j
b : ι → E := gramSchmidt 𝕜 v
⊢ ⟪b j, b i⟫_𝕜 + ∑ x < i, ⟪b x, v i⟫_𝕜 / ↑‖b x‖ ^ 2 * ⟪b j, b x⟫_𝕜 = 0
Module: Mathlib.Analysis.BoxIntegral.Integrability

Goal state before:
pp: case hbc.refine_2
ι : Type u
E : Type v
inst✝³ : Fintype ι
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
l : IntegrationParams
hl : l.bRiemann = false
s : Set (ι → ℝ)
hs : MeasurableSet s
I : Box ι
y : E
μ : Measure (ι → ℝ)
inst✝ : IsLocallyFiniteMeasure μ
ε : ℝ≥0
ε0 : 0 < ε
A : μ (s ∩ Box.Icc I) ≠ ∞
B : μ (s ∩ ↑I) ≠ ∞
F : Set (ι → ℝ)
hFs : F ⊆ s ∩ Box.Icc I
hFc : IsClosed F
hμF : μ ((s ∩ Box.Icc I) \ F) < ↑ε
U : Set (ι → ℝ)
hsU : s ∩ Box.Icc I ⊆ U
hUo : IsOpen U
hUt : μ U < ∞
hμU : μ (U \ (s ∩ Box.Icc I)) < ↑ε
rs : (ι → ℝ) → ↑(Set.Ioi 0)
hrsU : ∀ x ∈ s ∩ Box.Icc I, closedBall x ↑(rs x) ⊆ U
rs' : (ι → ℝ) → ↑(Set.Ioi 0)
hrs'F : ∀ x ∈ Box.Icc I \ s, closedBall x ↑(rs' x) ⊆ Fᶜ
r : (ι → ℝ) → ↑(Set.Ioi 0) := s.piecewise rs rs'
c : ℝ≥0
π : TaggedPrepartition I
hπ : l.MemBaseSet I c ((fun x ↦ r) c) π
hπp : π.IsPartition
t : Set (ι → ℝ) := (π.filter fun x ↦ π.tag x ∈ s).iUnion
htU : t ⊆ U ∩ ↑I
hμt : μ t ≠ ∞
x : ι → ℝ
hxt : x ∉ t
hxs : x ∈ s
hxI : x ∈ ↑I
⊢ x ∈ (s ∩ Box.Icc I) \ F

Tactic:
refine ⟨⟨hxs, Box.coe_subset_Icc hxI⟩, fun hxF => hxt ?_⟩

Goal state after:
case hbc.refine_2
ι : Type u
E : Type v
inst✝³ : Fintype ι
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
l : IntegrationParams
hl : l.bRiemann = false
s : Set (ι → ℝ)
hs : MeasurableSet s
I : Box ι
y : E
μ : Measure (ι → ℝ)
inst✝ : IsLocallyFiniteMeasure μ
ε : ℝ≥0
ε0 : 0 < ε
A : μ (s ∩ Box.Icc I) ≠ ∞
B : μ (s ∩ ↑I) ≠ ∞
F : Set (ι → ℝ)
hFs : F ⊆ s ∩ Box.Icc I
hFc : IsClosed F
hμF : μ ((s ∩ Box.Icc I) \ F) < ↑ε
U : Set (ι → ℝ)
hsU : s ∩ Box.Icc I ⊆ U
hUo : IsOpen U
hUt : μ U < ∞
hμU : μ (U \ (s ∩ Box.Icc I)) < ↑ε
rs : (ι → ℝ) → ↑(Set.Ioi 0)
hrsU : ∀ x ∈ s ∩ Box.Icc I, closedBall x ↑(rs x) ⊆ U
rs' : (ι → ℝ) → ↑(Set.Ioi 0)
hrs'F : ∀ x ∈ Box.Icc I \ s, closedBall x ↑(rs' x) ⊆ Fᶜ
r : (ι → ℝ) → ↑(Set.Ioi 0) := s.piecewise rs rs'
c : ℝ≥0
π : TaggedPrepartition I
hπ : l.MemBaseSet I c ((fun x ↦ r) c) π
hπp : π.IsPartition
t : Set (ι → ℝ) := (π.filter fun x ↦ π.tag x ∈ s).iUnion
htU : t ⊆ U ∩ ↑I
hμt : μ t ≠ ∞
x : ι → ℝ
hxt : x ∉ t
hxs : x ∈ s
hxI : x ∈ ↑I
hxF : x ∈ F
⊢ x ∈ t
Module: Mathlib.Analysis.InnerProductSpace.GramSchmidtOrtho

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_3
inst✝² : LinearOrder ι
inst✝¹ : LocallyFiniteOrderBot ι
inst✝ : WellFoundedLT ι
f : ι → E
n : ι
hn : (↑‖gramSchmidt 𝕜 f n‖)⁻¹ • gramSchmidt 𝕜 f n ≠ 0
⊢ ‖(↑‖gramSchmidt 𝕜 f n‖)⁻¹ • gramSchmidt 𝕜 f n‖ = 1

Tactic:
norm_smul_inv_norm

Goal state after:
𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_3
inst✝² : LinearOrder ι
inst✝¹ : LocallyFiniteOrderBot ι
inst✝ : WellFoundedLT ι
f : ι → E
n : ι
hn : (↑‖gramSchmidt 𝕜 f n‖)⁻¹ • gramSchmidt 𝕜 f n ≠ 0
⊢ 1 = 1

𝕜 : Type u_1
E : Type u_2
inst✝⁵ : RCLike 𝕜
inst✝⁴ : NormedAddCommGroup E
inst✝³ : InnerProductSpace 𝕜 E
ι : Type u_3
inst✝² : LinearOrder ι
inst✝¹ : LocallyFiniteOrderBot ι
inst✝ : WellFoundedLT ι
f : ι → E
n : ι
hn : (↑‖gramSchmidt 𝕜 f n‖)⁻¹ • gramSchmidt 𝕜 f n ≠ 0
⊢ gramSchmidt 𝕜 f n ≠ 0
Module: Mathlib.Analysis.BoxIntegral.Integrability

Goal state before:
pp: case succ
ι : Type u
E : Type v
inst✝³ : Fintype ι
inst✝² : NormedAddCommGroup E
inst✝¹ : NormedSpace ℝ E
l : IntegrationParams
I : Box ι
f : (ι → ℝ) → E
μ : Measure (ι → ℝ)
inst✝ : IsLocallyFiniteMeasure μ
hl : l.bRiemann = false
ε : ℝ≥0
ε0 : 0 < ε
δ : ℕ → ℝ≥0
δ0 : ∀ (i : ℕ), 0 < δ i
c : ℝ≥0
hδc : HasSum δ c
hcε : c < ε
this : Fact (μ ↑I < ∞)
hf : (μ.restrict ↑I) {x | f x ≠ 0} = 0
N : (ι → ℝ) → ℕ := fun x ↦ ⌈‖f x‖⌉₊
N0 : ∀ {x : ι → ℝ}, N x = 0 ↔ f x = 0
n : ℕ
⊢ (μ.restrict ↑I) (N ⁻¹' {n + 1}) < ↑(δ (n + 1)) / ↑(n + 1)

Tactic:
refine (measure_mono_null ?_ hf).le.trans_lt ?_
      · exact fun x hxN hxf => n.succ_ne_zero ((Eq.symm hxN).trans <| N0.2 hxf)
      · simp [(δ0 _).ne']

Goal state after: