mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.LinearAlgebra.Ray

Goal state before:
pp: case inr.inr.refine_2
R : Type u_1
inst✝⁴ : Field R
inst✝³ : LinearOrder R
inst✝² : IsStrictOrderedRing R
M : Type u_2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
v₁ v₂ : M
r₁ r₂ : R
h₁ : 0 < r₁
h₂ : 0 < r₂
H : r₁ • v₁ = r₂ • v₂
h₁₂ : 0 < r₁ + r₂
⊢ v₁ = (r₂ / (r₁ + r₂)) • (v₁ + v₂)

Tactic:
rw [div_eq_inv_mul, mul_smul, smul_add, ← H, ← add_smul, add_comm r₂, inv_smul_smul₀ h₁₂.ne']

Goal state after:
Module: Mathlib.Analysis.Convex.Segment

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝⁴ : Field 𝕜
inst✝³ : LinearOrder 𝕜
inst✝² : IsStrictOrderedRing 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
x y z : E
h : SameRay 𝕜 (x - y) (z - x)
a b : 𝕜
ha : 0 ≤ a
hb : 0 ≤ b
hab : a + b = 1
hxy : x - y = a • (z - y)
hzx : z - x = b • (z - y)
⊢ 0 ∈ [-x + y -[𝕜] -x + z]

Tactic:
refine ⟨b, a, hb, ha, add_comm a b ▸ hab, ?_⟩

Goal state after:
𝕜 : Type u_1
E : Type u_2
inst✝⁴ : Field 𝕜
inst✝³ : LinearOrder 𝕜
inst✝² : IsStrictOrderedRing 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
x y z : E
h : SameRay 𝕜 (x - y) (z - x)
a b : 𝕜
ha : 0 ≤ a
hb : 0 ≤ b
hab : a + b = 1
hxy : x - y = a • (z - y)
hzx : z - x = b • (z - y)
⊢ b • (-x + y) + a • (-x + z) = 0
Module: Mathlib.Analysis.Convex.Star

Goal state before:
pp: case inr.inr.inr
𝕜 : Type u_1
E : Type u_2
inst✝³ : Semiring 𝕜
inst✝² : PartialOrder 𝕜
inst✝¹ : AddCommMonoid E
inst✝ : Module 𝕜 E
x : E
s : Set E
hx : x ∈ s
h : ∀ ⦃y : E⦄, y ∈ s → x ≠ y → ∀ ⦃a b : 𝕜⦄, 0 < a → 0 < b → a + b = 1 → a • x + b • y ∈ s
y : E
hy : y ∈ s
a b : 𝕜
ha : 0 ≤ a
hb : 0 ≤ b
hab : a + b = 1
ha' : 0 < a
hb' : 0 < b
hxy : x ≠ y
⊢ a • x + b • y ∈ s

Tactic:
exact h hy hxy ha' hb' hab

Goal state after:
Module: Mathlib.Analysis.Convex.Segment

Goal state before:
pp: case inl
𝕜 : Type u_1
E : Type u_2
inst✝⁴ : Field 𝕜
inst✝³ : LinearOrder 𝕜
inst✝² : IsStrictOrderedRing 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
x y : E
c a : 𝕜
h₀ : 0 < a
h₁ : a < 1
hac : a < c
⊢ (lineMap x y) a ∈ ⇑(lineMap x ((lineMap x y) c)) '' Ioo 0 1

Tactic:
have hc : 0 < c := h₀.trans hac

Goal state after:
case inl
𝕜 : Type u_1
E : Type u_2
inst✝⁴ : Field 𝕜
inst✝³ : LinearOrder 𝕜
inst✝² : IsStrictOrderedRing 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
x y : E
c a : 𝕜
h₀ : 0 < a
h₁ : a < 1
hac : a < c
hc : 0 < c
⊢ (lineMap x y) a ∈ ⇑(lineMap x ((lineMap x y) c)) '' Ioo 0 1
Module: Mathlib.Analysis.Convex.Basic

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝³ : Semiring 𝕜
inst✝² : PartialOrder 𝕜
inst✝¹ : AddCommMonoid E
inst✝ : SMul 𝕜 E
s : Set E
P : Prop
hs : Convex 𝕜 s
⊢ Convex 𝕜 {x | P → x ∈ s}

Tactic:
by_cases hP : P <;> simp [hP, hs, convex_univ]

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Defs

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s : AffineSubspace k P
p : P
hp : p ∈ s
v : V
⊢ v ∈ (fun x ↦ x -ᵥ p) '' ↑s ↔ ∃ p₂ ∈ s, v = p₂ -ᵥ p

Tactic:
exact ⟨fun ⟨p₂, hp₂, hv⟩ => ⟨p₂, hp₂, hv.symm⟩, fun ⟨p₂, hp₂, hv⟩ => ⟨p₂, hp₂, hv.symm⟩⟩

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Defs

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s : AffineSubspace k P
p : P
hp : p ∈ s
v : V
⊢ v ∈ (fun x ↦ p -ᵥ x) '' ↑s ↔ ∃ p₂ ∈ s, v = p -ᵥ p₂

Tactic:
exact ⟨fun ⟨p₂, hp₂, hv⟩ => ⟨p₂, hp₂, hv.symm⟩, fun ⟨p₂, hp₂, hv⟩ => ⟨p₂, hp₂, hv.symm⟩⟩

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Defs

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝² : Ring k
inst✝¹ : AddCommGroup V
inst✝ : Module k V
S : AffineSpace V P
⊢ ⊥ ≠ ⊤

Tactic:
by
  intro contra
  rw [AffineSubspace.ext_iff, bot_coe, top_coe] at contra
  exact Set.empty_ne_univ contra

Goal state after:
Module: Mathlib.Analysis.Convex.Basic

Goal state before:
pp: case inr
𝕜 : Type u_1
E : Type u_2
inst✝⁶ : Semiring 𝕜
inst✝⁵ : PartialOrder 𝕜
inst✝⁴ : AddCommMonoid E
inst✝³ : PartialOrder E
inst✝² : IsOrderedAddMonoid E
inst✝¹ : Module 𝕜 E
inst✝ : PosSMulMono 𝕜 E
s : Set E
hs : s.OrdConnected
h : IsChain (fun x1 x2 ↦ x1 ≤ x2) s
x : E
hx : x ∈ s
y : E
hy : y ∈ s
hyx : y ≤ x
⊢ [x -[𝕜] y] ⊆ s

Tactic:
rw [segment_symm]
    exact (segment_subset_Icc hyx).trans (hs.out hy hx)

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Defs

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝² : Ring k
inst✝¹ : AddCommGroup V
inst✝ : Module k V
S : AffineSpace V P
Q : AffineSubspace k P
⊢ Q = ⊥ ∨ (↑Q).Nonempty

Tactic:
rw [nonempty_iff_ne_bot]

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_3
inst✝² : Ring k
inst✝¹ : AddCommGroup V
inst✝ : Module k V
S : AffineSpace V P
Q : AffineSubspace k P
⊢ Q = ⊥ ∨ Q ≠ ⊥
Module: Mathlib.Analysis.LocallyConvex.BalancedCoreHull

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
inst✝² : NormedDivisionRing 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
s t : Set E
h : t ⊆ s
ht : Balanced 𝕜 t
x : E
hx : x ∈ t
r : 𝕜
hr : 1 ≤ ‖r‖
⊢ ‖r‖⁻¹ ≤ 1

Tactic:
exact inv_le_one_of_one_le₀ hr

Goal state after:
Module: Mathlib.Analysis.LocallyConvex.Bounded

Goal state before:
pp: 𝕜 : Type u_6
E : Type u_7
inst✝³ : NormedDivisionRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : TopologicalSpace E
S : Set E
⊢ IsVonNBounded 𝕜 S ↔ Tendsto (fun x ↦ x • S) (𝓝 0) (𝓝 0).smallSets

Tactic:
tendsto_smallSets_iff

Goal state after:
𝕜 : Type u_6
E : Type u_7
inst✝³ : NormedDivisionRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : TopologicalSpace E
S : Set E
⊢ IsVonNBounded 𝕜 S ↔ ∀ t ∈ 𝓝 0, ∀ᶠ (x : 𝕜) in 𝓝 0, x • S ⊆ t
Module: Mathlib.Analysis.LocallyConvex.Bounded

Goal state before:
pp: case mp
𝕜 : Type u_1
E : Type u_3
inst✝² : NontriviallyNormedField 𝕜
inst✝¹ : SeminormedAddCommGroup E
inst✝ : NormedSpace 𝕜 E
s : Set E
⊢ Bornology.IsBounded s → ∃ a, s ⊆ a • Metric.closedBall 0 1

Tactic:
isBounded_iff_subset_smul_ball 𝕜

Goal state after:
case mp
𝕜 : Type u_1
E : Type u_3
inst✝² : NontriviallyNormedField 𝕜
inst✝¹ : SeminormedAddCommGroup E
inst✝ : NormedSpace 𝕜 E
s : Set E
⊢ (∃ a, s ⊆ a • Metric.ball 0 1) → ∃ a, s ⊆ a • Metric.closedBall 0 1
Module: Mathlib.Analysis.Convex.Strict

Goal state before:
pp: 𝕜 : Type u_1
𝕝 : Type u_2
E : Type u_3
F : Type u_4
inst✝¹¹ : Semiring 𝕜
inst✝¹⁰ : PartialOrder 𝕜
inst✝⁹ : TopologicalSpace E
inst✝⁸ : TopologicalSpace F
inst✝⁷ : AddCommMonoid E
inst✝⁶ : AddCommMonoid F
inst✝⁵ : Module 𝕜 E
inst✝⁴ : Module 𝕜 F
s : Set E
inst✝³ : Semiring 𝕝
inst✝² : Module 𝕝 E
inst✝¹ : Module 𝕝 F
inst✝ : LinearMap.CompatibleSMul E F 𝕜 𝕝
hs : StrictConvex 𝕜 s
f : E →ₗ[𝕝] F
hf : IsOpenMap ⇑f
⊢ StrictConvex 𝕜 (⇑f '' s)

Tactic:
by
  rintro _ ⟨x, hx, rfl⟩ _ ⟨y, hy, rfl⟩ hxy a b ha hb hab
  refine hf.image_interior_subset _ ⟨a • x + b • y, hs hx hy (ne_of_apply_ne _ hxy) ha hb hab, ?_⟩
  rw [map_add, f.map_smul_of_tower a, f.map_smul_of_tower b]

Goal state after:
Module: Mathlib.Analysis.Convex.Strict

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_3
inst✝⁵ : Semiring 𝕜
inst✝⁴ : PartialOrder 𝕜
inst✝³ : TopologicalSpace E
inst✝² : AddCancelCommMonoid E
inst✝¹ : ContinuousAdd E
inst✝ : Module 𝕜 E
s : Set E
hs : StrictConvex 𝕜 s
z x : E
hx : x ∈ (fun x ↦ z + x) ⁻¹' s
y : E
hy : y ∈ (fun x ↦ z + x) ⁻¹' s
hxy : x ≠ y
a b : 𝕜
ha : 0 < a
hb : 0 < b
hab : a + b = 1
⊢ a • x + b • y ∈ interior ((fun x ↦ z + x) ⁻¹' s)

Tactic:
refine preimage_interior_subset_interior_preimage (continuous_const_add _) ?_

Goal state after:
𝕜 : Type u_1
E : Type u_3
inst✝⁵ : Semiring 𝕜
inst✝⁴ : PartialOrder 𝕜
inst✝³ : TopologicalSpace E
inst✝² : AddCancelCommMonoid E
inst✝¹ : ContinuousAdd E
inst✝ : Module 𝕜 E
s : Set E
hs : StrictConvex 𝕜 s
z x : E
hx : x ∈ (fun x ↦ z + x) ⁻¹' s
y : E
hy : y ∈ (fun x ↦ z + x) ⁻¹' s
hxy : x ≠ y
a b : 𝕜
ha : 0 < a
hb : 0 < b
hab : a + b = 1
⊢ a • x + b • y ∈ (fun x ↦ z + x) ⁻¹' interior s
Module: Mathlib.LinearAlgebra.AffineSpace.Combination

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
S : AffineSpace V P
ι : Type u_4
s : Finset ι
V₂ : Type u_6
P₂ : Type u_7
inst✝² : AddCommGroup V₂
inst✝¹ : Module k V₂
inst✝ : AffineSpace V₂ P₂
p : ι → P
w : ι → k
hw : s.sum w = 1
f : P →ᵃ[k] P₂
b : P
b₂ : P₂
⊢ f ((affineCombination k s p) w) = (affineCombination k s (⇑f ∘ p)) w

Tactic:
s.affineCombination_eq_weightedVSubOfPoint_vadd_of_sum_eq_one w p hw b,

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
S : AffineSpace V P
ι : Type u_4
s : Finset ι
V₂ : Type u_6
P₂ : Type u_7
inst✝² : AddCommGroup V₂
inst✝¹ : Module k V₂
inst✝ : AffineSpace V₂ P₂
p : ι → P
w : ι → k
hw : s.sum w = 1
f : P →ᵃ[k] P₂
b : P
b₂ : P₂
⊢ f ((s.weightedVSubOfPoint p b) w +ᵥ b) = (affineCombination k s (⇑f ∘ p)) w
Module: Mathlib.Analysis.Seminorm

Goal state before:
pp: R : Type u_1
R' : Type u_2
𝕜 : Type u_3
𝕜₂ : Type u_4
𝕜₃ : Type u_5
𝕝 : Type u_6
E : Type u_7
E₂ : Type u_8
E₃ : Type u_9
F : Type u_10
ι : Type u_11
inst✝² : NormedField 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p q : Seminorm 𝕜 E
x : E
s : Set (Seminorm 𝕜 E)
h : BddAbove (DFunLike.coe '' s)
⊢ (⨆ p, ⇑↑p) 0 = 0

Tactic:
by
          rw [iSup_apply, ← @Real.iSup_const_zero s]
          congr!
          rename_i _ _ _ i
          exact map_zero i.1

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Basic

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔ vectorSpan k s₁ = vectorSpan k s₂ ∧ (s₁ = ∅ ↔ s₂ = ∅)

Tactic:
rw [← direction_affineSpan, ← affineSpan_eq_bot k]

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔ (affineSpan k s₁).direction = vectorSpan k s₂ ∧ (affineSpan k s₁ = ⊥ ↔ s₂ = ∅)
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Basic

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔ (affineSpan k s₁).direction = vectorSpan k s₂ ∧ (affineSpan k s₁ = ⊥ ↔ s₂ = ∅)

Tactic:
rw [← direction_affineSpan, ← affineSpan_eq_bot k]

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔
    (affineSpan k s₁).direction = (affineSpan k s₂).direction ∧ (affineSpan k s₁ = ⊥ ↔ affineSpan k s₂ = ⊥)
Module: Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Basic

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔
    (affineSpan k s₁).direction = (affineSpan k s₂).direction ∧ (affineSpan k s₁ = ⊥ ↔ affineSpan k s₂ = ⊥)

Tactic:
rw [← direction_affineSpan, ← affineSpan_eq_bot k]

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
s₁ s₂ : Set P
⊢ affineSpan k s₁ ∥ affineSpan k s₂ ↔
    (affineSpan k s₁).direction = (affineSpan k s₂).direction ∧ (affineSpan k s₁ = ⊥ ↔ affineSpan k s₂ = ⊥)
Module: Mathlib.LinearAlgebra.AffineSpace.Combination

Goal state before:
pp: case mp.inr
ι : Type u_1
k : Type u_2
V : Type u_3
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
v : V
p : ι → P
i0 : ι
⊢ v ∈ vectorSpan k (Set.range p) → ∃ s w, ∑ i ∈ s, w i = 0 ∧ v = (s.weightedVSub p) w

Tactic:
rw [vectorSpan_range_eq_span_range_vsub_right k p i0, ← Set.image_univ,
          Finsupp.mem_span_image_iff_linearCombination]
        rintro ⟨l, _, hv⟩
        use insert i0 l.support
        set w :=
          (l : ι → k) - Function.update (Function.const ι 0 : ι → k) i0 (∑ i ∈ l.support, l i) with
          hwdef
        use w
        have hw : ∑ i ∈ insert i0 l.support, w i = 0 := by
          rw [hwdef]
          simp_rw [Pi.sub_apply, Finset.sum_sub_distrib,
            Finset.sum_update_of_mem (Finset.mem_insert_self _ _),
            Finset.sum_insert_of_eq_zero_if_notMem Finsupp.notMem_support_iff.1]
          simp only [Function.const_apply, Finset.sum_const_zero, add_zero, sub_self]
        use hw
        have hz : w i0 • (p i0 -ᵥ p i0 : V) = 0 := (vsub_self (p i0)).symm ▸ smul_zero _
        change (fun i => w i • (p i -ᵥ p i0 : V)) i0 = 0 at hz
        rw [Finset.weightedVSub_eq_weightedVSubOfPoint_of_sum_eq_zero _ w p hw (p i0),
          Finset.weightedVSubOfPoint_apply, ← hv, Finsupp.linearCombination_apply,
          @Finset.sum_insert_zero _ _ l.support i0 _ _ _ hz]
        change (∑ i ∈ l.support, l i • _) = _
        congr with i
        by_cases h : i = i0
        · simp [h]
        · simp [hwdef, h]

Goal state after:
Module: Mathlib.Analysis.Seminorm

Goal state before:
pp: 𝕜 : Type u_3
E : Type u_7
inst✝⁵ : NontriviallyNormedField 𝕜
inst✝⁴ : AddCommGroup E
inst✝³ : Module 𝕜 E
ι : Sort u_12
inst✝² : UniformSpace E
inst✝¹ : IsUniformAddGroup E
inst✝ : ContinuousConstSMul 𝕜 E
p' : ι → Prop
s : ι → Set E
p : Seminorm 𝕜 E
hb : (𝓝 0).HasBasis p' s
h₁ : ∃ r, p.closedBall 0 r ∈ 𝓝 0
h₂ : ∀ (i : ι), p' i → ∃ r > 0, p.ball 0 r ⊆ s i
⊢ inst✝² = PseudoMetricSpace.toUniformSpace

Tactic:
by
  refine IsUniformAddGroup.ext ‹_›
    p.toAddGroupSeminorm.toSeminormedAddCommGroup.to_isUniformAddGroup ?_
  apply le_antisymm
  · rw [← @comap_norm_nhds_zero E p.toAddGroupSeminorm.toSeminormedAddGroup, ← tendsto_iff_comap]
    suffices Continuous p from this.tendsto' 0 _ (map_zero p)
    rcases h₁ with ⟨r, hr⟩
    exact p.continuous' hr
  · rw [(@NormedAddGroup.nhds_zero_basis_norm_lt E
      p.toAddGroupSeminorm.toSeminormedAddGroup).le_basis_iff hb]
    simpa only [subset_def, mem_ball_zero] using! h₂

Goal state after:
Module: Mathlib.Analysis.Seminorm

Goal state before:
pp: case refine_2
𝕜 : Type u_3
E : Type u_7
inst✝² : NormedField 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : Seminorm 𝕜 E
c : 𝕜
hc : 1 < ‖c‖
ε : ℝ
εpos : 0 < ε
x : E
hx : p x ≠ 0
xεpos : 0 < p x / ε
n : ℤ
hn : p x / ε ∈ Ico (‖c‖ ^ n) (‖c‖ ^ (n + 1))
cpos : 0 < ‖c‖
cnpos : 0 < ‖c ^ (n + 1)‖
⊢ p (c ^ (-(n + 1)) • x) < ε

Tactic:
rw [map_smul_eq_mul, zpow_neg, norm_inv, ← div_eq_inv_mul, div_lt_iff₀ cnpos, mul_comm,
        norm_zpow]

Goal state after:
case refine_2
𝕜 : Type u_3
E : Type u_7
inst✝² : NormedField 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : Seminorm 𝕜 E
c : 𝕜
hc : 1 < ‖c‖
ε : ℝ
εpos : 0 < ε
x : E
hx : p x ≠ 0
xεpos : 0 < p x / ε
n : ℤ
hn : p x / ε ∈ Ico (‖c‖ ^ n) (‖c‖ ^ (n + 1))
cpos : 0 < ‖c‖
cnpos : 0 < ‖c ^ (n + 1)‖
⊢ p x < ‖c‖ ^ (n + 1) * ε
Module: Mathlib.Analysis.Seminorm

Goal state before:
pp: case refine_3
𝕜 : Type u_3
E : Type u_7
inst✝² : NormedField 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : Seminorm 𝕜 E
c : 𝕜
hc : 1 < ‖c‖
ε : ℝ
εpos : 0 < ε
x : E
hx : p x ≠ 0
xεpos : 0 < p x / ε
n : ℤ
hn : p x / ε ∈ Ico (‖c‖ ^ n) (‖c‖ ^ (n + 1))
cpos : 0 < ‖c‖
cnpos : 0 < ‖c ^ (n + 1)‖
⊢ ε / ‖c‖ ≤ p ((c ^ (n + 1))⁻¹ • x)

Tactic:
div_le_iff₀ cpos,

Goal state after:
case refine_3
𝕜 : Type u_3
E : Type u_7
inst✝² : NormedField 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : Seminorm 𝕜 E
c : 𝕜
hc : 1 < ‖c‖
ε : ℝ
εpos : 0 < ε
x : E
hx : p x ≠ 0
xεpos : 0 < p x / ε
n : ℤ
hn : p x / ε ∈ Ico (‖c‖ ^ n) (‖c‖ ^ (n + 1))
cpos : 0 < ‖c‖
cnpos : 0 < ‖c ^ (n + 1)‖
⊢ ε ≤ p ((c ^ (n + 1))⁻¹ • x) * ‖c‖
Module: Mathlib.LinearAlgebra.AffineSpace.Independent

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁶ : Ring k
inst✝⁵ : AddCommGroup V
inst✝⁴ : Module k V
inst✝³ : AffineSpace V P
ι : Type u_4
V₂ : Type u_5
P₂ : Type u_6
inst✝² : AddCommGroup V₂
inst✝¹ : Module k V₂
inst✝ : AffineSpace V₂ P₂
p : ι → P
f : P →ᵃ[k] P₂
hai : AffineIndependent k (⇑f ∘ p)
⊢ AffineIndependent k p

Tactic:
by
  rcases isEmpty_or_nonempty ι with h | h
  · apply affineIndependent_of_subsingleton
  obtain ⟨i⟩ := h
  rw [affineIndependent_iff_linearIndependent_vsub k p i]
  simp_rw [affineIndependent_iff_linearIndependent_vsub k (f ∘ p) i, Function.comp_apply, ←
    f.linearMap_vsub] at hai
  exact LinearIndependent.of_comp f.linear hai

Goal state after:
Module: Mathlib.Analysis.Seminorm

Goal state before:
pp: 𝕜 : Type u_3
E : Type u_7
inst✝² : NormedField 𝕜
inst✝¹ : SeminormedAddCommGroup E
inst✝ : NormedSpace 𝕜 E
r : ℝ
x : E
hx : ‖x‖ < r
⊢ Absorbent 𝕜 (Metric.ball x r)

Tactic:
rw [← ball_normSeminorm 𝕜]
  exact (normSeminorm 𝕜 _).absorbent_ball hx

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic

Goal state before:
pp: case refine_1
k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
I : Set k
m n : ℕ
s : Simplex k P n
e : Fin (n + 1) ≃ Fin (m + 1)
w : Fin (m + 1) → k
hw : ∑ i, w i = 1
hwI : ∀ (i : Fin (m + 1)), w i ∈ I
x✝ : (affineCombination k univ (s.reindex e).points) w ∈ Simplex.setInterior I (s.reindex e)
⊢ (affineCombination k univ (s.reindex e).points) w ∈ Simplex.setInterior I s

Tactic:
reindex

Goal state after:
case refine_1
k : Type u_1
V : Type u_2
P : Type u_4
inst✝³ : Ring k
inst✝² : AddCommGroup V
inst✝¹ : Module k V
inst✝ : AffineSpace V P
I : Set k
m n : ℕ
s : Simplex k P n
e : Fin (n + 1) ≃ Fin (m + 1)
w : Fin (m + 1) → k
hw : ∑ i, w i = 1
hwI : ∀ (i : Fin (m + 1)), w i ∈ I
x✝ : (affineCombination k univ (s.reindex e).points) w ∈ Simplex.setInterior I (s.reindex e)
⊢ (affineCombination k univ (s.points ∘ ⇑e.symm)) w ∈ Simplex.setInterior I s
Module: Mathlib.LinearAlgebra.AffineSpace.Independent

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁴ : Ring k
inst✝³ : AddCommGroup V
inst✝² : Module k V
inst✝¹ : AffineSpace V P
ι : Type u_4
inst✝ : Nontrivial k
p : ι → P
ha : AffineIndependent k p
s₁ s₂ : Set ι
i : ι
his₁ : i ∈ s₁
his₂ : i ∉ s₂
h₁ : s₁.Nontrivial
j : ι
hj : j ∈ s₁
hne : j ≠ i
he : vectorSpan k (p '' s₁) = vectorSpan k (p '' s₂)
fs : Finset ↑s₂
w : ↑s₂ → k
hw : ∑ i ∈ fs, w i = 0
hs : p i -ᵥ p j = (fs.weightedVSub fun x ↦ p ↑x) w
w' : ι → k := extend Subtype.val w 0
hw' : ∑ t ∈ map (Embedding.subtype fun x ↦ x ∈ s₂) fs, w' t = 0
⊢ False

Tactic:
have hs' : p i -ᵥ p j = (fs.map (Embedding.subtype _)).weightedVSub p w' := by
    rw [hs, weightedVSub_map]
    simp [w', Function.comp_def]

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_3
inst✝⁴ : Ring k
inst✝³ : AddCommGroup V
inst✝² : Module k V
inst✝¹ : AffineSpace V P
ι : Type u_4
inst✝ : Nontrivial k
p : ι → P
ha : AffineIndependent k p
s₁ s₂ : Set ι
i : ι
his₁ : i ∈ s₁
his₂ : i ∉ s₂
h₁ : s₁.Nontrivial
j : ι
hj : j ∈ s₁
hne : j ≠ i
he : vectorSpan k (p '' s₁) = vectorSpan k (p '' s₂)
fs : Finset ↑s₂
w : ↑s₂ → k
hw : ∑ i ∈ fs, w i = 0
hs : p i -ᵥ p j = (fs.weightedVSub fun x ↦ p ↑x) w
w' : ι → k := extend Subtype.val w 0
hw' : ∑ t ∈ map (Embedding.subtype fun x ↦ x ∈ s₂) fs, w' t = 0
hs' : p i -ᵥ p j = ((map (Embedding.subtype fun x ↦ x ∈ s₂) fs).weightedVSub p) w'
⊢ False
Module: Mathlib.Analysis.Convex.StdSimplex

Goal state before:
pp: S : Type u_1
inst✝⁷ : Semiring S
inst✝⁶ : PartialOrder S
X : Type u_2
Y : Type u_3
Z : Type u_4
inst✝⁵ : Fintype X
inst✝⁴ : Fintype Y
inst✝³ : Fintype Z
inst✝² : IsOrderedRing S
inst✝¹ : Nontrivial S
inst✝ : Nontrivial X
x y : X
hxy : x ≠ y
⊢ ∃ x y, x ≠ y

Tactic:
exact ⟨vertex x, vertex y, fun h ↦ hxy (vertex_injective h)⟩

Goal state after:
Module: Mathlib.Analysis.Convex.Combination

Goal state before:
pp: R : Type u_1
E : Type u_3
ι : Type u_5
inst✝² : Field R
inst✝¹ : AddCommGroup E
inst✝ : Module R E
c : R
t : Finset ι
w : ι → R
z : ι → E
⊢ (t.centerMass w fun i ↦ c • z i) = c • t.centerMass w z

Tactic:
by
  simp only [Finset.centerMass, Finset.smul_sum, (mul_smul _ _ _).symm, mul_comm c, mul_assoc]

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_4
inst✝⁴ : Ring k
inst✝³ : AddCommGroup V
inst✝² : Module k V
inst✝¹ : AffineSpace V P
inst✝ : PartialOrder k
n : ℕ
s : Simplex k P n
i : Fin (n + 1)
⊢ ∃ x, Pi.single i 1 x ∉ Set.Ioo 0 1

Tactic:
exact ⟨i, by simp⟩

Goal state after:
Module: Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic

Goal state before:
pp: k : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
inst✝² : AffineSpace V P
inst✝¹ : PartialOrder k
inst✝ : ZeroLEOneClass k
n : ℕ
s : Simplex k P n
fs : Finset (Fin (n + 1))
m : ℕ
h : #fs = m + 1
w : Fin (n + 1) → k
hw1 : ∑ i, w i = 1
hp : (affineCombination k univ s.points) w ∈ (s.face h).closedInterior
hp' : (affineCombination k univ s.points) w ∈ affineSpan k (Set.range s.points)
⊢ (affineCombination k univ s.points) w ∈ s.closedInterior

Tactic:
affineCombination_mem_closedInterior_face_iff_mem_Icc _ _ hw1

Goal state after:
k : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring k
inst✝⁴ : AddCommGroup V
inst✝³ : Module k V
inst✝² : AffineSpace V P
inst✝¹ : PartialOrder k
inst✝ : ZeroLEOneClass k
n : ℕ
s : Simplex k P n
fs : Finset (Fin (n + 1))
m : ℕ
h : #fs = m + 1
w : Fin (n + 1) → k
hw1 : ∑ i, w i = 1
hp : (∀ i ∈ fs, w i ∈ Set.Icc 0 1) ∧ ∀ i ∉ fs, w i = 0
hp' : (affineCombination k univ s.points) w ∈ affineSpan k (Set.range s.points)
⊢ (affineCombination k univ s.points) w ∈ s.closedInterior
Module: Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic

Goal state before:
pp: case h₁
k : Type u_1
V : Type u_2
P : Type u_4
inst✝⁷ : Ring k
inst✝⁶ : AddCommGroup V
inst✝⁵ : Module k V
inst✝⁴ : AffineSpace V P
inst✝³ : LinearOrder k
inst✝² : IsOrderedAddMonoid k
inst✝¹ : ZeroLEOneClass k
n : ℕ
inst✝ : NeZero n
s : Simplex k P n
w : Fin (n + 1) → k
hw1 : ∑ i, w i = 1
hp : ∀ (i : Fin (n + 1)), w i ∈ Set.Icc 0 1
hp' : (affineCombination k univ s.points) w ∈ ↑(affineSpan k (Set.range s.points))
h : ∃ i, w i ≤ 0 ∨ 1 ≤ w i
j : Fin (n + 1)
hj : w j = 0
⊢ (affineCombination k univ s.points) w ∈ (s.face ⋯).closedInterior

Tactic:
affineCombination_mem_closedInterior_face_iff_mem_Icc _ _ hw1

Goal state after:
case h₁
k : Type u_1
V : Type u_2
P : Type u_4
inst✝⁷ : Ring k
inst✝⁶ : AddCommGroup V
inst✝⁵ : Module k V
inst✝⁴ : AffineSpace V P
inst✝³ : LinearOrder k
inst✝² : IsOrderedAddMonoid k
inst✝¹ : ZeroLEOneClass k
n : ℕ
inst✝ : NeZero n
s : Simplex k P n
w : Fin (n + 1) → k
hw1 : ∑ i, w i = 1
hp : ∀ (i : Fin (n + 1)), w i ∈ Set.Icc 0 1
hp' : (affineCombination k univ s.points) w ∈ ↑(affineSpan k (Set.range s.points))
h : ∃ i, w i ≤ 0 ∨ 1 ≤ w i
j : Fin (n + 1)
hj : w j = 0
⊢ (∀ i ∈ {j}ᶜ, w i ∈ Set.Icc 0 1) ∧ ∀ i ∉ {j}ᶜ, w i = 0
Module: Mathlib.Topology.NhdsKer

Goal state before:
pp: X : Type u_2
inst✝ : TopologicalSpace X
s t : Set X
h₁ : s ⊆ t
h₂ : IsOpen[inst✝] t
⊢ nhdsKer s ⊆ t

Tactic:
rw [nhdsKer_def]; exact sInter_subset_of_mem ⟨h₂, h₁⟩

Goal state after: