mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Analysis.Complex.UpperHalfPlane.Metric

Goal state before:
pp: case refine_1
z w : ℍ
r : ℝ
this : ∀ (x : ℍ × ℍ), 2 * √(x.1.im * x.2.im) ≠ 0
⊢ Continuous fun x ↦ dist (id x.1) (id x.2)

Tactic:
apply_rules [Continuous.div, Continuous.mul, continuous_const, Continuous.arsinh,
        Continuous.dist, continuous_coe.comp, continuous_fst, continuous_snd,
        Real.continuous_sqrt.comp, continuous_im.comp]

Goal state after:
Module: Mathlib.Topology.Algebra.Group.Matrix

Goal state before:
pp: case right
R : Type u_4
inst✝² : Ring R
inst✝¹ : TopologicalSpace R
inst✝ : IsTopologicalRing R
i j : Fin 2
⊢ Continuous[inst✝¹, inst✝¹] fun a ↦ !![1, -a; 0, 1] i j

Tactic:
fin_cases i <;> fin_cases j <;> simp [continuous_const, continuous_neg, continuous_id']

Goal state after:
Module: Mathlib.Analysis.Complex.UpperHalfPlane.Metric

Goal state before:
pp: a : { x // 0 < x }
y₁ y₂ : ℍ
⊢ dist (a • y₁) (a • y₂) = dist y₁ y₂

Tactic:
simp only [dist_eq, coe_pos_real_smul, pos_real_im]

Goal state after:
a : { x // 0 < x }
y₁ y₂ : ℍ
⊢ 2 * arsinh (dist (↑a • ↑y₁) (↑a • ↑y₂) / (2 * √(↑a * y₁.im * (↑a * y₂.im)))) =
    2 * arsinh (dist ↑y₁ ↑y₂ / (2 * √(y₁.im * y₂.im)))
Module: Mathlib.Topology.Compactification.OnePoint.Basic

Goal state before:
pp: X : Type u_1
inst✝ : TopologicalSpace X
s : Set (OnePoint X)
h : ∞ ∉ s
⊢ IsOpen[instTopologicalSpace] sᶜ ↔ IsClosed[inst✝] (some ⁻¹' s) ∧ IsCompact (some ⁻¹' s)

Tactic:
isOpen_iff_of_mem (mem_compl h),

Goal state after:
X : Type u_1
inst✝ : TopologicalSpace X
s : Set (OnePoint X)
h : ∞ ∉ s
⊢ IsClosed[inst✝] (some ⁻¹' sᶜ)ᶜ ∧ IsCompact (some ⁻¹' sᶜ)ᶜ ↔ IsClosed[inst✝] (some ⁻¹' s) ∧ IsCompact (some ⁻¹' s)
Module: Mathlib.Topology.Compactification.OnePoint.Basic

Goal state before:
pp: X : Type u_1
Y✝ : Type u_2
inst✝¹ : TopologicalSpace X
s : Set (OnePoint X)
Y : Type u_3
inst✝ : TopologicalSpace Y
f : C(X, Y)
y : Y
h : Tendsto (⇑f) (coclosedCompact X) (𝓝 y)
⊢ Tendsto (fun x ↦ (↑x).elim y ⇑f) (coclosedCompact X) (𝓝 (∞.elim y ⇑f)) ∧
    Continuous[inst✝¹, inst✝] fun x ↦ (↑x).elim y ⇑f

Tactic:
refine ⟨h, f.continuous⟩

Goal state after:
Module: Mathlib.Analysis.Complex.ValueDistribution.LogCounting.Basic

Goal state before:
pp: E : Type u_1
inst✝² : NormedAddCommGroup E
inst✝¹ : DecidableEq E
inst✝ : ProperSpace E
D : locallyFinsupp E ℤ
e : E
hD : single e 1 ≤ D
a : ℝ
ha : a ∈ Ioi ‖e‖
b : ℝ
hb : b ∈ Ioi ‖e‖
hab : a ≤ b
⊢ 0 ≤ D - single e 1

Tactic:
simp [hD]

Goal state after:
Module: Mathlib.Analysis.ConstantSpeed

Goal state before:
pp: case inl.inr
E : Type u_2
inst✝ : PseudoEMetricSpace E
f : ℝ → E
l : ℝ≥0
x y z : ℝ
hfs : HasConstantSpeedOnWith f (Icc x y) l
hft : HasConstantSpeedOnWith f (Icc y z) l
xy : x ≤ y
zy : z ≤ y
u : ℝ
xu : x ≤ u
uz : u ≤ z
v : ℝ
xv : x ≤ v
vz : v ≤ z
⊢ eVariationOn f (Icc x z ∩ Icc u v) = ENNReal.ofReal (↑l * (v - u))

Tactic:
rw [Icc_inter_Icc, sup_of_le_right xu, inf_of_le_right vz, ←
        hfs ⟨xu, uz.trans zy⟩ ⟨xv, vz.trans zy⟩, Icc_inter_Icc, sup_of_le_right xu,
        inf_of_le_right (vz.trans zy)]

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

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
s : Set E
φ : E → ℝ
inst✝⁸ : RCLike 𝕜
inst✝⁷ : TopologicalSpace E
inst✝⁶ : AddCommGroup E
inst✝⁵ : Module ℝ E
inst✝⁴ : Module 𝕜 E
inst✝³ : IsScalarTower ℝ 𝕜 E
inst✝² : IsTopologicalAddGroup E
inst✝¹ : ContinuousSMul 𝕜 E
inst✝ : LocallyConvexSpace ℝ E
x : E
a : ℝ
hx : x ∈ s
hax : a < φ x
hsc : IsClosed s
hφc : LowerSemicontinuousOn φ s
hφcv : ConvexOn ℝ s φ
A : Set (E × 𝕜) := {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}
L : StrongDual 𝕜 (E × 𝕜)
b : ℝ
hLb : re (L (x, ↑a)) < b ∧ ∀ b_1 ∈ {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}, b < re (L b_1)
u : E →L[𝕜] 𝕜 := L ∘SL inl 𝕜 E 𝕜
c : ℝ := (re (L (0, 1)))⁻¹
⊢ ∃ l c, s.domRestrict (⇑re ∘ ⇑l) + const (↑s) c ≤ s.domRestrict φ ∧ re (l x) + c = a

Tactic:
refine ⟨- c • u, c * re (u x) + a, fun z => ?_, ?_⟩

Goal state after:
case refine_1
𝕜 : Type u_1
E : Type u_2
s : Set E
φ : E → ℝ
inst✝⁸ : RCLike 𝕜
inst✝⁷ : TopologicalSpace E
inst✝⁶ : AddCommGroup E
inst✝⁵ : Module ℝ E
inst✝⁴ : Module 𝕜 E
inst✝³ : IsScalarTower ℝ 𝕜 E
inst✝² : IsTopologicalAddGroup E
inst✝¹ : ContinuousSMul 𝕜 E
inst✝ : LocallyConvexSpace ℝ E
x : E
a : ℝ
hx : x ∈ s
hax : a < φ x
hsc : IsClosed s
hφc : LowerSemicontinuousOn φ s
hφcv : ConvexOn ℝ s φ
A : Set (E × 𝕜) := {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}
L : StrongDual 𝕜 (E × 𝕜)
b : ℝ
hLb : re (L (x, ↑a)) < b ∧ ∀ b_1 ∈ {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}, b < re (L b_1)
u : E →L[𝕜] 𝕜 := L ∘SL inl 𝕜 E 𝕜
c : ℝ := (re (L (0, 1)))⁻¹
z : ↑s
⊢ (s.domRestrict (⇑re ∘ ⇑(-c • u)) + const (↑s) (c * re (u x) + a)) z ≤ s.domRestrict φ z

case refine_2
𝕜 : Type u_1
E : Type u_2
s : Set E
φ : E → ℝ
inst✝⁸ : RCLike 𝕜
inst✝⁷ : TopologicalSpace E
inst✝⁶ : AddCommGroup E
inst✝⁵ : Module ℝ E
inst✝⁴ : Module 𝕜 E
inst✝³ : IsScalarTower ℝ 𝕜 E
inst✝² : IsTopologicalAddGroup E
inst✝¹ : ContinuousSMul 𝕜 E
inst✝ : LocallyConvexSpace ℝ E
x : E
a : ℝ
hx : x ∈ s
hax : a < φ x
hsc : IsClosed s
hφc : LowerSemicontinuousOn φ s
hφcv : ConvexOn ℝ s φ
A : Set (E × 𝕜) := {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}
L : StrongDual 𝕜 (E × 𝕜)
b : ℝ
hLb : re (L (x, ↑a)) < b ∧ ∀ b_1 ∈ {p | p.1 ∈ s ∧ φ p.1 ≤ re p.2}, b < re (L b_1)
u : E →L[𝕜] 𝕜 := L ∘SL inl 𝕜 E 𝕜
c : ℝ := (re (L (0, 1)))⁻¹
⊢ re ((-c • u) x) + (c * re (u x) + a) = a
Module: Mathlib.Analysis.Convex.Between

Goal state before:
pp: R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : AddCommGroup V
inst✝² : Module R V
inst✝¹ : AddTorsor V P
inst✝ : IsOrderedRing R
x y : P
hne : y ≠ x
h : Wbtw R x y x
⊢ False

Tactic:
rw [wbtw_self_iff] at h

Goal state after:
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : AddCommGroup V
inst✝² : Module R V
inst✝¹ : AddTorsor V P
inst✝ : IsOrderedRing R
x y : P
hne : y ≠ x
h : y = x
⊢ False
Module: Mathlib.Analysis.Convex.Between

Goal state before:
pp: R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : AddCommGroup V
inst✝² : Module R V
inst✝¹ : AddTorsor V P
inst✝ : IsOrderedRing R
x y : P
h : Wbtw R x y x
hne : y ≠ x
⊢ False

Tactic:
rw [wbtw_self_iff] at h

Goal state after:
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : AddCommGroup V
inst✝² : Module R V
inst✝¹ : AddTorsor V P
inst✝ : IsOrderedRing R
x y : P
h : y = x
hne : y ≠ x
⊢ False
Module: Mathlib.Analysis.Convex.Between

Goal state before:
pp: R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁷ : Ring R
inst✝⁶ : PartialOrder R
inst✝⁵ : AddCommGroup V
inst✝⁴ : Module R V
inst✝³ : AddTorsor V P
inst✝² : IsOrderedRing R
inst✝¹ : IsDomain R
inst✝ : IsTorsionFree R V
x y z : P
h : Wbtw R x y z
⊢ Wbtw R y x z ↔ x = y

Tactic:
← wbtw_swap_left_iff R z,

Goal state after:
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁷ : Ring R
inst✝⁶ : PartialOrder R
inst✝⁵ : AddCommGroup V
inst✝⁴ : Module R V
inst✝³ : AddTorsor V P
inst✝² : IsOrderedRing R
inst✝¹ : IsDomain R
inst✝ : IsTorsionFree R V
x y z : P
h : Wbtw R x y z
⊢ Wbtw R y x z ↔ Wbtw R x y z ∧ Wbtw R y x z
Module: Mathlib.CategoryTheory.CofilteredSystem

Goal state before:
pp: J : Type u
inst✝¹ : Category.{v_1, u} J
F : J ⥤ Type v
i j : J
inst✝ : IsCofilteredOrEmpty J
f : j ⟶ i
x : (fun X ↦ X) (F.obj j)
hx : x ∈ F.eventualRange j
⊢ (ConcreteCategory.hom (F.map f)) x ∈ F.eventualRange i

Tactic:
rw [mem_eventualRange_iff] at hx ⊢

Goal state after:
J : Type u
inst✝¹ : Category.{v_1, u} J
F : J ⥤ Type v
i j : J
inst✝ : IsCofilteredOrEmpty J
f : j ⟶ i
x : (fun X ↦ X) (F.obj j)
hx : ∀ ⦃i : J⦄ (f : i ⟶ j), x ∈ range ⇑(ConcreteCategory.hom (F.map f))
⊢ ∀ ⦃i_1 : J⦄ (f_1 : i_1 ⟶ i), (ConcreteCategory.hom (F.map f)) x ∈ range ⇑(ConcreteCategory.hom (F.map f_1))
Module: Mathlib.Data.PEquiv

Goal state before:
pp: α : Type u
β : Type v
γ : Type w
δ : Type x
inst✝² : DecidableEq α
inst✝¹ : DecidableEq β
inst✝ : DecidableEq γ
a : α
b : β
x : α
y : β
⊢ (if y = b then some a else none) = some x ↔ (if x = a then some b else none) = some y

Tactic:
split_ifs with h1 h2
    · simp [*]
    · simp only [some.injEq, iff_false] at *
      exact Ne.symm h2
    · simp only [some.injEq, false_iff] at *
      exact Ne.symm h1
    · simp

Goal state after:
Module: Mathlib.CategoryTheory.CofilteredSystem

Goal state before:
pp: case inl
J : Type u
inst✝¹ : Category.{v_1, u} J
F : J ⥤ Type v
i : J
s : Set (F.obj i)
inst✝ : IsCofilteredOrEmpty J
hFn : ∀ (j : J), Nonempty (F.obj j)
Fsur : ∀ ⦃i j : J⦄ (f : i ⟶ j), Function.Surjective ⇑(ConcreteCategory.hom (F.map f))
hs : s.Nonempty
j : J
h : IsEmpty (j ⟶ i)
⊢ ∃ x, ∀ (i_1 : j ⟶ i), (ConcreteCategory.hom (F.map i_1)) x ∈ s

Tactic:
exact ⟨(hFn j).some, fun ji => h.elim ji⟩

Goal state after:
Module: Mathlib.Data.PEquiv

Goal state before:
pp: α : Type u
β : Type v
γ : Type w
inst✝² : DecidableEq α
inst✝¹ : DecidableEq β
inst✝ : DecidableEq γ
a : α
b : β
c : γ
f : β ≃. γ
h : c ∈ f b
⊢ (single a b).trans f = single a c

Tactic:
ext
  dsimp [single, PEquiv.trans]
  split_ifs <;> simp_all

Goal state after:
Module: Mathlib.Data.PEquiv

Goal state before:
pp: α : Type u
β : Type v
γ : Type w
δ : Type x
inst✝¹ : DecidableEq α
inst✝ : DecidableEq β
f g h : α ≃. β
fg : f ≤ g
gh : f ≤ h
a : α
b : β
H : f a = some b
hf : g a = some b
hg : h a = some b
⊢ (if some b = some b then some b else none) = some b

Tactic:
if_pos rfl

Goal state after:
α : Type u
β : Type v
γ : Type w
δ : Type x
inst✝¹ : DecidableEq α
inst✝ : DecidableEq β
f g h : α ≃. β
fg : f ≤ g
gh : f ≤ h
a : α
b : β
H : f a = some b
hf : g a = some b
hg : h a = some b
⊢ some b = some b
Module: Mathlib.Analysis.Convex.Caratheodory

Goal state before:
pp: case refine_1
𝕜 : Type u_1
E : Type u
inst✝⁵ : Field 𝕜
inst✝⁴ : LinearOrder 𝕜
inst✝³ : IsStrictOrderedRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : DecidableEq E
t : Finset E
f : E → 𝕜
fpos : ∀ y ∈ t, 0 ≤ f y
fsum : ∑ y ∈ t, f y = 1
g : E → 𝕜
gcombo : ∑ e ∈ t, g e • e = 0
gsum : ∑ e ∈ t, g e = 0
gpos : ∃ i ∈ t, 0 < g i
s : Finset E := {z ∈ t | 0 < g z}
i₀ : E
mem : i₀ ∈ s
w : ∀ i ∈ s, f i₀ / g i₀ ≤ f i / g i
hg : 0 < g i₀
hi₀ : i₀ ∈ t
k : E → 𝕜 := fun z ↦ f z - f i₀ / g i₀ * g z
hk : k i₀ = 0
ksum : ∑ e ∈ t.erase i₀, k e = 1
⊢ ∀ y ∈ t.erase ↑⟨i₀, hi₀⟩, 0 ≤ k y

Tactic:
simp only [k, and_imp, sub_nonneg, mem_erase, Ne]

Goal state after:
case refine_1
𝕜 : Type u_1
E : Type u
inst✝⁵ : Field 𝕜
inst✝⁴ : LinearOrder 𝕜
inst✝³ : IsStrictOrderedRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : DecidableEq E
t : Finset E
f : E → 𝕜
fpos : ∀ y ∈ t, 0 ≤ f y
fsum : ∑ y ∈ t, f y = 1
g : E → 𝕜
gcombo : ∑ e ∈ t, g e • e = 0
gsum : ∑ e ∈ t, g e = 0
gpos : ∃ i ∈ t, 0 < g i
s : Finset E := {z ∈ t | 0 < g z}
i₀ : E
mem : i₀ ∈ s
w : ∀ i ∈ s, f i₀ / g i₀ ≤ f i / g i
hg : 0 < g i₀
hi₀ : i₀ ∈ t
k : E → 𝕜 := fun z ↦ f z - f i₀ / g i₀ * g z
hk : k i₀ = 0
ksum : ∑ e ∈ t.erase i₀, k e = 1
⊢ ∀ (y : E), ¬y = i₀ → y ∈ t → f i₀ / g i₀ * g y ≤ f y
Module: Mathlib.Analysis.Convex.Between

Goal state before:
pp: case refine_1.inl
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Field R
inst✝⁴ : LinearOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AddTorsor V P
x z : P
r : R
hr0 : 0 ≤ r
hr1 : r ≤ 1
hr0' : 0 < r
⊢ (lineMap x ((lineMap x z) r)) r⁻¹ = z

Tactic:
simp only [lineMap_apply, smul_smul, vadd_vsub]

Goal state after:
case refine_1.inl
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Field R
inst✝⁴ : LinearOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AddTorsor V P
x z : P
r : R
hr0 : 0 ≤ r
hr1 : r ≤ 1
hr0' : 0 < r
⊢ (r⁻¹ * r) • (z -ᵥ x) +ᵥ x = z
Module: Mathlib.Analysis.Convex.Between

Goal state before:
pp: case refine_2.inr
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Field R
inst✝⁴ : LinearOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AddTorsor V P
x y : P
r : R
hr : 1 ≤ r
⊢ (lineMap x ((lineMap x y) r)) r⁻¹ = y

Tactic:
simp only [lineMap_apply, smul_smul, vadd_vsub]

Goal state after:
case refine_2.inr
R : Type u_1
V : Type u_2
P : Type u_4
inst✝⁵ : Field R
inst✝⁴ : LinearOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AddTorsor V P
x y : P
r : R
hr : 1 ≤ r
⊢ (r⁻¹ * r) • (y -ᵥ x) +ᵥ x = y
Module: Mathlib.Analysis.Convex.Cone.InnerDual

Goal state before:
pp: E : Type u_2
inst✝² : NormedAddCommGroup E
inst✝¹ : InnerProductSpace ℝ E
inst✝ : CompleteSpace E
x : E
s : Set E
⊢ innerDual ({x} ∪ s) = innerDual {x} ⊓ innerDual s

Tactic:
innerDual_union

Goal state after:
E : Type u_2
inst✝² : NormedAddCommGroup E
inst✝¹ : InnerProductSpace ℝ E
inst✝ : CompleteSpace E
x : E
s : Set E
⊢ innerDual {x} ⊓ innerDual s = innerDual {x} ⊓ innerDual s
Module: Mathlib.Geometry.Convex.Cone.Dual

Goal state before:
pp: R : Type u_1
inst✝⁶ : CommSemiring R
inst✝⁵ : PartialOrder R
inst✝⁴ : IsOrderedRing R
M : Type u_2
inst✝³ : AddCommMonoid M
inst✝² : Module R M
N : Type u_3
inst✝¹ : AddCommMonoid N
inst✝ : Module R N
p : M →ₗ[R] N →ₗ[R] R
s : Set M
t : Set N
⊢ s ⊆ ↑(dual p.flip t) ↔ t ⊆ ↑(dual p s)

Tactic:
by
  constructor <;> exact (le_trans subset_dual_dual <| dual_antitone ·)

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

Goal state before:
pp: case refine_1
𝕜 : Type u_1
E : Type u_2
ι : Type u_3
inst✝³ : Semiring 𝕜
inst✝² : PartialOrder 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : ι → E
hc : ConvexIndependent 𝕜 p
i : ι
s : Set ι
h : p i ∈ (convexHull 𝕜) (p '' (s \ {i}))
⊢ False

pp: case refine_2
𝕜 : Type u_1
E : Type u_2
ι : Type u_3
inst✝³ : Semiring 𝕜
inst✝² : PartialOrder 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : ι → E
h : ∀ (i : ι) (s : Set ι), p i ∉ (convexHull 𝕜) (p '' (s \ {i}))
s : Set ι
i : ι
hi : p i ∈ (convexHull 𝕜) (p '' s)
⊢ i ∈ s

Tactic:
· rw [hc.mem_convexHull_iff] at h
    exact h.2 (Set.mem_singleton _)

Goal state after:
case refine_2
𝕜 : Type u_1
E : Type u_2
ι : Type u_3
inst✝³ : Semiring 𝕜
inst✝² : PartialOrder 𝕜
inst✝¹ : AddCommGroup E
inst✝ : Module 𝕜 E
p : ι → E
h : ∀ (i : ι) (s : Set ι), p i ∉ (convexHull 𝕜) (p '' (s \ {i}))
s : Set ι
i : ι
hi : p i ∈ (convexHull 𝕜) (p '' s)
⊢ i ∈ s
Module: Mathlib.Analysis.Convex.Continuous

Goal state before:
pp: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
f : E → ℝ
x₀ : E
ε r M : ℝ
hf : ConvexOn ℝ (ball x₀ r) f
hε : 0 < ε
hM : ∀ (a : E), dist a x₀ < r → |f a| ≤ M
K : ℝ := 2 * M / ε
hK : K = 2 * M / ε
x y : E
hx : x ∈ ball x₀ (r - ε)
hy : y ∈ ball x₀ (r - ε)
hx₀r : ball x₀ (r - ε) ⊆ ball x₀ r
hx' : x ∈ ball x₀ r
hy' : y ∈ ball x₀ r
z : E := x + (ε / ‖x - y‖) • (x - y)
hxy : 0 < ‖x - y‖
hz : z ∈ ball x₀ r
a : ℝ := ε / (ε + ‖x - y‖)
b : ℝ := ‖x - y‖ / (ε + ‖x - y‖)
hab : a + b = 1
⊢ x = a • x + b • x

Tactic:
Convex.combo_self hab

Goal state after:
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
f : E → ℝ
x₀ : E
ε r M : ℝ
hf : ConvexOn ℝ (ball x₀ r) f
hε : 0 < ε
hM : ∀ (a : E), dist a x₀ < r → |f a| ≤ M
K : ℝ := 2 * M / ε
hK : K = 2 * M / ε
x y : E
hx : x ∈ ball x₀ (r - ε)
hy : y ∈ ball x₀ (r - ε)
hx₀r : ball x₀ (r - ε) ⊆ ball x₀ r
hx' : x ∈ ball x₀ r
hy' : y ∈ ball x₀ r
z : E := x + (ε / ‖x - y‖) • (x - y)
hxy : 0 < ‖x - y‖
hz : z ∈ ball x₀ r
a : ℝ := ε / (ε + ‖x - y‖)
b : ℝ := ‖x - y‖ / (ε + ‖x - y‖)
hab : a + b = 1
⊢ x = x
Module: Mathlib.Analysis.Convex.GaugeRescale

Goal state before:
pp: E : Type u_1
inst✝⁵ : AddCommGroup E
inst✝⁴ : Module ℝ E
inst✝³ : TopologicalSpace E
inst✝² : IsTopologicalAddGroup E
inst✝¹ : ContinuousSMul ℝ E
inst✝ : T1Space E
s t : Set E
hsc : Convex ℝ s
hs₀ : s ∈ 𝓝 0
hsb : IsVonNBounded ℝ s
htc : Convex ℝ t
ht₀ : t ∈ 𝓝 0
htb : IsVonNBounded ℝ t
⊢ interior t ⊆ ⇑(gaugeRescaleHomeomorph s t hsc hs₀ hsb htc ht₀ htb) '' interior s

Tactic:
by
    rw [← Homeomorph.preimage_symm, ← image_subset_iff]
    exact (mapsTo_gaugeRescale_interior hs₀ hsc).image_subset

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

Goal state before:
pp: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
C : Set E
f : E → ℝ
hf : ConvexOn ℝ C f
x₀ : E
hC : C ∈ 𝓝 x₀
r : ℝ
this : Filter.Tendsto (fun y ↦ 2 • x₀ - y) (𝓝 x₀) (𝓝 x₀)
hr : ∀ᶠ (a : E) in 𝓝 x₀, f a ≤ r
y : E
hx : 2 • x₀ - y ∈ C
hx' : y ∈ C
hfr : f y ≤ r
hfr' : f (2 • x₀ - y) ≤ r
⊢ f y + f (2 • x₀ - y) ≤ f y + |r|

Tactic:
by gcongr; exact hfr'.trans (le_abs_self _)

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

Goal state before:
pp: E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
C : Set E
f : E → ℝ
hC : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] C
hC' : C.Nonempty
hf : ConvexOn ℝ C f
tfae_1_to_2 : LocallyLipschitzOn C f → ContinuousOn f C
tfae_2_to_3 : ContinuousOn f C → ∃ x₀ ∈ C, ContinuousAt f x₀
tfae_3_to_4 : (∃ x₀ ∈ C, ContinuousAt f x₀) → ∃ x₀ ∈ C, Filter.IsBoundedUnder (fun x1 x2 ↦ x1 ≤ x2) (𝓝 x₀) f
x₀ : E
hx₀ : x₀ ∈ C
r : ℝ
hr : ∀ᶠ (x : ℝ) in Filter.map f (𝓝 x₀), (fun x1 x2 ↦ x1 ≤ x2) x r
x : E
hx : x ∈ C
this : ∀ᶠ (δ : ℝ) in 𝓝 0, (1 - δ)⁻¹ • x - (δ / (1 - δ)) • x₀ ∈ C
δ : ℝ
hδ₀ : 0 < δ
hδ₁ : δ < 1
y : E := (1 - δ)⁻¹ • x - (δ / (1 - δ)) • x₀
hy : y ∈ C
⊢ Filter.IsBoundedUnder (fun x1 x2 ↦ x1 ≤ x2) (𝓝 x) f

Tactic:
refine ⟨max r (f y), ?_⟩

Goal state after:
E : Type u_1
inst✝¹ : NormedAddCommGroup E
inst✝ : NormedSpace ℝ E
C : Set E
f : E → ℝ
hC : IsOpen[PseudoMetricSpace.toUniformSpace.toTopologicalSpace] C
hC' : C.Nonempty
hf : ConvexOn ℝ C f
tfae_1_to_2 : LocallyLipschitzOn C f → ContinuousOn f C
tfae_2_to_3 : ContinuousOn f C → ∃ x₀ ∈ C, ContinuousAt f x₀
tfae_3_to_4 : (∃ x₀ ∈ C, ContinuousAt f x₀) → ∃ x₀ ∈ C, Filter.IsBoundedUnder (fun x1 x2 ↦ x1 ≤ x2) (𝓝 x₀) f
x₀ : E
hx₀ : x₀ ∈ C
r : ℝ
hr : ∀ᶠ (x : ℝ) in Filter.map f (𝓝 x₀), (fun x1 x2 ↦ x1 ≤ x2) x r
x : E
hx : x ∈ C
this : ∀ᶠ (δ : ℝ) in 𝓝 0, (1 - δ)⁻¹ • x - (δ / (1 - δ)) • x₀ ∈ C
δ : ℝ
hδ₀ : 0 < δ
hδ₁ : δ < 1
y : E := (1 - δ)⁻¹ • x - (δ / (1 - δ)) • x₀
hy : y ∈ C
⊢ ∀ᶠ (x : ℝ) in Filter.map f (𝓝 x), (fun x1 x2 ↦ x1 ≤ x2) x (max r (f y))
Module: Mathlib.Geometry.Convex.ConvexSpace.Defs

Goal state before:
pp: R : Type u
inst✝² : PartialOrder R
inst✝¹ : Semiring R
M : Type u_9
inst✝ : Nontrivial R
total : (sum 0 fun x r ↦ r) = 1
⊢ False

Tactic:
simp at total

Goal state after:
Module: Mathlib.Geometry.Convex.ConvexSpace.Defs

Goal state before:
pp: R : Type u
inst✝² : PartialOrder R
inst✝¹ : Semiring R
M : Type u_9
N : Type u_10
P : Type u_11
inst✝ : IsStrictOrderedRing R
f : StdSimplex R M
g₁ : M → N
g₂ : N → P
⊢ map (g₂ ∘ g₁) f = map g₂ (map g₁ f)

Tactic:
by
  ext; simp [mapDomain_comp]

Goal state after:
Module: Mathlib.Geometry.Convex.ConvexSpace.AffineSpace

Goal state before:
pp: R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ (((Finsupp.single x s).sum fun x r ↦ r) + (Finsupp.single y t).sum fun x r ↦ r) = 1

Tactic:
Finsupp.sum_single_index (by simp),

Goal state after:
R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ (s + (Finsupp.single y t).sum fun x r ↦ r) = 1
Module: Mathlib.Geometry.Convex.ConvexSpace.AffineSpace

Goal state before:
pp: R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ (s + (Finsupp.single y t).sum fun x r ↦ r) = 1

Tactic:
Finsupp.sum_single_index (by simp),

Goal state after:
R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ s + t = 1
Module: Mathlib.Geometry.Convex.ConvexSpace.AffineSpace

Goal state before:
pp: case e_a
R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ (((Finsupp.single x s).sum fun p w ↦ w • (p -ᵥ y)) + (Finsupp.single y t).sum fun p w ↦ w • (p -ᵥ y)) = s • (x -ᵥ y)

Tactic:
Finsupp.sum_single_index (by simp),

Goal state after:
case e_a
R : Type u_1
V : Type u_2
P : Type u_3
inst✝⁵ : Ring R
inst✝⁴ : PartialOrder R
inst✝³ : IsStrictOrderedRing R
inst✝² : AddCommGroup V
inst✝¹ : Module R V
inst✝ : AffineSpace V P
s t : R
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
x y : P
⊢ (s • (x -ᵥ y) + (Finsupp.single y t).sum fun p w ↦ w • (p -ᵥ y)) = s • (x -ᵥ y)
Module: Mathlib.Analysis.Convex.Piecewise

Goal state before:
pp: 𝕜 : Type u_1
E : Type u_2
β : Type u_3
inst✝¹¹ : Semiring 𝕜
inst✝¹⁰ : PartialOrder 𝕜
inst✝⁹ : AddCommMonoid E
inst✝⁸ : LinearOrder E
inst✝⁷ : IsOrderedAddMonoid E
inst✝⁶ : Module 𝕜 E
inst✝⁵ : PosSMulMono 𝕜 E
inst✝⁴ : AddCommGroup β
inst✝³ : PartialOrder β
inst✝² : IsOrderedAddMonoid β
inst✝¹ : Module 𝕜 β
inst✝ : PosSMulMono 𝕜 β
e : E
f g : E → β
hf : ConvexOn 𝕜 (Set.Iic e) f
hg : ConvexOn 𝕜 (Set.Ici e) g
h_anti : AntitoneOn f (Set.Iic e)
h_mono : MonotoneOn g (Set.Ici e)
h_eq : f e = g e
⊢ ConvexOn 𝕜 Set.univ ((Set.Iic e).piecewise f g)

Tactic:
refine ⟨convex_univ, fun x _ y _ a b ha hb hab ↦ ?_⟩

Goal state after:
𝕜 : Type u_1
E : Type u_2
β : Type u_3
inst✝¹¹ : Semiring 𝕜
inst✝¹⁰ : PartialOrder 𝕜
inst✝⁹ : AddCommMonoid E
inst✝⁸ : LinearOrder E
inst✝⁷ : IsOrderedAddMonoid E
inst✝⁶ : Module 𝕜 E
inst✝⁵ : PosSMulMono 𝕜 E
inst✝⁴ : AddCommGroup β
inst✝³ : PartialOrder β
inst✝² : IsOrderedAddMonoid β
inst✝¹ : Module 𝕜 β
inst✝ : PosSMulMono 𝕜 β
e : E
f g : E → β
hf : ConvexOn 𝕜 (Set.Iic e) f
hg : ConvexOn 𝕜 (Set.Ici e) g
h_anti : AntitoneOn f (Set.Iic e)
h_mono : MonotoneOn g (Set.Ici e)
h_eq : f e = g e
x : E
x✝¹ : x ∈ Set.univ
y : E
x✝ : y ∈ Set.univ
a b : 𝕜
ha : 0 ≤ a
hb : 0 ≤ b
hab : a + b = 1
⊢ (Set.Iic e).piecewise f g (a • x + b • y) ≤ a • (Set.Iic e).piecewise f g x + b • (Set.Iic e).piecewise f g y
Module: Mathlib.Analysis.Convex.Piecewise

Goal state before:
pp: case inr.inr
𝕜 : Type u_1
E : Type u_2
β : Type u_3
inst✝¹¹ : Semiring 𝕜
inst✝¹⁰ : PartialOrder 𝕜
inst✝⁹ : AddCommMonoid E
inst✝⁸ : LinearOrder E
inst✝⁷ : IsOrderedAddMonoid E
inst✝⁶ : Module 𝕜 E
inst✝⁵ : PosSMulMono 𝕜 E
inst✝⁴ : AddCommGroup β
inst✝³ : PartialOrder β
inst✝² : IsOrderedAddMonoid β
inst✝¹ : Module 𝕜 β
inst✝ : PosSMulMono 𝕜 β
e : E
f g : E → β
hf : ConvexOn 𝕜 (Set.Iic e) f
hg : ConvexOn 𝕜 (Set.Ici e) g
h_anti : AntitoneOn f (Set.Iic e)
h_mono : MonotoneOn g (Set.Ici e)
h_eq : f e = g e
x : E
x✝¹ : x ∈ Set.univ
y : E
x✝ : y ∈ Set.univ
a b : 𝕜
ha : 0 ≤ a
hb : 0 ≤ b
hab : a + b = 1
hx : e < x
hy : e < y
⊢ (Set.Iic e).piecewise f g (a • x + b • y) ≤ a • (Set.Iic e).piecewise f g x + b • (Set.Iic e).piecewise f g y

Tactic:
have hc : e < a • x + b • y :=
        (lt_min hx hy).trans_le (Convex.min_le_combo x y ha hb hab)
    rw [(Set.Iic e).piecewise_eq_of_notMem f g (Set.notMem_Iic.mpr hx),
      (Set.Iic e).piecewise_eq_of_notMem f g (Set.notMem_Iic.mpr hy),
      (Set.Iic e).piecewise_eq_of_notMem f g (Set.notMem_Iic.mpr hc)]
    exact hg.2 hx.le hy.le ha hb hab

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

Goal state before:
pp: X : Type u_2
inst✝² : ConvexSpace ℝ X
inst✝¹ : MetricSpace X
inst✝ : IsConvexDist X
x y : X
s t s' t' : ℝ
hs : 0 ≤ s
ht : 0 ≤ t
h : s + t = 1
hs' : 0 ≤ s'
ht' : 0 ≤ t'
h' : s' + t' = 1
hss' : s' ≤ s
i : Fin 3
⊢ 0 i ≤ (Finsupp.equivFunOnFinite.symm ![s', s - s', t]) i

Tactic:
by fin_cases i <;> simp [*]

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

Goal state before:
pp: 𝕜 : Type u_2
E : Type u_3
inst✝⁵ : Field 𝕜
inst✝⁴ : LinearOrder 𝕜
inst✝³ : IsStrictOrderedRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : FiniteDimensional 𝕜 E
F : Finset (Set E)
h_convex : ∀ X ∈ F, Convex 𝕜 X
h_inter : ∀ G ⊆ F, #G ≤ finrank 𝕜 E + 1 → (⋂₀ ↑G).Nonempty
⊢ ∀ I ⊆ F, #I ≤ finrank 𝕜 E + 1 → (⋂ i ∈ I, i).Nonempty

Tactic:
intro G hG_ss hG_card

Goal state after:
𝕜 : Type u_2
E : Type u_3
inst✝⁵ : Field 𝕜
inst✝⁴ : LinearOrder 𝕜
inst✝³ : IsStrictOrderedRing 𝕜
inst✝² : AddCommGroup E
inst✝¹ : Module 𝕜 E
inst✝ : FiniteDimensional 𝕜 E
F : Finset (Set E)
h_convex : ∀ X ∈ F, Convex 𝕜 X
h_inter : ∀ G ⊆ F, #G ≤ finrank 𝕜 E + 1 → (⋂₀ ↑G).Nonempty
G : Finset (Set E)
hG_ss : G ⊆ F
hG_card : #G ≤ finrank 𝕜 E + 1
⊢ (⋂ i ∈ G, i).Nonempty