mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Basic

Goal state before:
pp: case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : (o.oangle x y).sign = 1
hx : ¬x = 0
hy : ¬y = 0
⊢ ¬o.oangle x y = -↑(InnerProductGeometry.angle x y)

Tactic:
intro hxy

Goal state after:
case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : (o.oangle x y).sign = 1
hx : ¬x = 0
hy : ¬y = 0
hxy : o.oangle x y = -↑(InnerProductGeometry.angle x y)
⊢ False
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Basic

Goal state before:
pp: case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : (o.oangle x y).sign = -1
hx : ¬x = 0
hy : ¬y = 0
⊢ ¬o.oangle x y = ↑(InnerProductGeometry.angle x y)

Tactic:
intro hxy

Goal state after:
case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : (o.oangle x y).sign = -1
hx : ¬x = 0
hy : ¬y = 0
hxy : o.oangle x y = ↑(InnerProductGeometry.angle x y)
⊢ False
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.RightAngle

Goal state before:
pp: V : Type u_1
inst✝¹ : NormedAddCommGroup V
inst✝ : InnerProductSpace ℝ V
hd2 : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : o.oangle x y = ↑(π / 2)
⊢ ‖y‖ / (o.oangle x (x + y)).tan = ‖x‖

Tactic:
by
  have hs : (o.oangle x (x + y)).sign = 1 := by
    rw [oangle_sign_add_right, h, Real.Angle.sign_coe_pi_div_two]
  rw [o.oangle_eq_angle_of_sign_eq_one hs, Real.Angle.tan_coe,
    InnerProductGeometry.norm_div_tan_angle_add_of_inner_eq_zero
      (o.inner_eq_zero_of_oangle_eq_pi_div_two h)
      (Or.inr (o.right_ne_zero_of_oangle_eq_pi_div_two h))]

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.RightAngle

Goal state before:
pp: V : Type u_1
inst✝¹ : NormedAddCommGroup V
inst✝ : InnerProductSpace ℝ V
hd2 : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : o.oangle x y = ↑(π / 2)
⊢ (o.oangle (x - y) x).tan = ‖y‖ / ‖x‖

Tactic:
rw [← neg_inj, oangle_rev, ← oangle_neg_orientation_eq_neg, neg_inj] at h ⊢
  exact (-o).tan_oangle_sub_right_of_oangle_eq_pi_div_two h

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.RightAngle

Goal state before:
pp: V : Type u_1
inst✝¹ : NormedAddCommGroup V
inst✝ : InnerProductSpace ℝ V
hd2 : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
h : o.oangle x y = ↑(π / 2)
hs : (o.oangle y (y - x)).sign = 1
⊢ (o.oangle y (y - x)).cos * ‖y - x‖ = ‖y‖

Tactic:
rw [o.oangle_eq_angle_of_sign_eq_one hs, Real.Angle.cos_coe,
    InnerProductGeometry.cos_angle_sub_mul_norm_of_inner_eq_zero
      (o.inner_rev_eq_zero_of_oangle_eq_pi_div_two h)]

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Basic

Goal state before:
pp: case pos
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
r₁ r₂ r₃ r₄ : ℝ
hr₁ : r₁ = 0
⊢ -(SignType.sign r₂ * (SignType.sign r₃ * (o.oangle x y).sign)) =
    -(SignType.sign r₂ * SignType.sign r₃) * (o.oangle x y).sign

Tactic:
neg_mul,

Goal state after:
case pos
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
r₁ r₂ r₃ r₄ : ℝ
hr₁ : r₁ = 0
⊢ -(SignType.sign r₂ * (SignType.sign r₃ * (o.oangle x y).sign)) =
    -(SignType.sign r₂ * SignType.sign r₃ * (o.oangle x y).sign)
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Basic

Goal state before:
pp: case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
r₁ r₂ r₃ r₄ : ℝ
hr₁ : ¬r₁ = 0
⊢ SignType.sign (r₄ * r₁ + -r₃ * r₂) * (o.oangle x y).sign = SignType.sign (r₁ * r₄ - r₂ * r₃) * (o.oangle x y).sign

Tactic:
neg_mul,

Goal state after:
case neg
V : Type u_1
inst✝² : NormedAddCommGroup V
inst✝¹ : InnerProductSpace ℝ V
inst✝ : Fact (finrank ℝ V = 2)
o : Orientation ℝ V (Fin 2)
x y : V
r₁ r₂ r₃ r₄ : ℝ
hr₁ : ¬r₁ = 0
⊢ SignType.sign (r₄ * r₁ + -(r₃ * r₂)) * (o.oangle x y).sign = SignType.sign (r₁ * r₄ - r₂ * r₃) * (o.oangle x y).sign
Module: Mathlib.Geometry.Euclidean.SignedDist

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
v : V
p q : P
h : ⟪v, p -ᵥ q⟫ = 0
⊢ (signedDist v) p = (signedDist v) q

Tactic:
by
  ext r
  simpa [NormedSpace.normalize, real_inner_smul_left, h] using signedDist_vadd_left v (p -ᵥ q) q r

Goal state after:
Module: Mathlib.Geometry.Euclidean.PerpBisector

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
a b c p : P
h_sbtw : Sbtw ℝ a b c
h_inner : ⟪p -ᵥ a, b -ᵥ a⟫ = 0
t : ℝ
hb_eq : (AffineMap.lineMap a c) t = b
ht0 : 0 < t
ht1 : t < 1
⊢ dist p b < dist p c

Tactic:
have hb : b -ᵥ a = t • (c -ᵥ a) := by simp [← hb_eq, AffineMap.lineMap_apply]

Goal state after:
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
a b c p : P
h_sbtw : Sbtw ℝ a b c
h_inner : ⟪p -ᵥ a, b -ᵥ a⟫ = 0
t : ℝ
hb_eq : (AffineMap.lineMap a c) t = b
ht0 : 0 < t
ht1 : t < 1
hb : b -ᵥ a = t • (c -ᵥ a)
⊢ dist p b < dist p c
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
p₁ p₃ p₄ : P
h₁₂ : p₁ ≠ p₄
ha : ∡ p₁ p₄ p₃ = ∡ p₃ p₄ p₄
hs : line[ℝ, p₁, p₄].SSameSide p₃ p₄
h₃₂ : p₃ ≠ p₄
⊢ False

Tactic:
exact hs.right_notMem (right_mem_affineSpan_pair _ _ _)

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
p₁ p₃ p₄ : P
h₁₂ : p₁ ≠ p₄
ha : ∡ p₁ p₄ p₃ = ∡ p₃ p₄ p₄
hs : line[ℝ, p₁, p₄].SOppSide p₃ p₄
h₃₂ : p₃ ≠ p₄
⊢ False

Tactic:
exact hs.right_notMem (right_mem_affineSpan_pair _ _ _)

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
p₁ p₃ p₄ : P
h₁₂ : p₁ ≠ p₄
ha : ∡ p₁ p₄ p₃ = ∡ p₃ p₄ p₄ + ↑π
hs : line[ℝ, p₁, p₄].SSameSide p₃ p₄
h₃₂ : p₃ ≠ p₄
⊢ False

Tactic:
exact hs.right_notMem (right_mem_affineSpan_pair _ _ _)

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Oriented.Affine

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
p₁ p₃ p₄ : P
h₁₂ : p₁ ≠ p₄
ha : ∡ p₁ p₄ p₃ = ∡ p₃ p₄ p₄ + ↑π
hs : line[ℝ, p₁, p₄].SOppSide p₃ p₄
h₃₂ : p₃ ≠ p₄
⊢ False

Tactic:
exact hs.right_notMem (right_mem_affineSpan_pair _ _ _)

Goal state after:
Module: Mathlib.Geometry.Euclidean.Sphere.OrthRadius

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p q : P
⊢ s.orthRadius p = s.orthRadius q ↔ p = q

Tactic:
refine ⟨fun h ↦ ?_, fun h ↦ h ▸ rfl⟩

Goal state after:
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p q : P
h : s.orthRadius p = s.orthRadius q
⊢ p = q
Module: Mathlib.Geometry.Euclidean.Sphere.Tangent

Goal state before:
pp: case refine_1
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p q : P
as : AffineSubspace ℝ P
h : s.IsTangentAt p as
x✝ : q ∈ s ∧ q ∈ as
hs : q ∈ s
has : q ∈ as
⊢ q = p

pp: case refine_2
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p q : P
as : AffineSubspace ℝ P
h : s.IsTangentAt p as
⊢ q = p → q ∈ s ∧ q ∈ as

Tactic:
· have hd := h.dist_sq_eq_of_mem has
    rw [hs] at hd
    simpa using hd

Goal state after:
case refine_2
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p q : P
as : AffineSubspace ℝ P
h : s.IsTangentAt p as
⊢ q = p → q ∈ s ∧ q ∈ as
Module: Mathlib.Geometry.Euclidean.Sphere.Basic

Goal state before:
pp: case neg.refine_2.inl.refine_2
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : dist p₁ s.center = s.radius
hp₂ : dist p₂ s.center ≤ s.radius
h : ¬p₁ = p₂
hp₂' : dist p₂ s.center < s.radius
⊢ 0 < ‖p₁ -ᵥ s.center‖

Tactic:
· rw [norm_pos_iff, vsub_ne_zero]
        rintro rfl
        rw [← hp₁] at hp₂'
        refine (dist_nonneg.not_gt : ¬dist p₂ s.center < 0) ?_
        simpa using hp₂'

Goal state after:
Module: Mathlib.Geometry.Euclidean.Sphere.Basic

Goal state before:
pp: case pos
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : p₁ ∈ s
hp₂ : dist p₂ s.center < s.radius
h : p₁ = p₂
⊢ 0 < ⟪p₁ -ᵥ p₂, p₁ -ᵥ s.center⟫

pp: case neg
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : p₁ ∈ s
hp₂ : dist p₂ s.center < s.radius
h : ¬p₁ = p₂
⊢ 0 < ⟪p₁ -ᵥ p₂, p₁ -ᵥ s.center⟫

Tactic:
· rw [h, mem_sphere] at hp₁
    exact False.elim (hp₂.ne hp₁)

Goal state after:
case neg
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : p₁ ∈ s
hp₂ : dist p₂ s.center < s.radius
h : ¬p₁ = p₂
⊢ 0 < ⟪p₁ -ᵥ p₂, p₁ -ᵥ s.center⟫
Module: Mathlib.Geometry.Euclidean.Sphere.OrthRadius

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p : P
hpc : p ≠ s.center
hp : dist p s.center ≠ s.radius
hf : Module.finrank ℝ V = 1
⊢ Metric.sphere s.center s.radius ∩ ↑(s.orthRadius p) = ∅

Tactic:
by
  ext p'
  rw [mem_inter_orthRadius_iff_radius_nonneg_and_vsub_mem_and_norm_sq]
  simp only [Set.mem_empty_iff_false, iff_false, not_and]
  intro hr hpo
  have : FiniteDimensional ℝ V := Module.finite_of_finrank_eq_succ hf
  have ha := (ℝ ∙ (p -ᵥ s.center)).finrank_add_finrank_orthogonal
  simp only [finrank_span_singleton (vsub_ne_zero.2 hpc), hf, Nat.add_eq_left,
    Submodule.finrank_eq_zero, Submodule.orthogonal_eq_bot_iff] at ha
  simp only [ha, Submodule.top_orthogonal_eq_bot, Submodule.mem_bot, vsub_eq_zero_iff_eq] at hpo
  simp only [hpo, vsub_self, norm_zero, ne_eq, OfNat.ofNat_ne_zero, not_false_eq_true, zero_pow]
  rw [eq_comm, sub_eq_zero, eq_comm, sq_eq_sq₀ dist_nonneg hr]
  exact hp

Goal state after:
Module: Mathlib.Geometry.Euclidean.Sphere.Tangent

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p : P
h : p ∈ s
⊢ Wbtw ℝ s.center s.center p

Tactic:
by simp

Goal state after:
Module: Mathlib.Geometry.Euclidean.Angle.Incenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
t : Triangle ℝ P
i₁ i₂ i₃ : Fin 3
h₁₂ : i₁ ≠ i₂
h₁₃ : i₁ ≠ i₃
h₂₃ : i₂ ≠ i₃
hd :
  dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₃).points))) (excenter t ∅)) =
    dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₂).points))) (excenter t ∅))
⊢ ∡ (↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₃).points))) (excenter t ∅))) (t.points i₁)
      (incenter t) =
    ∡ (incenter t) (t.points i₁)
      ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₂).points))) (excenter t ∅))

Tactic:
refine oangle_eq_of_dist_orthogonalProjection_eq (mem_affineSpan _ ?_) (mem_affineSpan _ ?_)
    (t.touchpoint_empty_injective.ne h₂₃.symm) hd

Goal state after:
case refine_1
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
t : Triangle ℝ P
i₁ i₂ i₃ : Fin 3
h₁₂ : i₁ ≠ i₂
h₁₃ : i₁ ≠ i₃
h₂₃ : i₂ ≠ i₃
hd :
  dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₃).points))) (excenter t ∅)) =
    dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₂).points))) (excenter t ∅))
⊢ t.points i₁ ∈ Set.range (faceOpposite t i₃).points

case refine_2
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
hd2 : Fact (finrank ℝ V = 2)
inst✝ : Oriented ℝ V (Fin 2)
t : Triangle ℝ P
i₁ i₂ i₃ : Fin 3
h₁₂ : i₁ ≠ i₂
h₁₃ : i₁ ≠ i₃
h₂₃ : i₂ ≠ i₃
hd :
  dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₃).points))) (excenter t ∅)) =
    dist (incenter t) ↑((orthogonalProjection (affineSpan ℝ (Set.range (faceOpposite t i₂).points))) (excenter t ∅))
⊢ t.points i₁ ∈ Set.range (faceOpposite t i₂).points
Module: Mathlib.Geometry.Euclidean.Sphere.Tangent

Goal state before:
pp: case refine_2
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
inst✝ : Nontrivial V
s₁ s₂ : Sphere P
h : dist s₁.center s₂.center = s₂.radius - s₁.radius
h₁ : 0 ≤ s₁.radius
h₂ : 0 ≤ s₂.radius
⊢ s₁.IsIntTangent s₂

Tactic:
by_cases h0 : s₁.center = s₂.center

Goal state after:
case pos
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
inst✝ : Nontrivial V
s₁ s₂ : Sphere P
h : dist s₁.center s₂.center = s₂.radius - s₁.radius
h₁ : 0 ≤ s₁.radius
h₂ : 0 ≤ s₂.radius
h0 : s₁.center = s₂.center
⊢ s₁.IsIntTangent s₂

case neg
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
inst✝ : Nontrivial V
s₁ s₂ : Sphere P
h : dist s₁.center s₂.center = s₂.radius - s₁.radius
h₁ : 0 ≤ s₁.radius
h₂ : 0 ≤ s₂.radius
h0 : ¬s₁.center = s₂.center
⊢ s₁.IsIntTangent s₂
Module: Mathlib.Geometry.Euclidean.Angle.Sphere

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
p₁ p₂ p₃ : P
s : Sphere P
hd : s.IsDiameter p₁ p₃
⊢ ∠ p₁ p₂ p₃ = π / 2 ↔ p₂ ∈ s

Tactic:
mem_sphere',

Goal state after:
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
p₁ p₂ p₃ : P
s : Sphere P
hd : s.IsDiameter p₁ p₃
⊢ ∠ p₁ p₂ p₃ = π / 2 ↔ dist s.center p₂ = s.radius
Module: Mathlib.Geometry.Euclidean.Angle.Sphere

Goal state before:
pp: case mp
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : p₁ ∈ s
hp₂ : p₂ ∈ s
hr : s.radius ≠ 0
h : ∠ p₁ s.center p₂ = 0
⊢ s.radius = ‖p₂ -ᵥ s.center‖

Tactic:
norm_vsub_center_eq_radius hp₂

Goal state after:
case mp
V : Type u_1
P : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace P
inst✝ : NormedAddTorsor V P
s : Sphere P
p₁ p₂ : P
hp₁ : p₁ ∈ s
hp₂ : p₂ ∈ s
hr : s.radius ≠ 0
h : ∠ p₁ s.center p₂ = 0
⊢ s.radius = s.radius
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: case refine_2
V : Type u_1
P : Type u_2
inst✝⁵ : NormedAddCommGroup V
inst✝⁴ : InnerProductSpace ℝ V
inst✝³ : MetricSpace P
inst✝² : NormedAddTorsor V P
n : ℕ
inst✝¹ : NeZero n
s : Simplex ℝ P n
inst✝ : n.AtLeastTwo
i : Fin (n + 1)
⊢ ∀ i_1 ∈ {k | k ≠ i},
    -(⟪s.points i -ᵥ s.altitudeFoot i, s.points i_1 -ᵥ s.altitudeFoot i_1⟫ / (s.height i * s.height i_1)) *
        (s.height i_1)⁻¹ <
      (s.height i_1)⁻¹

Tactic:
rintro j hj

Goal state after:
case refine_2
V : Type u_1
P : Type u_2
inst✝⁵ : NormedAddCommGroup V
inst✝⁴ : InnerProductSpace ℝ V
inst✝³ : MetricSpace P
inst✝² : NormedAddTorsor V P
n : ℕ
inst✝¹ : NeZero n
s : Simplex ℝ P n
inst✝ : n.AtLeastTwo
i j : Fin (n + 1)
hj : j ∈ {k | k ≠ i}
⊢ -(⟪s.points i -ᵥ s.altitudeFoot i, s.points j -ᵥ s.altitudeFoot j⟫ / (s.height i * s.height j)) * (s.height j)⁻¹ <
    (s.height j)⁻¹
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁵ : NormedAddCommGroup V
inst✝⁴ : InnerProductSpace ℝ V
inst✝³ : MetricSpace P
inst✝² : NormedAddTorsor V P
m n : ℕ
inst✝¹ : NeZero m
inst✝ : NeZero n
s : Simplex ℝ P n
e : Fin (n + 1) ≃ Fin (m + 1)
signs : Finset (Fin (m + 1))
⊢ (s.reindex e).excenter signs = s.excenter (Finset.map e.symm.toEmbedding signs)

Tactic:
excenter,

Goal state after:
V : Type u_1
P : Type u_2
inst✝⁵ : NormedAddCommGroup V
inst✝⁴ : InnerProductSpace ℝ V
inst✝³ : MetricSpace P
inst✝² : NormedAddTorsor V P
m n : ℕ
inst✝¹ : NeZero m
inst✝ : NeZero n
s : Simplex ℝ P n
e : Fin (n + 1) ≃ Fin (m + 1)
signs : Finset (Fin (m + 1))
⊢ ((s.reindex e).exsphere signs).center = (s.exsphere (Finset.map e.symm.toEmbedding signs)).center
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
⊢ s.excenter signsᶜ = s.excenter signs

Tactic:
excenter,

Goal state after:
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
⊢ (s.exsphere signsᶜ).center = (s.exsphere signs).center
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
⊢ s.excenter Finset.univ = s.incenter

Tactic:
excenter,

Goal state after:
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
⊢ (s.exsphere Finset.univ).center = s.incenter
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: case mp
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
h : s.ExcenterExists signs
w : Fin (n + 1) → ℝ
hw : ∑ j, w j = 1
⊢ (Finset.affineCombination ℝ Finset.univ s.points) w = s.excenter signs → w = s.excenterWeights signs

Tactic:
excenter,

Goal state after:
case mp
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
h : s.ExcenterExists signs
w : Fin (n + 1) → ℝ
hw : ∑ j, w j = 1
⊢ (Finset.affineCombination ℝ Finset.univ s.points) w = (s.exsphere signs).center → w = s.excenterWeights signs
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: case mpr
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
h : s.ExcenterExists signs
hw : ∑ j, s.excenterWeights signs j = 1
⊢ (Finset.affineCombination ℝ Finset.univ s.points) (s.excenterWeights signs) = s.excenter signs

Tactic:
excenter,

Goal state after:
case mpr
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
h : s.ExcenterExists signs
hw : ∑ j, s.excenterWeights signs j = 1
⊢ (Finset.affineCombination ℝ Finset.univ s.points) (s.excenterWeights signs) = (s.exsphere signs).center
Module: Mathlib.Geometry.Euclidean.Incenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
n : ℕ
inst✝ : NeZero n
s : Simplex ℝ P n
signs : Finset (Fin (n + 1))
h : s.ExcenterExists signs
i : Fin (n + 1)
⊢ #{i} = 0 + 1

Tactic:
by simp

Goal state after:
Module: Mathlib.Geometry.Euclidean.Circumcenter

Goal state before:
pp: V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
ι : Type u_3
hne : Nonempty ι
inst✝ : Finite ι
p : ι → P
ha : AffineIndependent ℝ p
val✝ : Fintype ι
m : ℕ
hn : Fintype.card ι = m + 1 + 1
i : ι
ι2 : Type (max 0 u_3) := { x // x ≠ i }
hc : Fintype.card ι2 = m + 1
this : Nonempty ι2
ha2 : AffineIndependent ℝ fun i2 ↦ p ↑i2
hm :
  ∃! cs,
    cs.center ∈ affineSpan ℝ (Set.range fun i2 ↦ p ↑i2) ∧ (Set.range fun i2 ↦ p ↑i2) ⊆ Metric.sphere cs.center cs.radius
⊢ Set.range p = insert (p i) (p '' {x | x ≠ i})

Tactic:
← Set.image_univ,

Goal state after:
V : Type u_1
P : Type u_2
inst✝⁴ : NormedAddCommGroup V
inst✝³ : InnerProductSpace ℝ V
inst✝² : MetricSpace P
inst✝¹ : NormedAddTorsor V P
ι : Type u_3
hne : Nonempty ι
inst✝ : Finite ι
p : ι → P
ha : AffineIndependent ℝ p
val✝ : Fintype ι
m : ℕ
hn : Fintype.card ι = m + 1 + 1
i : ι
ι2 : Type (max 0 u_3) := { x // x ≠ i }
hc : Fintype.card ι2 = m + 1
this : Nonempty ι2
ha2 : AffineIndependent ℝ fun i2 ↦ p ↑i2
hm :
  ∃! cs,
    cs.center ∈ affineSpan ℝ (Set.range fun i2 ↦ p ↑i2) ∧ (Set.range fun i2 ↦ p ↑i2) ⊆ Metric.sphere cs.center cs.radius
⊢ p '' Set.univ = insert (p i) (p '' {x | x ≠ i})