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Found 103 declarations mentioning Finset.affineCombination.

• Finset.affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (p : ι → P) : (ι → k) →ᵃ[k] P
• Finset.affineCombination_linear 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (p : ι → P) : (Finset.affineCombination k s p).linear = s.weightedVSub p
• Finset.affineCombination_affineCombinationSingleWeights 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) [DecidableEq ι] (p : ι → P) {i : ι} (hi : i ∈ s) : (Finset.affineCombination k s p) (Finset.affineCombinationSingleWeights k i) = p i
• Finset.affineCombination_apply_const 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : P) (h : ∑ i ∈ s, w i = 1) : (Finset.affineCombination k s fun x => p) w = p
• Finset.affineCombination_piSingle 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) [DecidableEq ι] (p : ι → P) {i : ι} (hi : i ∈ s) : (Finset.affineCombination k s p) (Pi.single i 1) = p i
• Finset.affineCombination_of_eq_one_of_eq_zero 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : ι → P) {i : ι} (his : i ∈ s) (hwi : w i = 1) (hw0 : ∀ i2 ∈ s, i2 ≠ i → w i2 = 0) : (Finset.affineCombination k s p) w = p i
• affineCombination_mem_affineSpan 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Nontrivial k] {s : Finset ι} {w : ι → k} (h : ∑ i ∈ s, w i = 1) (p : ι → P) : (Finset.affineCombination k s p) w ∈ affineSpan k (Set.range p)
• affineCombination_mem_affineSpan_of_nonempty 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Nonempty ι] {s : Finset ι} {w : ι → k} (h : ∑ i ∈ s, w i = 1) (p : ι → P) : (Finset.affineCombination k s p) w ∈ affineSpan k (Set.range p)
• eq_affineCombination_of_mem_affineSpan 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {p1 : P} {p : ι → P} (h : p1 ∈ affineSpan k (Set.range p)) : ∃ s w, ∑ i ∈ s, w i = 1 ∧ p1 = (Finset.affineCombination k s p) w
• eq_affineCombination_of_mem_affineSpan_of_fintype 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Fintype ι] {p1 : P} {p : ι → P} (h : p1 ∈ affineSpan k (Set.range p)) : ∃ w, ∑ i, w i = 1 ∧ p1 = (Finset.affineCombination k Finset.univ p) w
• mem_affineSpan_iff_eq_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} (k : Type u_2) (V : Type u_3) {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Nontrivial k] {p1 : P} {p : ι → P} : p1 ∈ affineSpan k (Set.range p) ↔ ∃ s w, ∑ i ∈ s, w i = 1 ∧ p1 = (Finset.affineCombination k s p) w
• eq_affineCombination_of_mem_affineSpan_image 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {p₁ : P} {p : ι → P} {s : Set ι} (h : p₁ ∈ affineSpan k (p '' s)) : ∃ fs w, ↑fs ⊆ s ∧ ∑ i ∈ fs, w i = 1 ∧ p₁ = (Finset.affineCombination k fs p) w
• Finset.affineCombination_affineCombinationLineMapWeights 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) [DecidableEq ι] (p : ι → P) {i j : ι} (hi : i ∈ s) (hj : j ∈ s) (c : k) : (Finset.affineCombination k s p) (Finset.affineCombinationLineMapWeights i j c) = (AffineMap.lineMap (p i) (p j)) c
• Finset.affineCombination_eq_linear_combination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} [Ring k] [AddCommGroup V] [Module k V] {ι : Type u_4} (s : Finset ι) (p : ι → V) (w : ι → k) (hw : ∑ i ∈ s, w i = 1) : (Finset.affineCombination k s p) w = ∑ i ∈ s, w i • p i
• affineCombination_mem_affineSpan_image 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Nontrivial k] {s : Finset ι} {w : ι → k} (h : ∑ i ∈ s, w i = 1) {s' : Set ι} (hs' : ∀ i ∈ s, i ∉ s' → w i = 0) (p : ι → P) : (Finset.affineCombination k s p) w ∈ affineSpan k (p '' s')
• Finset.sum_smul_const_vsub_eq_vsub_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p₂ : ι → P) (p₁ : P) (h : ∑ i ∈ s, w i = 1) : ∑ i ∈ s, w i • (p₁ -ᵥ p₂ i) = p₁ -ᵥ (Finset.affineCombination k s p₂) w
• Finset.sum_smul_vsub_const_eq_affineCombination_vsub 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p₁ : ι → P) (p₂ : P) (h : ∑ i ∈ s, w i = 1) : ∑ i ∈ s, w i • (p₁ i -ᵥ p₂) = (Finset.affineCombination k s p₁) w -ᵥ p₂
• Finset.affineCombination_indicator_subset 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (w : ι → k) (p : ι → P) {s₁ s₂ : Finset ι} (h : s₁ ⊆ s₂) : (Finset.affineCombination k s₁ p) w = (Finset.affineCombination k s₂ p) ((↑s₁).indicator w)
• Finset.affineCombination_map 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} {ι₂ : Type u_5} (s₂ : Finset ι₂) (e : ι₂ ↪ ι) (w : ι → k) (p : ι → P) : (Finset.affineCombination k (Finset.map e s₂) p) w = (Finset.affineCombination k s₂ (p ∘ ⇑e)) (w ∘ ⇑e)
• Finset.affineCombination_congr 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) {w₁ w₂ : ι → k} (hw : ∀ i ∈ s, w₁ i = w₂ i) {p₁ p₂ : ι → P} (hp : ∀ i ∈ s, p₁ i = p₂ i) : (Finset.affineCombination k s p₁) w₁ = (Finset.affineCombination k s p₂) w₂
• Finset.affineCombination_filter_of_ne 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : ι → P) {pred : ι → Prop} [DecidablePred pred] (h : ∀ i ∈ s, w i ≠ 0 → pred i) : (Finset.affineCombination k ({x ∈ s | pred x}) p) w = (Finset.affineCombination k s p) w
• Finset.affineCombination_subtype_eq_filter 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : ι → P) (pred : ι → Prop) [DecidablePred pred] : ((Finset.affineCombination k (Finset.subtype pred s) fun i => p ↑i) fun i => w ↑i) = (Finset.affineCombination k ({x ∈ s | pred x}) p) w
• Finset.affineCombination_apply_eq_lineMap_sum 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) [DecidableEq ι] (w : ι → k) (p : ι → P) (p₁ p₂ : P) (s' : Finset ι) (h : ∑ i ∈ s, w i = 1) (hp₂ : ∀ i ∈ s ∩ s', p i = p₂) (hp₁ : ∀ i ∈ s \ s', p i = p₁) : (Finset.affineCombination k s p) w = (AffineMap.lineMap p₁ p₂) (∑ i ∈ s ∩ s', w i)
• Finset.affineCombination_apply 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : ι → P) : (Finset.affineCombination k s p) w = (s.weightedVSubOfPoint p (Classical.choice ⋯)) w +ᵥ Classical.choice ⋯
• Finset.affineCombination_eq_weightedVSubOfPoint_vadd_of_sum_eq_one 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p : ι → P) (h : ∑ i ∈ s, w i = 1) (b : P) : (Finset.affineCombination k s p) w = (s.weightedVSubOfPoint p b) w +ᵥ b
• Finset.sum_smul_vsub_eq_affineCombination_vsub 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w : ι → k) (p₁ p₂ : ι → P) : ∑ i ∈ s, w i • (p₁ i -ᵥ p₂ i) = (Finset.affineCombination k s p₁) w -ᵥ (Finset.affineCombination k s p₂) w
• Finset.affineCombination_eq_of_weightedVSub_eq_zero_of_eq_neg_one 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) {w : ι → k} {p : ι → P} (hw : (s.weightedVSub p) w = 0) {i : ι} [DecidablePred fun x => x ≠ i] (his : i ∈ s) (hwi : w i = -1) : (Finset.affineCombination k ({x ∈ s | x ≠ i}) p) w = p i
• Finset.map_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) {V₂ : Type u_6} {P₂ : Type u_7} [AddCommGroup V₂] [Module k V₂] [AddTorsor V₂ P₂] (p : ι → P) (w : ι → k) (hw : s.sum w = 1) (f : P →ᵃ[k] P₂) : f ((Finset.affineCombination k s p) w) = (Finset.affineCombination k s (⇑f ∘ p)) w
• Finset.eq_affineCombination_subset_iff_eq_affineCombination_subtype 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  (k : Type u_1) (V : Type u_2) {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} {p0 : P} {s : Set ι} {p : ι → P} : (∃ fs, ↑fs ⊆ s ∧ ∃ w, ∑ i ∈ fs, w i = 1 ∧ p0 = (Finset.affineCombination k fs p) w) ↔ ∃ fs w, ∑ i ∈ fs, w i = 1 ∧ p0 = (Finset.affineCombination k fs fun i => p ↑i) w
• Finset.affineCombination_vsub 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w₁ w₂ : ι → k) (p : ι → P) : (Finset.affineCombination k s p) w₁ -ᵥ (Finset.affineCombination k s p) w₂ = (s.weightedVSub p) (w₁ - w₂)
• Finset.affineCombination_sdiff_sub 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) [DecidableEq ι] {s₂ : Finset ι} (h : s₂ ⊆ s) (w : ι → k) (p : ι → P) : (Finset.affineCombination k (s \ s₂) p) w -ᵥ (Finset.affineCombination k s₂ p) (-w) = (s.weightedVSub p) w
• Finset.weightedVSub_vadd_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w₁ w₂ : ι → k) (p : ι → P) : (s.weightedVSub p) w₁ +ᵥ (Finset.affineCombination k s p) w₂ = (Finset.affineCombination k s p) (w₁ + w₂)
• Finset.attach_affineCombination_coe 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] (s : Finset P) (w : P → k) : (Finset.affineCombination k s.attach Subtype.val) (w ∘ Subtype.val) = (Finset.affineCombination k s id) w
• Finset.lineMap_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] {ι : Type u_4} (s : Finset ι) (w₁ w₂ : ι → k) (r : k) (p : ι → P) : (AffineMap.lineMap ((Finset.affineCombination k s p) w₁) ((Finset.affineCombination k s p) w₂)) r = (Finset.affineCombination k s p) ((AffineMap.lineMap w₁ w₂) r)
• Finset.attach_affineCombination_of_injective 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [S : AddTorsor V P] [DecidableEq P] (s : Finset P) (w : P → k) (f : ↥s → P) (hf : Function.Injective f) : (Finset.affineCombination k s.attach f) (w ∘ f) = (Finset.affineCombination k (Finset.image f Finset.univ) id) w
• Finset.homothety_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Combination
  {k : Type u_6} {V : Type u_7} {P : Type u_8} [CommRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_9} [DecidableEq ι] (s : Finset ι) (p : ι → P) (w : ι → k) {i : ι} (hi : i ∈ s) (r : k) : (AffineMap.homothety (p i) r) ((Finset.affineCombination k s p) w) = (Finset.affineCombination k s p) ((AffineMap.lineMap (Pi.single i 1) w) r)
• Finset.centroid_def 📋 Mathlib.LinearAlgebra.AffineSpace.Centroid
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [DivisionRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} (s : Finset ι) (p : ι → P) : Finset.centroid k s p = (Finset.affineCombination k s p) (Finset.centroidWeights k s)
• Finset.centroid_eq_affineCombination_fintype 📋 Mathlib.LinearAlgebra.AffineSpace.Centroid
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [DivisionRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} (s : Finset ι) [Fintype ι] (p : ι → P) : Finset.centroid k s p = (Finset.affineCombination k Finset.univ p) (Finset.centroidWeightsIndicator k s)
• AffineIndependent.eq_zero_of_affineCombination_mem_affineSpan 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (ha : AffineIndependent k p) {fs : Finset ι} {w : ι → k} (hw : ∑ i ∈ fs, w i = 1) {s : Set ι} (hm : (Finset.affineCombination k fs p) w ∈ affineSpan k (p '' s)) {i : ι} (hifs : i ∈ fs) (his : i ∉ s) : w i = 0
• affineIndependent_iff_eq_of_fintype_affineCombination_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} [Fintype ι] (p : ι → P) : AffineIndependent k p ↔ ∀ (w1 w2 : ι → k), ∑ i, w1 i = 1 → ∑ i, w2 i = 1 → (Finset.affineCombination k Finset.univ p) w1 = (Finset.affineCombination k Finset.univ p) w2 → w1 = w2
• AffineIndependent.affineCombination_eq_iff_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (ha : AffineIndependent k p) {w₁ w₂ : ι → k} {s : Finset ι} (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1) : (Finset.affineCombination k s p) w₁ = (Finset.affineCombination k s p) w₂ ↔ ∀ i ∈ s, w₁ i = w₂ i
• AffineIndependent.indicator_eq_of_affineCombination_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (ha : AffineIndependent k p) (s₁ s₂ : Finset ι) (w₁ w₂ : ι → k) (hw₁ : ∑ i ∈ s₁, w₁ i = 1) (hw₂ : ∑ i ∈ s₂, w₂ i = 1) (h : (Finset.affineCombination k s₁ p) w₁ = (Finset.affineCombination k s₂ p) w₂) : (↑s₁).indicator w₁ = (↑s₂).indicator w₂
• affineIndependent_iff_indicator_eq_of_affineCombination_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  (k : Type u_1) {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} (p : ι → P) : AffineIndependent k p ↔ ∀ (s1 s2 : Finset ι) (w1 w2 : ι → k), ∑ i ∈ s1, w1 i = 1 → ∑ i ∈ s2, w2 i = 1 → (Finset.affineCombination k s1 p) w1 = (Finset.affineCombination k s2 p) w2 → (↑s1).indicator w1 = (↑s2).indicator w2
• AffineIndependent.indicator_extend_eq_of_affineCombination_comp_embedding_eq_of_fintype 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} [Fintype ι] {ι₂ : Type u_5} [Fintype ι₂] {p : ι → P} (ha : AffineIndependent k p) {w₁ : ι → k} {w₂ : ι₂ → k} (hw₁ : ∑ i, w₁ i = 1) (hw₂ : ∑ i, w₂ i = 1) (e : ι₂ ↪ ι) (h : (Finset.affineCombination k Finset.univ (p ∘ ⇑e)) w₂ = (Finset.affineCombination k Finset.univ p) w₁) : (Set.range ⇑e).indicator (Function.extend (⇑e) w₂ 0) = w₁
• AffineIndependent.indicator_extend_eq_of_affineCombination_comp_embedding_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {ι₂ : Type u_5} {p : ι → P} (ha : AffineIndependent k p) {s₁ : Finset ι} {s₂ : Finset ι₂} {w₁ : ι → k} {w₂ : ι₂ → k} (hw₁ : ∑ i ∈ s₁, w₁ i = 1) (hw₂ : ∑ i ∈ s₂, w₂ i = 1) (e : ι₂ ↪ ι) (h : (Finset.affineCombination k s₂ (p ∘ ⇑e)) w₂ = (Finset.affineCombination k s₁ p) w₁) : (↑(Finset.map e s₂)).indicator (Function.extend (⇑e) w₂ 0) = (↑s₁).indicator w₁
• affineCombination_mem_affineSpan_pair 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (h : AffineIndependent k p) {w w₁ w₂ : ι → k} {s : Finset ι} : ∑ i ∈ s, w i = 1 → ∀ (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1), (Finset.affineCombination k s p) w ∈ line[k, (Finset.affineCombination k s p) w₁, (Finset.affineCombination k s p) w₂] ↔ ∃ r, ∀ i ∈ s, w i = r * (w₂ i - w₁ i) + w₁ i
• weightedVSub_mem_vectorSpan_pair 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (h : AffineIndependent k p) {w w₁ w₂ : ι → k} {s : Finset ι} (hw : ∑ i ∈ s, w i = 0) (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1) : (s.weightedVSub p) w ∈ vectorSpan k {(Finset.affineCombination k s p) w₁, (Finset.affineCombination k s p) w₂} ↔ ∃ r, ∀ i ∈ s, w i = r * (w₁ i - w₂ i)
• sign_eq_of_affineCombination_mem_affineSpan_single_lineMap 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [LinearOrder k] [IsStrictOrderedRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (h : AffineIndependent k p) {w : ι → k} {s : Finset ι} (hw : ∑ i ∈ s, w i = 1) {i₁ i₂ i₃ : ι} (h₁ : i₁ ∈ s) (h₂ : i₂ ∈ s) (h₃ : i₃ ∈ s) (h₁₂ : i₁ ≠ i₂) (h₁₃ : i₁ ≠ i₃) (h₂₃ : i₂ ≠ i₃) {c : k} (hc0 : 0 < c) (hc1 : c < 1) (hs : (Finset.affineCombination k s p) w ∈ line[k, p i₁, (AffineMap.lineMap (p i₂) (p i₃)) c]) : SignType.sign (w i₂) = SignType.sign (w i₃)
• AffineIndependent.affineCombination_eq_lineMap_iff_weight_lineMap 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (ha : AffineIndependent k p) {w w₁ w₂ : ι → k} {s : Finset ι} (hw : ∑ i ∈ s, w i = 1) (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1) (c : k) : (Finset.affineCombination k s p) w = (AffineMap.lineMap ((Finset.affineCombination k s p) w₁) ((Finset.affineCombination k s p) w₂)) c ↔ ∀ i ∈ s, w i = (AffineMap.lineMap (w₁ i) (w₂ i)) c
• sign_eq_of_affineCombination_mem_affineSpan_pair 📋 Mathlib.LinearAlgebra.AffineSpace.Independent
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [LinearOrder k] [IsStrictOrderedRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {ι : Type u_4} {p : ι → P} (h : AffineIndependent k p) {w w₁ w₂ : ι → k} {s : Finset ι} (hw : ∑ i ∈ s, w i = 1) (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1) (hs : (Finset.affineCombination k s p) w ∈ line[k, (Finset.affineCombination k s p) w₁, (Finset.affineCombination k s p) w₂]) {i j : ι} (hi : i ∈ s) (hj : j ∈ s) (hi0 : w₁ i = 0) (hj0 : w₁ j = 0) (hij : SignType.sign (w₂ i) = SignType.sign (w₂ j)) : SignType.sign (w i) = SignType.sign (w j)
• AffineIndependent.injOn_affineCombination_fintypeAffineCoords 📋 Mathlib.LinearAlgebra.AffineSpace.Basis
  {ι : Type u_1} {k : Type u_2} {V : Type u_3} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Fintype ι] {p : ι → P} (h : AffineIndependent k p) : Set.InjOn ⇑(Finset.affineCombination k Finset.univ p) ↑(fintypeAffineCoords ι k)
• AffineBasis.affineCombination_coord_eq_self 📋 Mathlib.LinearAlgebra.AffineSpace.Basis
  {ι : Type u_1} {k : Type u_5} {V : Type u_6} {P : Type u_7} [AddCommGroup V] [AddTorsor V P] [Ring k] [Module k V] (b : AffineBasis ι k P) [Fintype ι] (q : P) : ((Finset.affineCombination k Finset.univ ⇑b) fun i => (b.coord i) q) = q
• AffineBasis.coord_apply_combination_of_mem 📋 Mathlib.LinearAlgebra.AffineSpace.Basis
  {ι : Type u_1} {k : Type u_5} {V : Type u_6} {P : Type u_7} [AddCommGroup V] [AddTorsor V P] [Ring k] [Module k V] (b : AffineBasis ι k P) {s : Finset ι} {i : ι} (hi : i ∈ s) {w : ι → k} (hw : s.sum w = 1) : (b.coord i) ((Finset.affineCombination k s ⇑b) w) = w i
• AffineBasis.coord_apply_combination_of_notMem 📋 Mathlib.LinearAlgebra.AffineSpace.Basis
  {ι : Type u_1} {k : Type u_5} {V : Type u_6} {P : Type u_7} [AddCommGroup V] [AddTorsor V P] [Ring k] [Module k V] (b : AffineBasis ι k P) {s : Finset ι} {i : ι} (hi : i ∉ s) {w : ι → k} (hw : s.sum w = 1) : (b.coord i) ((Finset.affineCombination k s ⇑b) w) = 0
• Affine.Simplex.affineCombination_mem_setInterior_iff 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {I : Set k} {n : ℕ} {s : Affine.Simplex k P n} {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ Affine.Simplex.setInterior I s ↔ ∀ (i : Fin (n + 1)), w i ∈ I
• Affine.Simplex.affineCombination_mem_closedInterior_iff 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] {n : ℕ} {s : Affine.Simplex k P n} {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ s.closedInterior ↔ ∀ (i : Fin (n + 1)), w i ∈ Set.Icc 0 1
• Affine.Simplex.affineCombination_mem_interior_iff 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] {n : ℕ} {s : Affine.Simplex k P n} {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ s.interior ↔ ∀ (i : Fin (n + 1)), w i ∈ Set.Ioo 0 1
• Affine.Simplex.affineCombination_mem_affineSpan_faceOpposite_iff 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_5} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {n : ℕ} [NeZero n] {s : Affine.Simplex k P n} {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) {i : Fin (n + 1)} : (Finset.affineCombination k Finset.univ s.points) w ∈ affineSpan k (Set.range (s.faceOpposite i).points) ↔ w i = 0
• Affine.Simplex.affineCombination_mem_setInterior_face_iff_mem 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] (I : Set k) {n : ℕ} (s : Affine.Simplex k P n) {fs : Finset (Fin (n + 1))} {m : ℕ} (h : fs.card = m + 1) {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ Affine.Simplex.setInterior I (s.face h) ↔ (∀ i ∈ fs, w i ∈ I) ∧ ∀ i ∉ fs, w i = 0
• Affine.Simplex.affineCombination_mem_closedInterior_face_iff_nonneg 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] [IsOrderedAddMonoid k] {n : ℕ} (s : Affine.Simplex k P n) {fs : Finset (Fin (n + 1))} {m : ℕ} (h : fs.card = m + 1) {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ (s.face h).closedInterior ↔ (∀ i ∈ fs, 0 ≤ w i) ∧ ∀ i ∉ fs, w i = 0
• Affine.Simplex.affineCombination_mem_closedInterior_face_iff_mem_Icc 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] {n : ℕ} (s : Affine.Simplex k P n) {fs : Finset (Fin (n + 1))} {m : ℕ} (h : fs.card = m + 1) {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ (s.face h).closedInterior ↔ (∀ i ∈ fs, w i ∈ Set.Icc 0 1) ∧ ∀ i ∉ fs, w i = 0
• Affine.Simplex.affineCombination_mem_interior_face_iff_mem_Ioo 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] {n : ℕ} (s : Affine.Simplex k P n) {fs : Finset (Fin (n + 1))} {m : ℕ} (h : fs.card = m + 1) {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ (s.face h).interior ↔ (∀ i ∈ fs, w i ∈ Set.Ioo 0 1) ∧ ∀ i ∉ fs, w i = 0
• Affine.Simplex.affineCombination_mem_interior_face_iff_pos 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Basic
  {k : Type u_1} {V : Type u_2} {P : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [PartialOrder k] [IsOrderedAddMonoid k] {n : ℕ} (s : Affine.Simplex k P n) {fs : Finset (Fin (n + 1))} {m : ℕ} [NeZero m] (h : fs.card = m + 1) {w : Fin (n + 1) → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ s.points) w ∈ (s.face h).interior ↔ (∀ i ∈ fs, 0 < w i) ∧ ∀ i ∉ fs, w i = 0
• affineCombination_eq_centerMass 📋 Mathlib.Analysis.Convex.Combination
  {R : Type u_1} {E : Type u_3} [Field R] [AddCommGroup E] [Module R E] {ι : Type u_8} {t : Finset ι} {p : ι → E} {w : ι → R} (hw₂ : ∑ i ∈ t, w i = 1) : (Finset.affineCombination R t p) w = t.centerMass w p
• affineCombination_mem_convexHull 📋 Mathlib.Analysis.Convex.Combination
  {R : Type u_1} {E : Type u_3} {ι : Type u_5} [Field R] [AddCommGroup E] [Module R E] [LinearOrder R] [IsStrictOrderedRing R] {s : Finset ι} {v : ι → E} {w : ι → R} (hw₀ : ∀ i ∈ s, 0 ≤ w i) (hw₁ : s.sum w = 1) : (Finset.affineCombination R s v) w ∈ (convexHull R) (Set.range v)
• convexHull_range_eq_exists_affineCombination 📋 Mathlib.Analysis.Convex.Combination
  {R : Type u_1} {E : Type u_3} {ι : Type u_5} [Field R] [AddCommGroup E] [Module R E] [LinearOrder R] [IsStrictOrderedRing R] (v : ι → E) : (convexHull R) (Set.range v) = {x | ∃ s w, (∀ i ∈ s, 0 ≤ w i) ∧ s.sum w = 1 ∧ (Finset.affineCombination R s v) w = x}
• Affine.Simplex.centroid_eq_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Centroid
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [DivisionRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {n : ℕ} (s : Affine.Simplex k P n) : s.centroid = (Finset.affineCombination k Finset.univ s.points) (Finset.centroidWeights k Finset.univ)
• Affine.Simplex.faceOppositeCentroid_eq_affineCombination 📋 Mathlib.LinearAlgebra.AffineSpace.Simplex.Centroid
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [DivisionRing k] [AddCommGroup V] [Module k V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex k P n) (i : Fin (n + 1)) : s.faceOppositeCentroid i = (Finset.affineCombination k {i}ᶜ s.points) fun x => (↑n)⁻¹
• Sbtw.affineCombination_of_mem_affineSpan_pair 📋 Mathlib.Analysis.Convex.Between
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Ring R] [PartialOrder R] [AddCommGroup V] [Module R V] [AddTorsor V P] [IsOrderedRing R] [IsDomain R] [Module.IsTorsionFree R V] {ι : Type u_6} {p : ι → P} (ha : AffineIndependent R p) {w w₁ w₂ : ι → R} {s : Finset ι} (hw : ∑ i ∈ s, w i = 1) (hw₁ : ∑ i ∈ s, w₁ i = 1) (hw₂ : ∑ i ∈ s, w₂ i = 1) (h : (Finset.affineCombination R s p) w ∈ line[R, (Finset.affineCombination R s p) w₁, (Finset.affineCombination R s p) w₂]) {i : ι} (his : i ∈ s) (hs : Sbtw R (w₁ i) (w i) (w₂ i)) : Sbtw R ((Finset.affineCombination R s p) w₁) ((Finset.affineCombination R s p) w) ((Finset.affineCombination R s p) w₂)
• AddTorsor.convexCombination_eq_affineCombination 📋 Mathlib.Geometry.Convex.ConvexSpace.AffineSpace
  {R : Type u_1} {V : Type u_2} {P : Type u_3} [Ring R] [PartialOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] [Convexity.ConvexSpace R P] [Convexity.IsAffineConvexSpace R V P] (s : Convexity.StdSimplex R P) : Convexity.sConvexComb s = (Finset.affineCombination R s.weights.support id) ⇑s.weights
• AddTorsor.sConvexComb_eq_affineCombination 📋 Mathlib.Geometry.Convex.ConvexSpace.AffineSpace
  {R : Type u_1} {V : Type u_2} {P : Type u_3} [Ring R] [PartialOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] [Convexity.ConvexSpace R P] [Convexity.IsAffineConvexSpace R V P] (s : Convexity.StdSimplex R P) : Convexity.sConvexComb s = (Finset.affineCombination R s.weights.support id) ⇑s.weights
• AddTorsor.iConvexComb_eq_affineCombination 📋 Mathlib.Geometry.Convex.ConvexSpace.AffineSpace
  {R : Type u_1} {V : Type u_2} {P : Type u_3} {I : Type u_4} [Ring R] [PartialOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] [Convexity.ConvexSpace R P] [Convexity.IsAffineConvexSpace R V P] (s : Convexity.StdSimplex R I) (f : I → P) : Convexity.iConvexComb s f = (Finset.affineCombination R s.weights.support f) ⇑s.weights
• Affine.Simplex.sOppSide_affineSpan_faceOpposite_point_left_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SOppSide (s.points i) ((Finset.affineCombination R Finset.univ s.points) w) ↔ w i < 0
• Affine.Simplex.sOppSide_affineSpan_faceOpposite_point_right_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SOppSide ((Finset.affineCombination R Finset.univ s.points) w) (s.points i) ↔ w i < 0
• Affine.Simplex.sSameSide_affineSpan_faceOpposite_point_left_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SSameSide (s.points i) ((Finset.affineCombination R Finset.univ s.points) w) ↔ 0 < w i
• Affine.Simplex.sSameSide_affineSpan_faceOpposite_point_right_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SSameSide ((Finset.affineCombination R Finset.univ s.points) w) (s.points i) ↔ 0 < w i
• Affine.Simplex.wOppSide_affineSpan_faceOpposite_point_left_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WOppSide (s.points i) ((Finset.affineCombination R Finset.univ s.points) w) ↔ w i ≤ 0
• Affine.Simplex.wOppSide_affineSpan_faceOpposite_point_right_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WOppSide ((Finset.affineCombination R Finset.univ s.points) w) (s.points i) ↔ w i ≤ 0
• Affine.Simplex.wSameSide_affineSpan_faceOpposite_point_left_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WSameSide (s.points i) ((Finset.affineCombination R Finset.univ s.points) w) ↔ 0 ≤ w i
• Affine.Simplex.wSameSide_affineSpan_faceOpposite_point_right_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w : Fin (n + 1) → R} (hw : ∑ j, w j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WSameSide ((Finset.affineCombination R Finset.univ s.points) w) (s.points i) ↔ 0 ≤ w i
• Affine.Simplex.sOppSide_affineSpan_faceOpposite_of_pos_of_neg 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} (hs₁ : 0 < w₁ i) (hs₂ : w₂ i < 0) : (affineSpan R (Set.range (s.faceOpposite i).points)).SOppSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂)
• Affine.Simplex.sSameSide_affineSpan_faceOpposite_of_sign_eq 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} (hs : SignType.sign (w₁ i) = SignType.sign (w₂ i)) (h0 : w₁ i ≠ 0) : (affineSpan R (Set.range (s.faceOpposite i).points)).SSameSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂)
• Affine.Simplex.sSameSide_affineSpan_faceOpposite_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SSameSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂) ↔ SignType.sign (w₁ i) = SignType.sign (w₂ i) ∧ w₁ i ≠ 0
• Affine.Simplex.sOppSide_affineSpan_faceOpposite_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).SOppSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂) ↔ SignType.sign (w₁ i) = -SignType.sign (w₂ i) ∧ w₁ i ≠ 0
• Affine.Simplex.wSameSide_affineSpan_faceOpposite_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WSameSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂) ↔ SignType.sign (w₁ i) = SignType.sign (w₂ i) ∨ w₁ i = 0 ∨ w₂ i = 0
• Affine.Simplex.wOppSide_affineSpan_faceOpposite_iff 📋 Mathlib.Analysis.Convex.Side
  {R : Type u_1} {V : Type u_2} {P : Type u_4} [Field R] [LinearOrder R] [IsStrictOrderedRing R] [AddCommGroup V] [Module R V] [AddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex R P n) {w₁ w₂ : Fin (n + 1) → R} (hw₁ : ∑ j, w₁ j = 1) (hw₂ : ∑ j, w₂ j = 1) {i : Fin (n + 1)} : (affineSpan R (Set.range (s.faceOpposite i).points)).WOppSide ((Finset.affineCombination R Finset.univ s.points) w₁) ((Finset.affineCombination R Finset.univ s.points) w₂) ↔ SignType.sign (w₁ i) = -SignType.sign (w₂ i) ∨ w₁ i = 0 ∨ w₂ i = 0
• dist_affineCombination_lt_of_strictConvexSpace 📋 Mathlib.Analysis.Convex.StrictCombination
  {V : Type u_2} {P : Type u_3} {ι : Type u_4} [NormedAddCommGroup V] [NormedSpace ℝ V] [StrictConvexSpace ℝ V] [PseudoMetricSpace P] [NormedAddTorsor V P] {t : Finset ι} {w : ι → ℝ} {p₀ : P} {r : ℝ} {p : ι → P} (h0 : ∀ i ∈ t, 0 ≤ w i) (h1 : ∑ i ∈ t, w i = 1) {i j : ι} (hi : i ∈ t) (hj : j ∈ t) (hij : p i ≠ p j) (hi0 : w i ≠ 0) (hj0 : w j ≠ 0) (hp : ∀ i ∈ t, dist (p i) p₀ ≤ r) : dist ((Finset.affineCombination ℝ t p) w) p₀ < r
• AffineIndependent.exists_affineCombination_eq_smul_eq_of_fintype 📋 Mathlib.LinearAlgebra.AffineSpace.Ceva
  {k : Type u_1} {V : Type u_2} {P : Type u_3} {ι : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] [Fintype ι] {p : ι → P} (hp : AffineIndependent k p) {s : Set ι} (hs : s.Nonempty) {w : ↑s → ι → k} (hw : ∀ (i : ↑s), ∑ j, w i j = 1) {p' : P} (hp' : ∀ (i : ↑s), p' ∈ line[k, p ↑i, (Finset.affineCombination k Finset.univ p) (w i)]) : ∃ w', ∑ j, w' j = 1 ∧ (Finset.affineCombination k Finset.univ p) w' = p' ∧ ∀ (i : ↑s), ∃ r, ∀ (j : ι), r * {↑i}ᶜ.indicator (w i) j = {↑i}ᶜ.indicator w' j
• AffineIndependent.exists_affineCombination_eq_smul_eq 📋 Mathlib.LinearAlgebra.AffineSpace.Ceva
  {k : Type u_1} {V : Type u_2} {P : Type u_3} {ι : Type u_4} [Ring k] [AddCommGroup V] [Module k V] [AddTorsor V P] {p : ι → P} (hp : AffineIndependent k p) {s : Set ι} (hs : s.Nonempty) {fs : ↑s → Finset ι} {w : ↑s → ι → k} (hw : ∀ (i : ↑s), ∑ j ∈ fs i, w i j = 1) {p' : P} (hp' : ∀ (i : ↑s), p' ∈ line[k, p ↑i, (Finset.affineCombination k (fs i) p) (w i)]) : ∃ w' fs', ∑ j ∈ fs', w' j = 1 ∧ (Finset.affineCombination k fs' p) w' = p' ∧ ∀ (i : ↑s), ∃ r, ∀ (j : ι), r * (↑(fs i) \ {↑i}).indicator (w i) j = (↑fs' \ {↑i}).indicator w' j
• AffineSubspace.affineCombination_mem_shift 📋 Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Shift
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [AddTorsor V P] [Module k V] {ι : Type u_4} [Fintype ι] [Nontrivial ι] (p : ι → P) (i : ι) {w : ι → k} (hw : ∑ i, w i = 1) : (Finset.affineCombination k Finset.univ p) w ∈ (affineSpan k (p '' {i}ᶜ)).shift (p i) (1 - w i)
• AffineIndependent.affineCombination_mem_shift_iff 📋 Mathlib.LinearAlgebra.AffineSpace.AffineSubspace.Shift
  {k : Type u_1} {V : Type u_2} {P : Type u_3} [Ring k] [AddCommGroup V] [AddTorsor V P] [Module k V] {ι : Type u_4} [Fintype ι] [Nontrivial ι] {p : ι → P} (h : AffineIndependent k p) (i : ι) {w : ι → k} (hw : ∑ i, w i = 1) (c : k) : (Finset.affineCombination k Finset.univ p) w ∈ (affineSpan k (p '' {i}ᶜ)).shift (p i) c ↔ w i = 1 - c
• Affine.Simplex.signedInfDist_affineCombination 📋 Mathlib.Geometry.Euclidean.SignedDist
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex ℝ P n) (i : Fin (n + 1)) {w : Fin (n + 1) → ℝ} (h : ∑ i, w i = 1) : (s.signedInfDist i) ((Finset.affineCombination ℝ Finset.univ s.points) w) = w i * ‖s.points i -ᵥ ↑((s.faceOpposite i).orthogonalProjectionSpan (s.points i))‖
• EuclideanGeometry.dist_affineCombination 📋 Mathlib.Geometry.Euclidean.Basic
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {ι : Type u_3} {s : Finset ι} {w₁ w₂ : ι → ℝ} (p : ι → P) (h₁ : ∑ i ∈ s, w₁ i = 1) (h₂ : ∑ i ∈ s, w₂ i = 1) : have a₁ := (Finset.affineCombination ℝ s p) w₁; have a₂ := (Finset.affineCombination ℝ s p) w₂; dist a₁ a₂ * dist a₁ a₂ = (-∑ i₁ ∈ s, ∑ i₂ ∈ s, (w₁ - w₂) i₁ * (w₁ - w₂) i₂ * (dist (p i₁) (p i₂) * dist (p i₁) (p i₂))) / 2
• Affine.Simplex.excenter_eq_affineCombination 📋 Mathlib.Geometry.Euclidean.Incenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex ℝ P n) (signs : Finset (Fin (n + 1))) : s.excenter signs = (Finset.affineCombination ℝ Finset.univ s.points) (s.excenterWeights signs)
• Affine.Simplex.incenter_eq_affineCombination 📋 Mathlib.Geometry.Euclidean.Incenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex ℝ P n) : s.incenter = (Finset.affineCombination ℝ Finset.univ s.points) (s.excenterWeights ∅)
• Affine.Simplex.affineCombination_touchpointWeights 📋 Mathlib.Geometry.Euclidean.Incenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] (s : Affine.Simplex ℝ P n) (signs : Finset (Fin (n + 1))) (i : Fin (n + 1)) : (Finset.affineCombination ℝ Finset.univ s.points) (s.touchpointWeights signs i) = s.touchpoint signs i
• Affine.Simplex.ExcenterExists.affineCombination_eq_excenter_iff 📋 Mathlib.Geometry.Euclidean.Incenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] {s : Affine.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
• Affine.Simplex.affineCombination_eq_touchpoint_iff 📋 Mathlib.Geometry.Euclidean.Incenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} [NeZero n] {s : Affine.Simplex ℝ P n} {signs : Finset (Fin (n + 1))} {i : Fin (n + 1)} {w : Fin (n + 1) → ℝ} (hw : ∑ j, w j = 1) : (Finset.affineCombination ℝ Finset.univ s.points) w = s.touchpoint signs i ↔ w = s.touchpointWeights signs i
• Affine.Simplex.circumcenter_eq_affineCombination_of_pointsWithCircumcenter 📋 Mathlib.Geometry.Euclidean.Circumcenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} (s : Affine.Simplex ℝ P n) : s.circumcenter = (Finset.affineCombination ℝ Finset.univ s.pointsWithCircumcenter) (Affine.Simplex.circumcenterWeightsWithCircumcenter n)
• Affine.Simplex.point_eq_affineCombination_of_pointsWithCircumcenter 📋 Mathlib.Geometry.Euclidean.Circumcenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} (s : Affine.Simplex ℝ P n) (i : Fin (n + 1)) : s.points i = (Finset.affineCombination ℝ Finset.univ s.pointsWithCircumcenter) (Affine.Simplex.pointWeightsWithCircumcenter i)
• Affine.Simplex.centroid_eq_affineCombination_of_pointsWithCircumcenter 📋 Mathlib.Geometry.Euclidean.Circumcenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} (s : Affine.Simplex ℝ P n) (fs : Finset (Fin (n + 1))) : Finset.centroid ℝ fs s.points = (Finset.affineCombination ℝ Finset.univ s.pointsWithCircumcenter) (Affine.Simplex.centroidWeightsWithCircumcenter fs)
• Affine.Simplex.reflection_circumcenter_eq_affineCombination_of_pointsWithCircumcenter 📋 Mathlib.Geometry.Euclidean.Circumcenter
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} (s : Affine.Simplex ℝ P n) {i₁ i₂ : Fin (n + 1)} (h : i₁ ≠ i₂) : (EuclideanGeometry.reflection (affineSpan ℝ (s.points '' {i₁, i₂}))) s.circumcenter = (Finset.affineCombination ℝ Finset.univ s.pointsWithCircumcenter) (Affine.Simplex.reflectionCircumcenterWeightsWithCircumcenter i₁ i₂)
• Affine.Simplex.mongePoint_eq_affineCombination_of_pointsWithCircumcenter 📋 Mathlib.Geometry.Euclidean.MongePoint
  {V : Type u_1} {P : Type u_2} [NormedAddCommGroup V] [InnerProductSpace ℝ V] [MetricSpace P] [NormedAddTorsor V P] {n : ℕ} (s : Affine.Simplex ℝ P (n + 2)) : s.mongePoint = (Finset.affineCombination ℝ Finset.univ s.pointsWithCircumcenter) (Affine.Simplex.mongePointWeightsWithCircumcenter n)

About

Loogle searches Lean and Mathlib definitions and theorems.

You can use Loogle from within the Lean4 VSCode language extension using the Loogle command from the command palette. You can also try the #loogle command from LeanSearchClient, the CLI version, the Loogle VS Code extension, the lean.nvim integration or the Zulip bot.

Usage

Loogle finds definitions and lemmas in various ways:

1. By constant:
   🔍 Real.sin
   finds all lemmas whose statement somehow mentions the sine function.

2. By lemma name substring:
   🔍 "differ"
   finds all lemmas that have "differ" somewhere in their lemma name.

3. By subexpression:
   🔍 _ * (_ ^ _)
   finds all lemmas whose statements somewhere include a product where the second argument is raised to some power.

   The pattern can also be non-linear, as in
   🔍 Real.sqrt ?a * Real.sqrt ?a

   If the pattern has parameters, they are matched in any order. Both of these will find List.map:
   🔍 (?a -> ?b) -> List ?a -> List ?b
   🔍 List ?a -> (?a -> ?b) -> List ?b

4. By main conclusion:
   🔍 |- tsum _ = _ * tsum _
   finds all lemmas where the conclusion (the subexpression to the right of all → and ∀) has the given shape.

   As before, if the pattern has parameters, they are matched against the hypotheses of the lemma in any order; for example,
   🔍 |- _ < _ → tsum _ < tsum _
   will find tsum_lt_tsum even though the hypothesis f i < g i is not the last.

5. You can filter for definitions vs theorems: Using ⊢ (_ : Type _) finds all definitions which provide data while ⊢ (_ : Prop) finds all theorems (and definitions of proofs).

If you pass more than one such search filter, separated by commas Loogle will return lemmas which match all of them. The search
🔍 Real.sin, "two", tsum, _ * _, _ ^ _, |- _ < _ → _
would find all lemmas which mention the constants Real.sin and tsum, have "two" as a substring of the lemma name, include a product and a power somewhere in the type, and have a hypothesis of the form _ < _ (if there were any such lemmas). Metavariables (?a) are assigned independently in each filter.

The #lucky button will directly send you to the documentation of the first hit.

Source code

You can find the source code for this service at https://github.com/nomeata/loogle. The https://loogle.lean-lang.org/ service is provided by the Lean FRO. Please review the Lean FRO Terms of Use and Privacy Policy.

This is Loogle revision 9f11169 serving mathlib revision ce5dd8c