Module: Mathlib.Combinatorics.Tiling.Tile

Goal state before:
pp: case refine_2.index
G : Type u_1
X : Type u_2
ιₚ : Type u_3
inst✝¹ : Group G
inst✝ : MulAction G X
ps : Protoset G X ιₚ
i₁ : ιₚ
g₁ g₂ : G ⧸ Subgroup.map (MulAction.stabilizer G ↑(↑ps i₁)).subtype (↑ps i₁).symmetries
x✝ :
  { index := i₁, groupElts := g₁ }.index = { index := i₁, groupElts := g₂ }.index ∧
    Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₁ }.groupElts} =
      Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₂ }.groupElts}
hq :
  Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₁ }.groupElts} =
    Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₂ }.groupElts}
⊢ { index := i₁, groupElts := g₁ }.index = { index := i₁, groupElts := g₂ }.index

pp: case refine_2.groupElts
G : Type u_1
X : Type u_2
ιₚ : Type u_3
inst✝¹ : Group G
inst✝ : MulAction G X
ps : Protoset G X ιₚ
i₁ : ιₚ
g₁ g₂ : G ⧸ Subgroup.map (MulAction.stabilizer G ↑(↑ps i₁)).subtype (↑ps i₁).symmetries
x✝ :
  { index := i₁, groupElts := g₁ }.index = { index := i₁, groupElts := g₂ }.index ∧
    Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₁ }.groupElts} =
      Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₂ }.groupElts}
hq :
  Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₁ }.groupElts} =
    Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₂ }.groupElts}
⊢ { index := i₁, groupElts := g₁ }.groupElts ≍ { index := i₁, groupElts := g₂ }.groupElts

Tactic:
· rfl

Goal state after:
case refine_2.groupElts
G : Type u_1
X : Type u_2
ιₚ : Type u_3
inst✝¹ : Group G
inst✝ : MulAction G X
ps : Protoset G X ιₚ
i₁ : ιₚ
g₁ g₂ : G ⧸ Subgroup.map (MulAction.stabilizer G ↑(↑ps i₁)).subtype (↑ps i₁).symmetries
x✝ :
  { index := i₁, groupElts := g₁ }.index = { index := i₁, groupElts := g₂ }.index ∧
    Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₁ }.groupElts} =
      Quotient.mk
          (QuotientGroup.leftRel
            (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
              (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
        {{ index := i₁, groupElts := g₂ }.groupElts}
hq :
  Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₁ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₁ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₁ }.groupElts} =
    Quotient.mk
        (QuotientGroup.leftRel
          (Subgroup.map (MulAction.stabilizer G ↑(↑ps { index := i₁, groupElts := g₂ }.index)).subtype
            (↑ps { index := i₁, groupElts := g₂ }.index).symmetries)) ⁻¹'
      {{ index := i₁, groupElts := g₂ }.groupElts}
⊢ { index := i₁, groupElts := g₁ }.groupElts ≍ { index := i₁, groupElts := g₂ }.groupElts