Mul-opposite subgroups #

Tags #

subgroup, subgroups

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def Subgroup.op {G : Type u_2} [Group G] (H : Subgroup G) :

Subgroup Gᵐᵒᵖ

Pull a subgroup back to an opposite subgroup along MulOpposite.unop

Equations

H.op = { carrier := MulOpposite.unop ⁻¹' ↑H, mul_mem' := ⋯, one_mem' := ⋯, inv_mem' := ⋯ }

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def AddSubgroup.op {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

AddSubgroup Gᵃᵒᵖ

Pull an additive subgroup back to an opposite additive subgroup along AddOpposite.unop

Equations

H.op = { carrier := AddOpposite.unop ⁻¹' ↑H, add_mem' := ⋯, zero_mem' := ⋯, neg_mem' := ⋯ }

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@[simp]

theorem AddSubgroup.coe_op {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

↑H.op = AddOpposite.unop ⁻¹' ↑H

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@[simp]

theorem Subgroup.coe_op {G : Type u_2} [Group G] (H : Subgroup G) :

↑H.op = MulOpposite.unop ⁻¹' ↑H

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@[simp]

theorem Subgroup.mem_op {G : Type u_2} [Group G] {x : Gᵐᵒᵖ} {S : Subgroup G} :

x ∈ S.op ↔ MulOpposite.unop x ∈ S

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@[simp]

theorem AddSubgroup.mem_op {G : Type u_2} [AddGroup G] {x : Gᵃᵒᵖ} {S : AddSubgroup G} :

x ∈ S.op ↔ AddOpposite.unop x ∈ S

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@[simp]

theorem Subgroup.op_toSubmonoid {G : Type u_2} [Group G] (H : Subgroup G) :

H.op.toSubmonoid = H.op

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@[simp]

theorem AddSubgroup.op_toAddSubmonoid {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

H.op.toAddSubmonoid = H.op

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def Subgroup.unop {G : Type u_2} [Group G] (H : Subgroup Gᵐᵒᵖ) :

Subgroup G

Pull an opposite subgroup back to a subgroup along MulOpposite.op

Equations

H.unop = { carrier := MulOpposite.op ⁻¹' ↑H, mul_mem' := ⋯, one_mem' := ⋯, inv_mem' := ⋯ }

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def AddSubgroup.unop {G : Type u_2} [AddGroup G] (H : AddSubgroup Gᵃᵒᵖ) :

AddSubgroup G

Pull an opposite additive subgroup back to an additive subgroup along AddOpposite.op

Equations

H.unop = { carrier := AddOpposite.op ⁻¹' ↑H, add_mem' := ⋯, zero_mem' := ⋯, neg_mem' := ⋯ }

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@[simp]

theorem Subgroup.coe_unop {G : Type u_2} [Group G] (H : Subgroup Gᵐᵒᵖ) :

↑H.unop = MulOpposite.op ⁻¹' ↑H

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@[simp]

theorem AddSubgroup.coe_unop {G : Type u_2} [AddGroup G] (H : AddSubgroup Gᵃᵒᵖ) :

↑H.unop = AddOpposite.op ⁻¹' ↑H

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@[simp]

theorem Subgroup.mem_unop {G : Type u_2} [Group G] {x : G} {S : Subgroup Gᵐᵒᵖ} :

x ∈ S.unop ↔ MulOpposite.op x ∈ S

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@[simp]

theorem AddSubgroup.mem_unop {G : Type u_2} [AddGroup G] {x : G} {S : AddSubgroup Gᵃᵒᵖ} :

x ∈ S.unop ↔ AddOpposite.op x ∈ S

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@[simp]

theorem Subgroup.unop_toSubmonoid {G : Type u_2} [Group G] (H : Subgroup Gᵐᵒᵖ) :

H.unop.toSubmonoid = H.unop

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@[simp]

theorem AddSubgroup.unop_toAddSubmonoid {G : Type u_2} [AddGroup G] (H : AddSubgroup Gᵃᵒᵖ) :

H.unop.toAddSubmonoid = H.unop

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@[simp]

theorem Subgroup.unop_op {G : Type u_2} [Group G] (S : Subgroup G) :

S.op.unop = S

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@[simp]

theorem AddSubgroup.unop_op {G : Type u_2} [AddGroup G] (S : AddSubgroup G) :

S.op.unop = S

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@[simp]

theorem Subgroup.op_unop {G : Type u_2} [Group G] (S : Subgroup Gᵐᵒᵖ) :

S.unop.op = S

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@[simp]

theorem AddSubgroup.op_unop {G : Type u_2} [AddGroup G] (S : AddSubgroup Gᵃᵒᵖ) :

S.unop.op = S

Lattice results #

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theorem Subgroup.op_le_iff {G : Type u_2} [Group G] {S₁ : Subgroup G} {S₂ : Subgroup Gᵐᵒᵖ} :

S₁.op ≤ S₂ ↔ S₁ ≤ S₂.unop

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theorem AddSubgroup.op_le_iff {G : Type u_2} [AddGroup G] {S₁ : AddSubgroup G} {S₂ : AddSubgroup Gᵃᵒᵖ} :

S₁.op ≤ S₂ ↔ S₁ ≤ S₂.unop

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theorem Subgroup.le_op_iff {G : Type u_2} [Group G] {S₁ : Subgroup Gᵐᵒᵖ} {S₂ : Subgroup G} :

S₁ ≤ S₂.op ↔ S₁.unop ≤ S₂

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theorem AddSubgroup.le_op_iff {G : Type u_2} [AddGroup G] {S₁ : AddSubgroup Gᵃᵒᵖ} {S₂ : AddSubgroup G} :

S₁ ≤ S₂.op ↔ S₁.unop ≤ S₂

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@[simp]

theorem Subgroup.op_le_op_iff {G : Type u_2} [Group G] {S₁ S₂ : Subgroup G} :

S₁.op ≤ S₂.op ↔ S₁ ≤ S₂

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@[simp]

theorem AddSubgroup.op_le_op_iff {G : Type u_2} [AddGroup G] {S₁ S₂ : AddSubgroup G} :

S₁.op ≤ S₂.op ↔ S₁ ≤ S₂

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@[simp]

theorem Subgroup.unop_le_unop_iff {G : Type u_2} [Group G] {S₁ S₂ : Subgroup Gᵐᵒᵖ} :

S₁.unop ≤ S₂.unop ↔ S₁ ≤ S₂

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@[simp]

theorem AddSubgroup.unop_le_unop_iff {G : Type u_2} [AddGroup G] {S₁ S₂ : AddSubgroup Gᵃᵒᵖ} :

S₁.unop ≤ S₂.unop ↔ S₁ ≤ S₂

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def Subgroup.opEquiv {G : Type u_2} [Group G] :

Subgroup G ≃o Subgroup Gᵐᵒᵖ

A subgroup H of G determines a subgroup H.op of the opposite group Gᵐᵒᵖ.

Equations

Subgroup.opEquiv = { toFun := Subgroup.op, invFun := Subgroup.unop, left_inv := ⋯, right_inv := ⋯, map_rel_iff' := ⋯ }

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def AddSubgroup.opEquiv {G : Type u_2} [AddGroup G] :

AddSubgroup G ≃o AddSubgroup Gᵃᵒᵖ

An additive subgroup H of G determines an additive subgroup H.op of the opposite additive group Gᵃᵒᵖ.

Equations

AddSubgroup.opEquiv = { toFun := AddSubgroup.op, invFun := AddSubgroup.unop, left_inv := ⋯, right_inv := ⋯, map_rel_iff' := ⋯ }

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@[simp]

theorem AddSubgroup.opEquiv_apply {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

opEquiv H = H.op

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@[simp]

theorem AddSubgroup.opEquiv_symm_apply {G : Type u_2} [AddGroup G] (H : AddSubgroup Gᵃᵒᵖ) :

(RelIso.symm opEquiv) H = H.unop

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@[simp]

theorem Subgroup.opEquiv_apply {G : Type u_2} [Group G] (H : Subgroup G) :

opEquiv H = H.op

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@[simp]

theorem Subgroup.opEquiv_symm_apply {G : Type u_2} [Group G] (H : Subgroup Gᵐᵒᵖ) :

(RelIso.symm opEquiv) H = H.unop

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theorem Subgroup.op_injective {G : Type u_2} [Group G] :

Function.Injective Subgroup.op

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theorem AddSubgroup.op_injective {G : Type u_2} [AddGroup G] :

Function.Injective AddSubgroup.op

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theorem Subgroup.unop_injective {G : Type u_2} [Group G] :

Function.Injective Subgroup.unop

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theorem AddSubgroup.unop_injective {G : Type u_2} [AddGroup G] :

Function.Injective AddSubgroup.unop

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@[simp]

theorem Subgroup.op_inj {G : Type u_2} [Group G] {S T : Subgroup G} :

S.op = T.op ↔ S = T

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@[simp]

theorem AddSubgroup.op_inj {G : Type u_2} [AddGroup G] {S T : AddSubgroup G} :

S.op = T.op ↔ S = T

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@[simp]

theorem Subgroup.unop_inj {G : Type u_2} [Group G] {S T : Subgroup Gᵐᵒᵖ} :

S.unop = T.unop ↔ S = T

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@[simp]

theorem AddSubgroup.unop_inj {G : Type u_2} [AddGroup G] {S T : AddSubgroup Gᵃᵒᵖ} :

S.unop = T.unop ↔ S = T

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def Subgroup.equivOp {G : Type u_2} [Group G] (H : Subgroup G) :

↥H ≃ ↥H.op

Bijection between a subgroup H and its opposite.

Equations

H.equivOp = MulOpposite.opEquiv.subtypeEquiv ⋯

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def AddSubgroup.equivOp {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

↥H ≃ ↥H.op

Bijection between an additive subgroup H and its opposite.

Equations

H.equivOp = AddOpposite.opEquiv.subtypeEquiv ⋯

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@[simp]

theorem Subgroup.equivOp_symm_apply_coe {G : Type u_2} [Group G] (H : Subgroup G) (b : ↥H.op) :

↑(H.equivOp.symm b) = MulOpposite.unop ↑b

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@[simp]

theorem Subgroup.equivOp_apply_coe {G : Type u_2} [Group G] (H : Subgroup G) (a : ↥H) :

↑(H.equivOp a) = MulOpposite.op ↑a

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@[simp]

theorem AddSubgroup.equivOp_apply_coe {G : Type u_2} [AddGroup G] (H : AddSubgroup G) (a : ↥H) :

↑(H.equivOp a) = AddOpposite.op ↑a

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@[simp]

theorem AddSubgroup.equivOp_symm_apply_coe {G : Type u_2} [AddGroup G] (H : AddSubgroup G) (b : ↥H.op) :

↑(H.equivOp.symm b) = AddOpposite.unop ↑b

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theorem Subgroup.op_normalizer {G : Type u_2} [Group G] (H : Subgroup G) :

H.normalizer.op = H.op.normalizer

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theorem AddSubgroup.op_normalizer {G : Type u_2} [AddGroup G] (H : AddSubgroup G) :

H.normalizer.op = H.op.normalizer

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theorem Subgroup.unop_normalizer {G : Type u_2} [Group G] (H : Subgroup Gᵐᵒᵖ) :

H.normalizer.unop = H.unop.normalizer

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theorem AddSubgroup.unop_normalizer {G : Type u_2} [AddGroup G] (H : AddSubgroup Gᵃᵒᵖ) :

H.normalizer.unop = H.unop.normalizer

Documentation

Mathlib.Algebra.Group.Subgroup.MulOpposite

Mul-opposite subgroups #

Tags #

Lattice results #