The category of comonoids in a monoidal category. #

We define comonoids in a monoidal category C, and show that they are equivalently monoid objects in the opposite category.

We construct the monoidal structure on Comon_ C, when C is braided.

An oplax monoidal functor takes comonoid objects to comonoid objects. That is, a oplax monoidal functor F : C ⥤ D induces a functor Comon_ C ⥤ Comon_ D.

TODO #

Comonoid objects in C are "just" oplax monoidal functors from the trivial monoidal category to C.

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class Comon_Class {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) :

Type v₁

A comonoid object internal to a monoidal category.

When the monoidal category is preadditive, this is also sometimes called a "coalgebra object".

counit : X ⟶ 𝟙_ C
The counit morphism of a comonoid object.
comul : X ⟶ CategoryTheory.MonoidalCategory.tensorObj X X
The comultiplication morphism of a comonoid object.
counit_comul' : CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.counit X) = (CategoryTheory.MonoidalCategory.leftUnitor X).inv
comul_counit' : CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.counit) = (CategoryTheory.MonoidalCategory.rightUnitor X).inv
comul_assoc' : CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.comul) = CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.comul X) (CategoryTheory.MonoidalCategory.associator X X X).hom)

Instances

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def Comon_Class.termΔ :

Lean.ParserDescr

The comultiplication morphism of a comonoid object.

Equations

Comon_Class.termΔ = Lean.ParserDescr.node `Comon_Class.termΔ 1024 (Lean.ParserDescr.symbol "Δ")

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def Comon_Class.«termΔ[_]» :

Lean.ParserDescr

The comultiplication morphism of a comonoid object.

Equations

One or more equations did not get rendered due to their size.

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def Comon_Class.termε :

Lean.ParserDescr

The counit morphism of a comonoid object.

Equations

Comon_Class.termε = Lean.ParserDescr.node `Comon_Class.termε 1024 (Lean.ParserDescr.symbol "ε")

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def Comon_Class.«termε[_]» :

Lean.ParserDescr

The counit morphism of a comonoid object.

Equations

One or more equations did not get rendered due to their size.

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theorem Comon_Class.counit_comul'_assoc {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {X : C} [self : Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj (𝟙_ C) X ⟶ Z) :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.counit X) h) = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.leftUnitor X).inv h

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theorem Comon_Class.comul_assoc'_assoc {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {X : C} [self : Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj X (CategoryTheory.MonoidalCategory.tensorObj X X) ⟶ Z) :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.comul) h) = CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.comul X) (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.associator X X X).hom h))

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theorem Comon_Class.comul_counit'_assoc {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {X : C} [self : Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj X (𝟙_ C) ⟶ Z) :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.counit) h) = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.rightUnitor X).inv h

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@[simp]

theorem Comon_Class.counit_comul {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.counit X) = (CategoryTheory.MonoidalCategory.leftUnitor X).inv

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@[simp]

theorem Comon_Class.counit_comul_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj (𝟙_ C) X ⟶ Z) :

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@[simp]

theorem Comon_Class.comul_counit {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.counit) = (CategoryTheory.MonoidalCategory.rightUnitor X).inv

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@[simp]

theorem Comon_Class.comul_counit_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj X (𝟙_ C) ⟶ Z) :

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@[simp]

theorem Comon_Class.comul_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.whiskerLeft X Comon_Class.comul) = CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight Comon_Class.comul X) (CategoryTheory.MonoidalCategory.associator X X X).hom)

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@[simp]

theorem Comon_Class.comul_assoc_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj X (CategoryTheory.MonoidalCategory.tensorObj X X) ⟶ Z) :

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class IsComon_Hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : C} [Comon_Class M] [Comon_Class N] (f : M ⟶ N) :

Prop

The property that a morphism between comonoid objects is a comonoid morphism.

hom_counit : CategoryTheory.CategoryStruct.comp f Comon_Class.counit = Comon_Class.counit
hom_comul : CategoryTheory.CategoryStruct.comp f Comon_Class.comul = CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.MonoidalCategory.tensorHom f f)

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@[simp]

theorem IsComon_Hom.hom_counit_assoc {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {M N : C} {inst✝² : Comon_Class M} {inst✝³ : Comon_Class N} {f : M ⟶ N} [self : IsComon_Hom f] {Z : C} (h : 𝟙_ C ⟶ Z) :

CategoryTheory.CategoryStruct.comp f (CategoryTheory.CategoryStruct.comp Comon_Class.counit h) = CategoryTheory.CategoryStruct.comp Comon_Class.counit h

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@[simp]

theorem IsComon_Hom.hom_comul_assoc {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {M N : C} {inst✝² : Comon_Class M} {inst✝³ : Comon_Class N} {f : M ⟶ N} [self : IsComon_Hom f] {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj N N ⟶ Z) :

CategoryTheory.CategoryStruct.comp f (CategoryTheory.CategoryStruct.comp Comon_Class.comul h) = CategoryTheory.CategoryStruct.comp Comon_Class.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom f f) h)

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structure Comon_ (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

Type (max u₁ v₁)

A comonoid object internal to a monoidal category.

When the monoidal category is preadditive, this is also sometimes called a "coalgebra object".

X : C
The underlying object of a comonoid object.
counit : self.X ⟶ 𝟙_ C
The counit of a comonoid object.
comul : self.X ⟶ CategoryTheory.MonoidalCategory.tensorObj self.X self.X
The comultiplication morphism of a comonoid object.
counit_comul : CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.MonoidalCategory.whiskerRight self.counit self.X) = (CategoryTheory.MonoidalCategory.leftUnitor self.X).inv
comul_counit : CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.MonoidalCategory.whiskerLeft self.X self.counit) = (CategoryTheory.MonoidalCategory.rightUnitor self.X).inv
comul_assoc : CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.MonoidalCategory.whiskerLeft self.X self.comul) = CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight self.comul self.X) (CategoryTheory.MonoidalCategory.associator self.X self.X self.X).hom)

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@[simp]

theorem Comon_.counit_comul_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (self : Comon_ C) {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj (𝟙_ C) self.X ⟶ Z) :

CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight self.counit self.X) h) = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.leftUnitor self.X).inv h

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@[simp]

theorem Comon_.comul_counit_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (self : Comon_ C) {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj self.X (𝟙_ C) ⟶ Z) :

CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft self.X self.counit) h) = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.rightUnitor self.X).inv h

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@[simp]

theorem Comon_.comul_assoc_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (self : Comon_ C) {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj self.X (CategoryTheory.MonoidalCategory.tensorObj self.X self.X) ⟶ Z) :

CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft self.X self.comul) h) = CategoryTheory.CategoryStruct.comp self.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight self.comul self.X) (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.associator self.X self.X self.X).hom h))

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def Comon_.mk' {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

Comon_ C

Construct an object of Comon_ C from an object X : C and Comon_Class X instance.

Equations

Comon_.mk' X = { X := X, counit := Comon_Class.counit, comul := Comon_Class.comul, counit_comul := ⋯, comul_counit := ⋯, comul_assoc := ⋯ }

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theorem Comon_.mk'_counit {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

(Comon_.mk' X).counit = Comon_Class.counit

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@[simp]

theorem Comon_.mk'_comul {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

(Comon_.mk' X).comul = Comon_Class.comul

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theorem Comon_.mk'_X {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (X : C) [Comon_Class X] :

(Comon_.mk' X).X = X

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instance Comon_.instComon_ClassX {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} :

Comon_Class M.X

Equations

Comon_.instComon_ClassX = { counit := M.counit, comul := M.comul, counit_comul' := ⋯, comul_counit' := ⋯, comul_assoc' := ⋯ }

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def Comon_.trivial (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

Comon_ C

The trivial comonoid object. We later show this is terminal in Comon_ C.

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One or more equations did not get rendered due to their size.

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theorem Comon_.trivial_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.trivial C).X = 𝟙_ C

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@[simp]

theorem Comon_.trivial_comul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.trivial C).comul = (CategoryTheory.MonoidalCategory.leftUnitor (𝟙_ C)).inv

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@[simp]

theorem Comon_.trivial_counit (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.trivial C).counit = CategoryTheory.CategoryStruct.id (𝟙_ C)

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instance Comon_.instInhabited (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

Inhabited (Comon_ C)

Equations

Comon_.instInhabited C = { default := Comon_.trivial C }

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theorem Comon_.counit_comul_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} {Z : C} (f : M.X ⟶ Z) :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom M.counit f) = CategoryTheory.CategoryStruct.comp f (CategoryTheory.MonoidalCategory.leftUnitor Z).inv

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theorem Comon_.counit_comul_hom_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} {Z : C} (f : M.X ⟶ Z) {Z✝ : C} (h : CategoryTheory.MonoidalCategory.tensorObj (𝟙_ C) Z ⟶ Z✝) :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom M.counit f) h) = CategoryTheory.CategoryStruct.comp f (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.leftUnitor Z).inv h)

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@[simp]

theorem Comon_.comul_counit_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} {Z : C} (f : M.X ⟶ Z) :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom f M.counit) = CategoryTheory.CategoryStruct.comp f (CategoryTheory.MonoidalCategory.rightUnitor Z).inv

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@[simp]

theorem Comon_.comul_counit_hom_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} {Z : C} (f : M.X ⟶ Z) {Z✝ : C} (h : CategoryTheory.MonoidalCategory.tensorObj Z (𝟙_ C) ⟶ Z✝) :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom f M.counit) h) = CategoryTheory.CategoryStruct.comp f (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.rightUnitor Z).inv h)

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theorem Comon_.comul_assoc_flip {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.whiskerRight M.comul M.X) = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft M.X M.comul) (CategoryTheory.MonoidalCategory.associator M.X M.X M.X).inv)

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theorem Comon_.comul_assoc_flip_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M : Comon_ C} {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj (CategoryTheory.MonoidalCategory.tensorObj M.X M.X) M.X ⟶ Z) :

CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerRight M.comul M.X) h) = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.whiskerLeft M.X M.comul) (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.associator M.X M.X M.X).inv h))

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structure Comon_.Hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (M N : Comon_ C) :

Type v₁

A morphism of comonoid objects.

hom : M.X ⟶ N.X
The underlying morphism of a morphism of comonoid objects.
hom_counit : CategoryTheory.CategoryStruct.comp self.hom N.counit = M.counit
hom_comul : CategoryTheory.CategoryStruct.comp self.hom N.comul = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom self.hom self.hom)

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theorem Comon_.Hom.ext {C : Type u₁} {inst✝ : CategoryTheory.Category.{v₁, u₁} C} {inst✝¹ : CategoryTheory.MonoidalCategory C} {M N : Comon_ C} {x y : M.Hom N} (hom : x.hom = y.hom) :

x = y

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theorem Comon_.Hom.hom_comul_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : Comon_ C} (self : M.Hom N) {Z : C} (h : CategoryTheory.MonoidalCategory.tensorObj N.X N.X ⟶ Z) :

CategoryTheory.CategoryStruct.comp self.hom (CategoryTheory.CategoryStruct.comp N.comul h) = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom self.hom self.hom) h)

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@[simp]

theorem Comon_.Hom.hom_counit_assoc {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : Comon_ C} (self : M.Hom N) {Z : C} (h : 𝟙_ C ⟶ Z) :

CategoryTheory.CategoryStruct.comp self.hom (CategoryTheory.CategoryStruct.comp N.counit h) = CategoryTheory.CategoryStruct.comp M.counit h

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def Comon_.id {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (M : Comon_ C) :

M.Hom M

The identity morphism on a comonoid object.

Equations

M.id = { hom := CategoryTheory.CategoryStruct.id M.X, hom_counit := ⋯, hom_comul := ⋯ }

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@[simp]

theorem Comon_.id_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (M : Comon_ C) :

M.id.hom = CategoryTheory.CategoryStruct.id M.X

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instance Comon_.homInhabited {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (M : Comon_ C) :

Inhabited (M.Hom M)

Equations

M.homInhabited = { default := M.id }

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def Comon_.comp {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N O : Comon_ C} (f : M.Hom N) (g : N.Hom O) :

M.Hom O

Composition of morphisms of monoid objects.

Equations

Comon_.comp f g = { hom := CategoryTheory.CategoryStruct.comp f.hom g.hom, hom_counit := ⋯, hom_comul := ⋯ }

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@[simp]

theorem Comon_.comp_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N O : Comon_ C} (f : M.Hom N) (g : N.Hom O) :

(Comon_.comp f g).hom = CategoryTheory.CategoryStruct.comp f.hom g.hom

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instance Comon_.instCategory {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

CategoryTheory.Category.{v₁, max u₁ v₁} (Comon_ C)

Equations

Comon_.instCategory = CategoryTheory.Category.mk ⋯ ⋯ ⋯

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theorem Comon_.ext {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {X Y : Comon_ C} {f g : X ⟶ Y} (w : f.hom = g.hom) :

f = g

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@[simp]

theorem Comon_.id_hom' {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (M : Comon_ C) :

(CategoryTheory.CategoryStruct.id M).hom = CategoryTheory.CategoryStruct.id M.X

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@[simp]

theorem Comon_.comp_hom' {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N K : Comon_ C} (f : M ⟶ N) (g : N ⟶ K) :

(CategoryTheory.CategoryStruct.comp f g).hom = CategoryTheory.CategoryStruct.comp f.hom g.hom

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def Comon_.forget (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

CategoryTheory.Functor (Comon_ C) C

The forgetful functor from comonoid objects to the ambient category.

Equations

Comon_.forget C = { obj := fun (A : Comon_ C) => A.X, map := fun {X Y : Comon_ C} (f : X ⟶ Y) => f.hom, map_id := ⋯, map_comp := ⋯ }

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@[simp]

theorem Comon_.forget_obj (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

(Comon_.forget C).obj A = A.X

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@[simp]

theorem Comon_.forget_map (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {X✝ Y✝ : Comon_ C} (f : X✝ ⟶ Y✝) :

(Comon_.forget C).map f = f.hom

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instance Comon_.forget_faithful {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.forget C).Faithful

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instance Comon_.instIsIsoHomOfMapForget {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {A B : Comon_ C} (f : A ⟶ B) [e : CategoryTheory.IsIso ((Comon_.forget C).map f)] :

CategoryTheory.IsIso f.hom

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instance Comon_.instReflectsIsomorphismsForget {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.forget C).ReflectsIsomorphisms

The forgetful functor from comonoid objects to the ambient category reflects isomorphisms.

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def Comon_.mkIso {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : Comon_ C} (f : M.X ≅ N.X) (f_counit : CategoryTheory.CategoryStruct.comp f.hom N.counit = M.counit := by aesop_cat) (f_comul : CategoryTheory.CategoryStruct.comp f.hom N.comul = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom f.hom f.hom) := by aesop_cat) :

M ≅ N

Construct an isomorphism of comonoids by giving an isomorphism between the underlying objects and checking compatibility with counit and comultiplication only in the forward direction.

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theorem Comon_.mkIso_inv_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : Comon_ C} (f : M.X ≅ N.X) (f_counit : CategoryTheory.CategoryStruct.comp f.hom N.counit = M.counit := by aesop_cat) (f_comul : CategoryTheory.CategoryStruct.comp f.hom N.comul = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom f.hom f.hom) := by aesop_cat) :

(Comon_.mkIso f f_counit f_comul).inv.hom = f.inv

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theorem Comon_.mkIso_hom_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {M N : Comon_ C} (f : M.X ≅ N.X) (f_counit : CategoryTheory.CategoryStruct.comp f.hom N.counit = M.counit := by aesop_cat) (f_comul : CategoryTheory.CategoryStruct.comp f.hom N.comul = CategoryTheory.CategoryStruct.comp M.comul (CategoryTheory.MonoidalCategory.tensorHom f.hom f.hom) := by aesop_cat) :

(Comon_.mkIso f f_counit f_comul).hom.hom = f.hom

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instance Comon_.uniqueHomToTrivial {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

Unique (A ⟶ Comon_.trivial C)

Equations

A.uniqueHomToTrivial = { default := { hom := A.counit, hom_counit := ⋯, hom_comul := ⋯ }, uniq := ⋯ }

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theorem Comon_.uniqueHomToTrivial_default_hom {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

default.hom = A.counit

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instance Comon_.instHasTerminal {C : Type u₁} [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

CategoryTheory.Limits.HasTerminal (Comon_ C)

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def Comon_.Comon_ToMon_OpOp_obj' (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

Mon_ Cᵒᵖ

Turn a comonoid object into a monoid object in the opposite category.

Equations

Comon_.Comon_ToMon_OpOp_obj' C A = { X := Opposite.op A.X, one := A.counit.op, mul := A.comul.op, one_mul := ⋯, mul_one := ⋯, mul_assoc := ⋯ }

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theorem Comon_.Comon_ToMon_OpOp_obj'_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

(Comon_.Comon_ToMon_OpOp_obj' C A).X = Opposite.op A.X

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theorem Comon_.Comon_ToMon_OpOp_obj'_mul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

(Comon_.Comon_ToMon_OpOp_obj' C A).mul = A.comul.op

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theorem Comon_.Comon_ToMon_OpOp_obj'_one (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

(Comon_.Comon_ToMon_OpOp_obj' C A).one = A.counit.op

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def Comon_.Comon_ToMon_OpOp (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

CategoryTheory.Functor (Comon_ C) (Mon_ Cᵒᵖ)ᵒᵖ

The contravariant functor turning comonoid objects into monoid objects in the opposite category.

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theorem Comon_.Comon_ToMon_OpOp_obj (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Comon_ C) :

(Comon_.Comon_ToMon_OpOp C).obj A = Opposite.op (Comon_.Comon_ToMon_OpOp_obj' C A)

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theorem Comon_.Comon_ToMon_OpOp_map (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {X✝ Y✝ : Comon_ C} (f : X✝ ⟶ Y✝) :

(Comon_.Comon_ToMon_OpOp C).map f = Opposite.op { hom := f.hom.op, one_hom := ⋯, mul_hom := ⋯ }

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def Comon_.Mon_OpOpToComon_obj' (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Mon_ Cᵒᵖ) :

Comon_ C

Turn a monoid object in the opposite category into a comonoid object.

Equations

Comon_.Mon_OpOpToComon_obj' C A = { X := Opposite.unop A.X, counit := A.one.unop, comul := A.mul.unop, counit_comul := ⋯, comul_counit := ⋯, comul_assoc := ⋯ }

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theorem Comon_.Mon_OpOpToComon_obj'_counit (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Mon_ Cᵒᵖ) :

(Comon_.Mon_OpOpToComon_obj' C A).counit = A.one.unop

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theorem Comon_.Mon_OpOpToComon_obj'_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Mon_ Cᵒᵖ) :

(Comon_.Mon_OpOpToComon_obj' C A).X = Opposite.unop A.X

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theorem Comon_.Mon_OpOpToComon_obj'_comul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : Mon_ Cᵒᵖ) :

(Comon_.Mon_OpOpToComon_obj' C A).comul = A.mul.unop

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def Comon_.Mon_OpOpToComon_ (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

CategoryTheory.Functor (Mon_ Cᵒᵖ)ᵒᵖ (Comon_ C)

The contravariant functor turning monoid objects in the opposite category into comonoid objects.

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theorem Comon_.Mon_OpOpToComon__obj (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] (A : (Mon_ Cᵒᵖ)ᵒᵖ) :

(Comon_.Mon_OpOpToComon_ C).obj A = Comon_.Mon_OpOpToComon_obj' C (Opposite.unop A)

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theorem Comon_.Mon_OpOpToComon__map_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] {X✝ Y✝ : (Mon_ Cᵒᵖ)ᵒᵖ} (f : X✝ ⟶ Y✝) :

((Comon_.Mon_OpOpToComon_ C).map f).hom = f.unop.hom.unop

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def Comon_.Comon_EquivMon_OpOp (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

Comon_ C ≌ (Mon_ Cᵒᵖ)ᵒᵖ

Comonoid objects are contravariantly equivalent to monoid objects in the opposite category.

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theorem Comon_.Comon_EquivMon_OpOp_inverse (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.Comon_EquivMon_OpOp C).inverse = Comon_.Mon_OpOpToComon_ C

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theorem Comon_.Comon_EquivMon_OpOp_unitIso (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.Comon_EquivMon_OpOp C).unitIso = CategoryTheory.NatIso.ofComponents (fun (x : Comon_ C) => CategoryTheory.Iso.refl ((CategoryTheory.Functor.id (Comon_ C)).obj x)) ⋯

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theorem Comon_.Comon_EquivMon_OpOp_counitIso (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.Comon_EquivMon_OpOp C).counitIso = CategoryTheory.NatIso.ofComponents (fun (x : (Mon_ Cᵒᵖ)ᵒᵖ) => CategoryTheory.Iso.refl (((Comon_.Mon_OpOpToComon_ C).comp (Comon_.Comon_ToMon_OpOp C)).obj x)) ⋯

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theorem Comon_.Comon_EquivMon_OpOp_functor (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] :

(Comon_.Comon_EquivMon_OpOp C).functor = Comon_.Comon_ToMon_OpOp C

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instance Comon_.monoidal (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] :

CategoryTheory.MonoidalCategory (Comon_ C)

Comonoid objects in a braided category form a monoidal category.

This definition is via transporting back and forth to monoids in the opposite category,

Equations

Comon_.monoidal C = CategoryTheory.Monoidal.transport (Comon_.Comon_EquivMon_OpOp C).symm

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theorem Comon_.monoidal_tensorUnit_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] :

(𝟙_ (Comon_ C)).X = 𝟙_ C

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theorem Comon_.monoidal_whiskerLeft_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X x✝ x✝¹ : Comon_ C) (f : x✝ ⟶ x✝¹) :

(CategoryTheory.MonoidalCategory.whiskerLeft X f).hom = CategoryTheory.MonoidalCategory.whiskerLeft X.X f.hom

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theorem Comon_.monoidal_leftUnitor_hom_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X : Comon_ C) :

(CategoryTheory.MonoidalCategory.leftUnitor X).hom.hom = (CategoryTheory.MonoidalCategory.leftUnitor X.X).hom

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theorem Comon_.monoidal_whiskerRight_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] {X₁✝ X₂✝ : Comon_ C} (f : X₁✝ ⟶ X₂✝) (X : Comon_ C) :

(CategoryTheory.MonoidalCategory.whiskerRight f X).hom = CategoryTheory.MonoidalCategory.whiskerRight f.hom X.X

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theorem Comon_.monoidal_tensorObj_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X Y : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj X Y).X = CategoryTheory.MonoidalCategory.tensorObj X.X Y.X

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theorem Comon_.monoidal_leftUnitor_inv_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X : Comon_ C) :

(CategoryTheory.MonoidalCategory.leftUnitor X).inv.hom = (CategoryTheory.MonoidalCategory.leftUnitor X.X).inv

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theorem Comon_.monoidal_rightUnitor_inv_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X : Comon_ C) :

(CategoryTheory.MonoidalCategory.rightUnitor X).inv.hom = (CategoryTheory.MonoidalCategory.rightUnitor X.X).inv

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theorem Comon_.monoidal_tensorObj_counit (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X Y : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj X Y).counit = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom X.counit Y.counit) (CategoryTheory.MonoidalCategory.leftUnitor (𝟙_ C)).hom

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theorem Comon_.monoidal_associator_inv_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X Y Z : Comon_ C) :

(CategoryTheory.MonoidalCategory.associator X Y Z).inv.hom = (CategoryTheory.MonoidalCategory.associator X.X Y.X Z.X).inv

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theorem Comon_.monoidal_associator_hom_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X Y Z : Comon_ C) :

(CategoryTheory.MonoidalCategory.associator X Y Z).hom.hom = (CategoryTheory.MonoidalCategory.associator X.X Y.X Z.X).hom

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theorem Comon_.monoidal_tensorUnit_comul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] :

(𝟙_ (Comon_ C)).comul = (CategoryTheory.MonoidalCategory.leftUnitor (𝟙_ C)).inv

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theorem Comon_.monoidal_tensorHom_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] {X₁✝ Y₁✝ X₂✝ Y₂✝ : Comon_ C} (f : X₁✝ ⟶ Y₁✝) (g : X₂✝ ⟶ Y₂✝) :

(CategoryTheory.MonoidalCategory.tensorHom f g).hom = CategoryTheory.MonoidalCategory.tensorHom f.hom g.hom

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theorem Comon_.monoidal_rightUnitor_hom_hom (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X : Comon_ C) :

(CategoryTheory.MonoidalCategory.rightUnitor X).hom.hom = (CategoryTheory.MonoidalCategory.rightUnitor X.X).hom

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theorem Comon_.monoidal_tensorUnit_counit (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] :

(𝟙_ (Comon_ C)).counit = CategoryTheory.CategoryStruct.id (𝟙_ C)

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theorem Comon_.monoidal_tensorObj_comul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (X Y : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj X Y).comul = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom X.comul Y.comul) (CategoryTheory.MonoidalCategory.tensorμ X.X X.X Y.X Y.X)

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theorem Comon_.tensorObj_X (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (A B : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj A B).X = CategoryTheory.MonoidalCategory.tensorObj A.X B.X

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instance Comon_.instComon_ClassTensorObj (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (A B : C) [Comon_Class A] [Comon_Class B] :

Comon_Class (CategoryTheory.MonoidalCategory.tensorObj A B)

Equations

Comon_.instComon_ClassTensorObj C A B = inferInstanceAs (Comon_Class (CategoryTheory.MonoidalCategory.tensorObj (Comon_.mk' A) (Comon_.mk' B)).X)

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theorem Comon_.tensorObj_counit (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (A B : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj A B).counit = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom A.counit B.counit) (CategoryTheory.MonoidalCategory.leftUnitor (𝟙_ C)).hom

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theorem Comon_.tensorObj_comul' (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (A B : Comon_ C) :

(CategoryTheory.MonoidalCategory.tensorObj A B).comul = CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.tensorHom A.comul B.comul) (CategoryTheory.MonoidalCategory.tensorμ (Opposite.op A.X) (Opposite.op B.X) (Opposite.op A.X) (Opposite.op B.X)).unop

Preliminary statement of the comultiplication for a tensor product of comonoids. This version is the definitional equality provided by transport, and not quite as good as the version provided in tensorObj_comul below.

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theorem Comon_.tensorObj_comul (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.MonoidalCategory C] [CategoryTheory.BraidedCategory C] (A B : Comon_ C) :

The comultiplication on the tensor product of two comonoids is the tensor product of the comultiplications followed by the tensor strength (to shuffle the factors back into order).

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