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Mathlib.CategoryTheory.Monoidal.Cartesian.Basic

Categories with chosen finite products #

We introduce a class, CartesianMonoidalCategory, which bundles explicit choices for a terminal object and binary products in a category C. This is primarily useful for categories which have finite products with good definitional properties, such as the category of types.

For better defeqs, we also extend MonoidalCategory.

Implementation notes #

For Cartesian monoidal categories, the oplax-monoidal/monoidal/braided structure of a functor F preserving finite products is uniquely determined. See the ofChosenFiniteProducts declarations.

We however develop the theory for any F.OplaxMonoidal/F.Monoidal/F.Braided instance instead of requiring it to be the ofChosenFiniteProducts one. This is to avoid diamonds: Consider e.g. 𝟭 C and F ⋙ G.

In applications requiring a finite-product-preserving functor to be oplax-monoidal/monoidal/braided, avoid attribute [local instance] ofChosenFiniteProducts but instead turn on the corresponding ofChosenFiniteProducts declaration for that functor only.

Projects #

A monoidal category is semicartesian if the unit for the tensor product is a terminal object.

Instances

    This lemma follows from the preexisting Unique instance, but it is often convenient to use it directly as apply toUnit_unique forcing lean to do the necessary elaboration.

    An instance of CartesianMonoidalCategory C bundles an explicit choice of a binary product of two objects of C, and a terminal object in C.

    Users should use the monoidal notation: X ⊗ Y for the product and 𝟙_ C for the terminal object.

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      @[reducible, inline]

      Implementation of the tensor product for CartesianMonoidalCategory.ofChosenFiniteProducts.

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        @[reducible, inline]
        abbrev CategoryTheory.CartesianMonoidalCategory.ofChosenFiniteProducts.tensorHom {C : Type u} [Category.{v, u} C] ( : (X Y : C) → Limits.LimitCone (Limits.pair X Y)) {X₁ X₂ Y₁ Y₂ : C} (f : X₁ Y₁) (g : X₂ Y₂) :
        tensorObj X₁ X₂ tensorObj Y₁ Y₂

        Implementation of the tensor product of morphisms for CartesianMonoidalCategory.ofChosenFiniteProducts.

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          theorem CategoryTheory.CartesianMonoidalCategory.ofChosenFiniteProducts.tensorHom_comp_tensorHom {C : Type u} [Category.{v, u} C] ( : (X Y : C) → Limits.LimitCone (Limits.pair X Y)) {X₁ X₂ Y₁ Y₂ Z₁ Z₂ : C} (f₁ : X₁ Y₁) (f₂ : X₂ Y₂) (g₁ : Y₁ Z₁) (g₂ : Y₂ Z₂) :
          CategoryStruct.comp (tensorHom f₁ f₂) (tensorHom g₁ g₂) = tensorHom (CategoryStruct.comp f₁ g₁) (CategoryStruct.comp f₂ g₂)
          theorem CategoryTheory.CartesianMonoidalCategory.ofChosenFiniteProducts.associator_naturality {C : Type u} [Category.{v, u} C] ( : (X Y : C) → Limits.LimitCone (Limits.pair X Y)) {X₁ X₂ X₃ Y₁ Y₂ Y₃ : C} (f₁ : X₁ Y₁) (f₂ : X₂ Y₂) (f₃ : X₃ Y₃) :
          CategoryStruct.comp (tensorHom (tensorHom f₁ f₂) f₃) (Limits.BinaryFan.associatorOfLimitCone Y₁ Y₂ Y₃).hom = CategoryStruct.comp (Limits.BinaryFan.associatorOfLimitCone X₁ X₂ X₃).hom (tensorHom f₁ (tensorHom f₂ f₃))
          @[reducible, inline]

          Construct an instance of CartesianMonoidalCategory C given a terminal object and limit cones over arbitrary pairs of objects.

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            @[reducible, inline]

            Constructs an instance of CartesianMonoidalCategory C given the existence of finite products in C.

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              Constructs a morphism to the product given its two components.

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                @[simp]
                theorem CategoryTheory.CartesianMonoidalCategory.tensorHom_fst {C : Type u} [Category.{v, u} C] [CartesianMonoidalCategory C] {X₁ X₂ Y₁ Y₂ : C} (f : X₁ X₂) (g : Y₁ Y₂) :
                @[simp]
                theorem CategoryTheory.CartesianMonoidalCategory.tensorHom_fst_assoc {C : Type u} [Category.{v, u} C] [CartesianMonoidalCategory C] {X₁ X₂ Y₁ Y₂ : C} (f : X₁ X₂) (g : Y₁ Y₂) {Z : C} (h : X₂ Z) :
                @[simp]
                theorem CategoryTheory.CartesianMonoidalCategory.tensorHom_snd {C : Type u} [Category.{v, u} C] [CartesianMonoidalCategory C] {X₁ X₂ Y₁ Y₂ : C} (f : X₁ X₂) (g : Y₁ Y₂) :
                @[simp]
                theorem CategoryTheory.CartesianMonoidalCategory.tensorHom_snd_assoc {C : Type u} [Category.{v, u} C] [CartesianMonoidalCategory C] {X₁ X₂ Y₁ Y₂ : C} (f : X₁ X₂) (g : Y₁ Y₂) {Z : C} (h : Y₂ Z) :

                Universal property of the Cartesian product: Maps to X ⊗ Y correspond to pairs of maps to X and to Y.

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                  @[implicit_reducible]

                  CartesianMonoidalCategory implies BraidedCategory. This is not an instance to prevent diamonds.

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                    @[reducible, inline]

                    When C and D have chosen finite products and F : C ⥤ D is any functor, terminalComparison F is the unique map F (𝟙_ C) ⟶ 𝟙_ D.

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                      When C and D have chosen finite products and F : C ⥤ D is any functor, prodComparison F A B is the canonical comparison morphism from F (A ⊗ B) to F(A) ⊗ F(B).

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                        If the product comparison morphism is an iso, its inverse is natural in both argument.

                        If the product comparison morphism is an iso, its inverse is natural in both argument.

                        If the product comparison morphism is an iso, its inverse is natural in the right argument.

                        The product comparison morphism from F(A ⊗ -) to FA ⊗ F-, whose components are given by prodComparison.

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                          If F preserves the limit of the pair (A, B), then the binary fan given by (F.map fst A B, F.map (snd A B)) is a limit cone.

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                            If F preserves the limit of the pair (A, B), then prodComparison F A B is an isomorphism.

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                              The natural isomorphism F(A ⊗ -) ≅ FA ⊗ F-, provided each prodComparison F A B is an isomorphism (as B changes).

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                                The natural isomorphism of bifunctors F(- ⊗ -) ≅ F- ⊗ F-, provided each prodComparison F A B is an isomorphism.

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                                  In a cartesian monoidal category, tensorLeft X is naturally isomorphic prod.functor.obj X.

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                                    @[implicit_reducible]

                                    The restriction of a Cartesian-monoidal category along an object property that's closed under finite products is Cartesian-monoidal.

                                    @[implicit_reducible]

                                    Any functor between Cartesian-monoidal categories is oplax monoidal.

                                    This is not made an instance because it would create a diamond for the oplax monoidal structure on the identity and composition of functors.

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                                      Any functor between Cartesian-monoidal categories is oplax monoidal in a unique way.

                                      @[implicit_reducible]

                                      A finite-product-preserving functor between Cartesian monoidal categories is monoidal.

                                      This is not made an instance because it would create a diamond for the monoidal structure on the identity and composition of functors.

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                                        A functor between Cartesian monoidal categories is monoidal iff it preserves finite products.

                                        @[implicit_reducible]

                                        A finite-product-preserving functor between Cartesian monoidal categories is braided.

                                        This is not made an instance because it would create a diamond for the monoidal structure on the identity and composition of functors.

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