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Mathlib.CategoryTheory.Adjunction.Whiskering

Given categories C D E, functors F : D ⥤ E and G : E ⥤ D with an adjunction F ⊣ G, we provide the induced adjunction between the functor categories C ⥤ D and C ⥤ E, and the functor categories E ⥤ C and D ⥤ C.

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def CategoryTheory.Adjunction.whiskerRight (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) :
(Functor.whiskeringRight C D E).obj F ⊣ (Functor.whiskeringRight C E D).obj G

Given an adjunction F ⊣ G, this provides the natural adjunction (whiskeringRight C _ _).obj F ⊣ (whiskeringRight C _ _).obj G.

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    @[simp]
    theorem CategoryTheory.Adjunction.whiskerRight_counit_app_app (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) (X : Functor C E) (X✝ : C) :
    ((Adjunction.whiskerRight C adj).counit.app X).app X✝ = adj.counit.app (X.obj X✝)
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    @[simp]
    theorem CategoryTheory.Adjunction.whiskerRight_unit_app_app (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) (X : Functor C D) (X✝ : C) :
    ((Adjunction.whiskerRight C adj).unit.app X).app X✝ = adj.unit.app (X.obj X✝)
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    def CategoryTheory.Adjunction.whiskerLeft (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) :
    (Functor.whiskeringLeft E D C).obj G ⊣ (Functor.whiskeringLeft D E C).obj F

    Given an adjunction F ⊣ G, this provides the natural adjunction (whiskeringLeft _ _ C).obj G ⊣ (whiskeringLeft _ _ C).obj F.

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      @[simp]
      theorem CategoryTheory.Adjunction.whiskerLeft_unit_app_app (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) (X : Functor D C) (X✝ : D) :
      ((Adjunction.whiskerLeft C adj).unit.app X).app X✝ = X.map (adj.unit.app X✝)
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      @[simp]
      theorem CategoryTheory.Adjunction.whiskerLeft_counit_app_app (C : Type u_1) {D : Type u_2} {E : Type u_3} [Category.{u_4, u_1} C] [Category.{u_5, u_2} D] [Category.{u_6, u_3} E] {F : Functor D E} {G : Functor E D} (adj : F ⊣ G) (X : Functor E C) (X✝ : E) :
      ((Adjunction.whiskerLeft C adj).counit.app X).app X✝ = X.map (adj.counit.app X✝)