Documentation

Mathlib.CategoryTheory.Action.Monoidal

Induced monoidal structure on Action V G #

We show:

@[simp]
theorem Action.tensorHom_hom {V : Type u_1} [CategoryTheory.Category.{u_3, u_1} V] {G : Type u_2} [Monoid G] [CategoryTheory.MonoidalCategory V] {X₁✝ Y₁✝ X₂✝ Y₂✝ : Action V G} (f : X₁✝ Y₁✝) (g : X₂✝ Y₂✝) :

Given an object X isomorphic to the tensor unit of V, X equipped with the trivial action is isomorphic to the tensor unit of Action V G.

Equations
Instances For
    Equations
    • One or more equations did not get rendered due to their size.
    Equations
    • One or more equations did not get rendered due to their size.

    When V is braided the forgetful functor Action V G to V is braided.

    Equations

    The natural isomorphism of G-sets Gⁿ⁺¹ ≅ G × Gⁿ, where G acts by left multiplication on each factor.

    Equations
    Instances For
      @[simp]
      theorem Action.diagonalSuccIsoTensorDiagonal_hom_hom (G : Type u) [Monoid G] (n : ) (a✝ : (diagonal G (n + 1)).V) :
      (diagonalSuccIsoTensorDiagonal G n).hom.hom a✝ = (Fin.consEquiv fun (a : Fin (n + 1)) => G).symm a✝
      @[deprecated Action.diagonalSuccIsoTensorDiagonal (since := "2025-06-02")]

      Alias of Action.diagonalSuccIsoTensorDiagonal.


      The natural isomorphism of G-sets Gⁿ⁺¹ ≅ G × Gⁿ, where G acts by left multiplication on each factor.

      Equations
      Instances For

        Given X : Action (Type u) G for G a group, then G × X (with G acting as left multiplication on the first factor and by X.ρ on the second) is isomorphic as a G-set to G × X (with G acting as left multiplication on the first factor and trivially on the second). The isomorphism is given by (g, x) ↦ (g, g⁻¹ • x).

        Equations
        • One or more equations did not get rendered due to their size.
        Instances For
          @[simp]

          An isomorphism of G-sets Gⁿ⁺¹ ≅ G × Gⁿ, where G acts by left multiplication on Gⁿ⁺¹ and G but trivially on Gⁿ. The map sends (g₀, ..., gₙ) ↦ (g₀, (g₀⁻¹g₁, g₁⁻¹g₂, ..., gₙ₋₁⁻¹gₙ)), and the inverse is (g₀, (g₁, ..., gₙ)) ↦ (g₀, g₀g₁, g₀g₁g₂, ..., g₀g₁...gₙ).

          Equations
          • One or more equations did not get rendered due to their size.
          Instances For
            @[simp]
            theorem Action.diagonalSuccIsoTensorTrivial_hom_hom_apply {G : Type u} [Group G] {n : } (f : Fin (n + 1)G) :
            (diagonalSuccIsoTensorTrivial G n).hom.hom f = (f 0, fun (i : Fin n) => (f i.castSucc)⁻¹ * f i.succ)

            A lax monoidal functor induces a lax monoidal functor between the categories of G-actions within those categories.

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

            An oplax monoidal functor induces an oplax monoidal functor between the categories of G-actions within those categories.

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

            A monoidal functor induces a monoidal functor between the categories of G-actions within those categories.

            Equations