Induced monoidal structure on Action V G #
We show:
- When
Vis monoidal, braided, or symmetric, so isAction V G.
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.
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When V is braided the forgetful functor Action V G to V is braided.
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- Action.instBraidedForget V G = { toMonoidal := Action.instMonoidalForget V G, braided := ⋯ }
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Upgrading the functor Action V G ⥤ (SingleObj G ⥤ V) to a monoidal functor.
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Upgrading the functor (SingleObj G ⥤ V) ⥤ Action V G to a monoidal functor.
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If V is right rigid, so is Action V G.
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If V is left rigid, so is Action V G.
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If V is rigid, so is Action V G.
The natural isomorphism of G-sets Gⁿ⁺¹ ≅ G × Gⁿ, where G acts by left multiplication on
each factor.
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- Action.diagonalSuccIsoTensorDiagonal G n = Action.mkIso (Fin.consEquiv fun (a : Fin (n + 1)) => G).symm.toIso ⋯
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Alias of Action.diagonalSuccIsoTensorDiagonal.
The natural isomorphism of G-sets Gⁿ⁺¹ ≅ G × Gⁿ, where G acts by left multiplication on
each factor.
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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).
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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).
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A lax monoidal functor induces a lax monoidal functor between
the categories of G-actions within those categories.
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An oplax monoidal functor induces an oplax monoidal functor between
the categories of G-actions within those categories.
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A monoidal functor induces a monoidal functor between
the categories of G-actions within those categories.
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- F.instMonoidalActionMapAction = { toLaxMonoidal := F.instLaxMonoidalActionMapAction, toOplaxMonoidal := F.instOplaxMonoidalActionMapAction, ε_η := ⋯, η_ε := ⋯, μ_δ := ⋯, δ_μ := ⋯ }