Topologies of uniform convergence on the space of continuous linear maps #
In this file, we define the "topology of 𝔖-convergence" on E →L[𝕜] F, where
𝔖 : Set (Set E). It is the topology of uniform convergence on the elements of 𝔖.
Similarly to UniformOnFun, we define a type synonym UniformConvergenceCLM for
E →L[𝕜] F endowed with this topology.
The lemma UniformOnFun.continuousSMul_of_image_bounded tells us that this is a
vector space topology if the continuous linear image of any element of 𝔖 is bounded (in the sense
of Bornology.IsVonNBounded).
The most important examples for such topologies are:
- the topology of bounded convergence (also called the "strong topology" on the dual space),
when
𝔖is the set ofIsVonNBoundedsubsets. This coincides with the operator norm topology in the case ofNormedSpaces, and is declared as an instance onE →L[𝕜] F - the topology of pointwise convergence (also called "weak-* topology"
or "strong-operator topology" depending on the context), when
𝔖is the set of finite sets or the set of singletons. This is declared as an instance onPointwiseConvergenceCLM. - the topology of compact convergence, when
𝔖is the set of compact sets. This is declared as an instance onCompactConvergenceCLM.
Main definitions #
UniformConvergenceCLMis a type synonym forE →SL[σ] Fequipped with the𝔖-topology.UniformConvergenceCLM.instTopologicalSpaceis the topology mentioned above for an arbitrary𝔖.
Main statements #
UniformConvergenceCLM.instIsTopologicalAddGroupandUniformConvergenceCLM.instContinuousSMulshow that the strong topology makesE →L[𝕜] Fa topological vector space, with the assumptions on𝔖mentioned above.
References #
Tags #
uniform convergence, bounded convergence
𝔖-Topologies #
Given E and F two topological vector spaces and 𝔖 : Set (Set E), then
UniformConvergenceCLM σ F 𝔖 is a type synonym of E →SL[σ] F equipped with the "topology of
uniform convergence on the elements of 𝔖".
If the continuous linear image of any element of 𝔖 is bounded, this makes E →SL[σ] F a
topological vector space.
Equations
- UniformConvergenceCLM σ F x✝ = (E →SL[σ] F)
Instances For
Equations
- UniformConvergenceCLM.instFunLike σ F 𝔖 = { coe := UniformConvergenceCLM.instFunLike._aux_1 σ F 𝔖, coe_injective' := ⋯ }
Equations
The uniform structure associated with ContinuousLinearMap.strongTopology. We make sure
that this has nice definitional properties.
Equations
- UniformConvergenceCLM.instUniformSpace σ F 𝔖 = (UniformSpace.comap (⇑(UniformOnFun.ofFun 𝔖) ∘ DFunLike.coe) (UniformOnFun.uniformSpace E F 𝔖)).replaceTopology ⋯
Equations
- One or more equations did not get rendered due to their size.
Equations
- UniformConvergenceCLM.instDistribMulAction σ F M 𝔖 = { smul := UniformConvergenceCLM.instDistribMulAction._aux_1 σ F M 𝔖, mul_smul := ⋯, one_smul := ⋯, smul_zero := ⋯, smul_add := ⋯ }
Equations
- UniformConvergenceCLM.instModule σ F R 𝔖 = { toDistribMulAction := UniformConvergenceCLM.instDistribMulAction σ F R 𝔖, add_smul := ⋯, zero_smul := ⋯ }
A set S of continuous linear maps with topology of uniform convergence on sets s ∈ 𝔖
is von Neumann bounded iff for any s ∈ 𝔖,
the set {f x | (f ∈ S) (x ∈ s)} is von Neumann bounded.
Let 𝔖 be a family of bounded subsets of F, and B : E × F → G a bilinear map.
If B is (jointly) continuous, then it is 𝔖-hypocontinuous:
in curried form, it defines a continuous linear map E →L[𝕜] (UniformConvergenceCLM (.id 𝕜) G 𝔖).
Note that, in full generality, the converse is not true.
See also ContinuousLinearMap.continuous_of_continuous_uncurry.
The linear equivalence that maps a continuous linear map to the type copy endowed with the uniform convergence topology.
Equations
- ContinuousLinearMap.toUniformConvergenceCLM σ F 𝔖 = LinearEquiv.refl 𝕜₂ (E →SL[σ] F)
Instances For
Pre-composition by a fixed continuous linear map as a continuous linear map for the uniform convergence topology.
Equations
- ContinuousLinearMap.precompUniformConvergenceCLM G 𝔖 𝔗 L hL = { toFun := fun (f : UniformConvergenceCLM τ G 𝔗) => ContinuousLinearMap.comp f L, map_add' := ⋯, map_smul' := ⋯, cont := ⋯ }
Instances For
Alias of ContinuousLinearMap.precompUniformConvergenceCLM.
Pre-composition by a fixed continuous linear map as a continuous linear map for the uniform convergence topology.
Equations
Instances For
Alias of ContinuousLinearMap.precompUniformConvergenceCLM_apply.
Post-composition by a fixed continuous linear map as a continuous linear map for the uniform convergence topology.
Equations
- ContinuousLinearMap.postcompUniformConvergenceCLM 𝔖 L = { toFun := fun (f : UniformConvergenceCLM σ F 𝔖) => L.comp f, map_add' := ⋯, map_smul' := ⋯, cont := ⋯ }
Instances For
Alias of ContinuousLinearMap.postcompUniformConvergenceCLM.
Post-composition by a fixed continuous linear map as a continuous linear map for the uniform convergence topology.
Equations
Instances For
Alias of ContinuousLinearMap.postcompUniformConvergenceCLM_apply.