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Bounded linear maps commute with Bochner integration
Statement
Let be Banach spaces, let be bounded and linear, and let be Bochner integrable. Then is Bochner integrable and, for every measurable ,
Facts & Assumptions
A bounded linear operator satisfies for some finite (A bounded linear operator between normed spaces).
A Bochner integral is the norm limit of integrals of an -approximating simple sequence (Bochner-integrable function).
The Banach-valued simple integral is linear and representation-independent (The Banach-valued simple integral is well defined).
Proof
Given: as in the Statement.
Restrict a defining approximation to the measurable set. Choose integrable simple with . Then is an integrable -valued simple function: every nonzero level is a finite union of level sets of .
Prove Bochner integrability after applying . By [L1], . Thus [L2] makes Bochner integrable.
Commute with the defining limit. [L1, L2, L3, step 1.1, step 2.1] For each simple , finite linearity in [L3] gives . Boundedness makes norm-continuous, so taking limits in this equality and using [L2] proves the displayed identity. If , , or , both sides are explicitly zero.
Depends on
Used by
- Parseval and Fourier inversion for compact groups Corollary
- Spatial smoothing of forcing separated from the observation time Corollary
- Infinitely many modes admit inequivalent irreducible regular Weyl representations Counterexample
- Partially one-homogeneous signed measure projection Definition
- Relaxed objective for a partially one-homogeneous projection Definition
- The Duhamel heat potential Definition
- A trace-class Gaussian with full support and a proper Cameron–Martin space Example
- Spectral projection of an isolated eigenvalue agrees with the riesz projection Example
- The right-translation semigroup on Lp has the weak derivative as generator Example
- A positive rank-one Haar average is a nonzero compact intertwiner Lemma
- A system of imprimitivity integrates to a nondegenerate representation of the transformation algebra Lemma
- A weak two-homogeneous projection limit is stationary on its support Lemma
- Characters of the L1 algebra of an abelian group Lemma
- Feature and energy identities for homogeneous projections Lemma
- Feature energy is W2-continuous on a common cutoff Lemma
- Finite partition energy yields Hilbert-valued AC2 paths Lemma
- First variation and optimality over nonnegative measures Lemma
- Independent centered Hilbert-valued elements have zero expected inner product Lemma
- Integrated pressure recovery and MINI pressure-primitive convergence Lemma
- Laplace resolvents of a unitary group Lemma
- Laplace uniqueness identifies two exponentially bounded semigroups Lemma
- Long-run covariance of an L2-m-approximable shift is trace class Lemma
- Nonzero multiplicative functionals on L¹ of an LCA group are Fourier evaluations Lemma
- Partial feature flows have exact energy and weight-moment identities Lemma
- Partial one-homogeneous energy is continuous under W2 convergence Lemma
- Recovering a unitary group representation from a nondegenerate L one representation Lemma
- RNP is invariant under Banach-space isomorphism Lemma
- RNP is separably determined Lemma
- Signwise first-variation conditions minimize the relaxed objective Lemma
- Smooth and K-finite vectors are dense and stable under the derived action Lemma
- Spectral measure of a unitary representation of an abelian group, covariance, and ergodicity Lemma
- The Gaussian Weyl average is a rank-one projection Lemma
- The Hilbert lift induces the localized Wasserstein continuity equation Lemma
- The L1 action of a strongly continuous unitary representation Lemma
- The localized lifted feature energy is semiconvex Lemma
- The weighted discrete-series space is a Hilbert space with K-type basis Lemma
- Time derivatives of fixed and differentiable comparison projections Lemma
- Time integrals of semigroup orbits lie in the generator domain Lemma
- Time mollification preserves the evolution-space derivative Lemma
- Weighted Hilbert Gaussian series and prior regularity Lemma
…and 10 more results.
Dependency tree · two levels
10 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.
Sources
- Gerald Teschl, Topics in Real and Functional Analysis (standard reference, not scraped)