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Bochner integral norm inequality
Statement
If is Bochner integrable, then for every measurable ,
Facts & Assumptions
For a strongly measurable function, Bochner integrability is equivalent to finite integrability of its norm. Every Bochner-integrable function has a defining integrable-simple approximation converging in (Bochner integrability criterion).
The inequality holds for integrable Banach-valued simple functions (The Banach-valued simple integral is well defined).
The nonnegative integral is additive (Additivity of the nonnegative Lebesgue integral) and monotone (Monotonicity and nonnegative homogeneity of the nonnegative integral).
Proof
Given: A Bochner-integrable and a measurable set .
Restrict a defining simple approximation to . [given, L1, choose] Choose integrable simple with . Replacing each by shows from [L1] that is Bochner integrable and that its integral is the norm limit of .
Bound each simple integral. [L2, L3, step 1.1] The triangle inequality and [L2] give . Since , [L3] yields .
Pass to the limit and conclude. [step 1.1, step 2.1] Let in step 2.1. Norm continuity and step 1.1 identify the left limit with , while the last term tends to zero. This proves the inequality, including and .
Depends on
Used by
- A semigroup with unbounded generator is not norm continuous at zero Corollary
- Abstract parabolic smoothing for mild solutions Corollary
- Parseval and Fourier inversion for compact groups Corollary
- Resolvent power estimates for semigroup generators Corollary
- Spatial smoothing of forcing separated from the observation time Corollary
- Infinitely many modes admit inequivalent irreducible regular Weyl representations Counterexample
- The translation semigroup is not analytic Counterexample
- Compact-group isotypic projection Definition
- The Duhamel heat potential Definition
- Bochner integral of a countably valued function Example
- A Bochner density defines an absolutely continuous vector measure Lemma
- A Lipschitz Fréchet derivative gives a quadratic linearization remainder Lemma
- 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
- Analytic Duhamel cancellation removes the generator singularity Lemma
- Anchored IRGNM error identity and fixed-reference residual inequality Lemma
- Average convergence for a continuous Banach-valued function Lemma
- Characters of the L1 algebra of an abelian group Lemma
- Fundamental theorem of calculus for Banach-valued continuous curves Lemma
- Integrated pressure recovery and MINI pressure-primitive convergence Lemma
- Laplace resolvents of a unitary group Lemma
- Long-run covariance of an L2-m-approximable shift is trace class Lemma
- Nondentability produces a vector measure without density Lemma
- Partial one-homogeneous energy is continuous under W2 convergence Lemma
- Primitive and Cauchy theorem for Banach-valued holomorphic maps on star-shaped domains Lemma
- Recovering a unitary group representation from a nondegenerate L one representation Lemma
- Smooth and K-finite vectors are dense and stable under the derived action Lemma
- Smooth mollifiers approximate Bochner L² functions Lemma
- Spectral measure of a unitary representation of an abelian group, covariance, and ergodicity Lemma
- Taylor expansion with integral remainder for Banach-valued curves Lemma
- The Dunford contour construction satisfies the semigroup law and strong continuity at the vertex Lemma
- The Dunford contour integral defines a bounded holomorphic family on the sector Lemma
- The Gaussian Weyl average is a rank-one projection Lemma
- The generator of a unitary group is closed and skew-adjoint Lemma
- The L1 action of a strongly continuous unitary representation Lemma
- The variation-of-constants integral is continuous for integrable forcing Lemma
- Time integrals of semigroup orbits lie in the generator domain Lemma
- Time mollification preserves the evolution-space derivative Lemma
- Time translations and mollification in Bochner Lp Lemma
- Weighted overlapping-block moment and covariance limits Lemma
…and 16 more results.
Dependency tree · two levels
16 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)