Analysis in Banach Spaces : Volume I: Martingales and - download pdf or read online

By Tuomas Hytönen, Jan van Neerven, Mark Veraar, Lutz Weis

ISBN-10: 3319485199

ISBN-13: 9783319485195

ISBN-10: 3319485202

ISBN-13: 9783319485201

The current quantity develops the idea of integration in Banach areas, martingales and UMD areas, and culminates in a therapy of the Hilbert rework, Littlewood-Paley concept and the vector-valued Mihlin multiplier theorem.

Over the previous fifteen years, inspired by way of regularity difficulties in evolution equations, there was large development within the research of Banach space-valued capabilities and procedures.

The contents of this broad and strong toolbox were regularly scattered round in learn papers and lecture notes. gathering this varied physique of fabric right into a unified and available presentation fills a spot within the latest literature. The relevant viewers that we've got in brain includes researchers who want and use research in Banach areas as a device for learning difficulties in partial differential equations, harmonic research, and stochastic research. Self-contained and delivering whole proofs, this paintings is obtainable to graduate scholars and researchers with a history in sensible research or comparable areas.

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Extra info for Analysis in Banach Spaces : Volume I: Martingales and Littlewood-Paley Theory

Example text

Since g is strongly µ-measurable, an approximation argument shows that Aε contains a subset Bε of finite measure. By covering the range of g|Bε , which may be assumed to be separable, with countably many balls of radius ε, we find an x∗ ∈ X ∗ such that the set Bε,x∗ := Bε ∩ {s ∈ S : g(s) − x∗ < ε} has positive measure. Then x∗ 1−2ε. Let x ∈ X be a norm one vector such that x, x∗ x∗ −ε. With f := 1Bε,x∗ ⊗x/µ(Bε,x∗ ) we have f L1 (S;X) = 1 and ˆ 1 x, g dµ | f, φg | = µ(Bε,x∗ ) Bε,x∗ ˆ 1 x, x∗ dµ − ε x∗ − 2ε 1 − 4ε.

Moreover, ˆ ˆ 1A f dµ = f |A dµ|A . S A ´ Henceforth, both integrals will be denoted by A f dµ. 2 is the following result. 12 below. 3. Let f : S → X be Bochner integrable. If X0 is a closed subspace of X such that f (s) ∈ X0 for almost all ´s ∈ S, then f is Bochner integrable as an X0 -valued function. In particular, S f dµ ∈ X0 . 2 Integration 15 It is immediate from the definition of the Bochner integral that if f : S → X is Bochner integrable and T is a bounded linear operator from X into another Banach space Y , then T f : S → Y is Bochner integrable and ˆ ˆ T f dµ = T f dµ.

Consider F : P(Z+ ) → p , p ∈ (1, ∞], given by F (A) := −1 ej , where ej is the jth unit vector. It is easy to check that this is j∈A j p −1 an -valued measure. Its variation is given by F (A) = , so in j∈A j particular F (Z+ ) = ∞, and F does not have bounded variation. 6. If F has bounded variation, then F is a finite measure. 3 Duality of Bochner spaces 41 Proof. Let A1 , A2 , · · · ∈ A be disjoint, and let A be their union. We need to show that F (A) = n 1 F (An ). Consider the disjoint decomposition A = A1 ∪ · · · ∪ AN ∪ ( n N +1 AN ).

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Analysis in Banach Spaces : Volume I: Martingales and Littlewood-Paley Theory by Tuomas Hytönen, Jan van Neerven, Mark Veraar, Lutz Weis


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