WFRF:(Johansson Lars Erik)
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Inequalities for moduli of continuity and rearrangements
- Johansson, Hans (author)
- Maligranda, Lech (author)
-
- Persson, Lars-Erik (author)
- Luleå tekniska universitet,Matematiska vetenskaper
- (creator_code:org_t)
- Elsevier, 1991
- 1991
- English.
- In: Conference on Approximation Theory, in Kecskemét, August 6 to 11, 1990. - : Elsevier. - 0444986952 ; , s. 412-423
- Conference paper (peer-reviewed)
Abstract
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- In this paper we consider measurable functions f from a symmetric space X on [0,1]. We prove some inequalities relating the behavior of the nonincreasing rearrangement f* and the (generalized) modulus of continuity ωX (t,f). In particular, we generalize, complement and unify some previous result by Brudnyi, Garsia and Rodemich, Milman, Osvald, Storozhenko, and Wik. We note that these inequalities have direct applications, e.g. in the theory of imbedding of symmetric spaces and Besov (Lipschitz) spaces, Fourier analysis and the theory of stochastic processes. This paper is organized in the following way: In Section 1 we give some basic definitions and other preliminaries. In Section 2 we present a generalization of the Storozhenko inequality to the case of symmetric spaces thereby sharpening a previous result of Milman. We also include a generalization of the Garsia-Rodemich inequality to these spaces. In Section 3 we present and prove the Brudnyi-Osvald-Wik inequality for the case of symmetric spaces.
Subject headings
- NATURVETENSKAP -- Matematik -- Matematisk analys (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Mathematical Analysis (hsv//eng)
Keyword
- Mathematics
- Matematik
Publication and Content Type
- ref (subject category)
- kon (subject category)
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