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On the product property of the Carathéodory pseudodistance

José M. Isidro, Jean-Pierre Vigué (2000)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We prove that, for certain domains D , continuous product of domains D ω , the Carathéodory pseudodistance satisfies the following product property C D f , g = sup ω C D ω f ω , g ω

On the Rademacher maximal function

Mikko Kemppainen (2011)

Studia Mathematica

This paper studies a new maximal operator introduced by Hytönen, McIntosh and Portal in 2008 for functions taking values in a Banach space. The L p -boundedness of this operator depends on the range space; certain requirements on type and cotype are present for instance. The original Euclidean definition of the maximal function is generalized to σ-finite measure spaces with filtrations and the L p -boundedness is shown not to depend on the underlying measure space or the filtration. Martingale techniques...

On the range of convolution operators on non-quasianalytic ultradifferentiable functions

Jóse Bonet, Antonio Galbis, R. Meise (1997)

Studia Mathematica

Let ( ω ) ( Ω ) denote the non-quasianalytic class of Beurling type on an open set Ω in n . For μ ( ω ) ' ( n ) the surjectivity of the convolution operator T μ : ( ω ) ( Ω 1 ) ( ω ) ( Ω 2 ) is characterized by various conditions, e.g. in terms of a convexity property of the pair ( Ω 1 , Ω 2 ) and the existence of a fundamental solution for μ or equivalently by a slowly decreasing condition for the Fourier-Laplace transform of μ. Similar conditions characterize the surjectivity of a convolution operator S μ : D ω ' ( Ω 1 ) D ω ' ( Ω 2 ) between ultradistributions of Roumieu type whenever μ ω ' ( n ) . These...

On the regularity of bilinear maximal operator

Feng Liu, Guoru Wang (2023)

Czechoslovak Mathematical Journal

We study the regularity properties of bilinear maximal operator. Some new bounds and continuity for the above operators are established on the Sobolev spaces, Triebel-Lizorkin spaces and Besov spaces. In addition, the quasicontinuity and approximate differentiability of the bilinear maximal function are also obtained.

On the regularity of the one-sided Hardy-Littlewood maximal functions

Feng Liu, Suzhen Mao (2017)

Czechoslovak Mathematical Journal

In this paper we study the regularity properties of the one-dimensional one-sided Hardy-Littlewood maximal operators + and - . More precisely, we prove that + and - map W 1 , p ( ) W 1 , p ( ) with 1 < p < , boundedly and continuously. In addition, we show that the discrete versions M + and M - map BV ( ) BV ( ) boundedly and map l 1 ( ) BV ( ) continuously. Specially, we obtain the sharp variation inequalities of M + and M - , that is, Var ( M + ( f ) ) Var ( f ) and Var ( M - ( f ) ) Var ( f ) if f BV ( ) , where Var ( f ) is the total variation of f on and BV ( ) is the set of all functions f : satisfying Var ( f ) < .

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