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On interpolation of operator, which is the sum of weighted Hardy-Littlewood and Cesaro mean operators
Author(s) -
B.I. Peleshenko
Publication year - 2019
Publication title -
researches in mathematics
Language(s) - English
Resource type - Journals
eISSN - 2664-5009
pISSN - 2664-4991
DOI - 10.15421/241905
Subject(s) - multiplicative function , combinatorics , hardy space , mathematics , lambda , lorentz transformation , operator (biology) , maximal operator , physics , discrete mathematics , mathematical analysis , bounded function , quantum mechanics , biochemistry , chemistry , repressor , transcription factor , gene
It is proved that operators, which are the sum of weighted Hardy-Littlewood $\int\limits_0^1 f(xt) \psi(t) dt$ and Cesaro $\int\limits_0^1 f(\frac{x}{t}) t^{-n} \psi(t) dt$ mean operators, are limited on Lorentz spaces $\Lambda_{\varphi, a} (\mathbb{R})$, if the functions $f(x) \in \Lambda_{\varphi, a}(\mathbb{R})$ satisfy the condition $|f(-x)| = |f(x)|$, $x > 0$, for such non-increasing semi-multiplicative functions $\psi$, for which the next conditions are satisfied: $\frac{M_1}{\psi(t)} \leqslant \psi(\frac{1}{t}) \leqslant \frac{M_2}{\psi(t)}$, for all $0 0$.