Fractional, Maximal and Singular Operators in Variable Exponent Lorentz Spaces

Details Fractional, Maximal and Singular Operators in Variable Exponent Lorentz Spaces Fractional, Maximal and Singular Operators in Variable Exponent Lorentz Spaces

2008-05-06

arxiv.org/abs/0805.0693v1

Mathematics

Functional Analysis

13 pages

Scientific paper

We introduce the Lorentz space $\mathcal{L}^{p(\cdot), q(\cdot)}$ with variable exponents $p(t),q(t)$ and prove the boundedness of singular integral and fractional type operators, and corresponding ergodic operators in these spaces. The main goal of the paper is to show that the boundedness of these operators in the spaces $\mathcal{L}^{p(\cdot), q(\cdot)}$ is possible without the local log-condition on the exponents, typical for the variable exponent Lebesgue spaces; instead the exponents $p(s)$ and $q(s)$ should only satisfy decay conditions of log-type as $s\to 0$ and $s\to\infty$. To prove this, we base ourselves on the recent progress in the problem of the validity of Hardy inequalities in variable exponent Lebesgue spaces.

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