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Keywords:
vector-valued space; $L^p(\ell ^1)$ capacity; vector-valued extension; boundedness
Summary:
This paper is devoted to the study of a class of vector-valued convolution operators. A fundamental problem in this context is to characterize the nonnegative measures $\mu $ for which such operators are bounded from $L^p(\ell ^1)$ to $L^q(\ell ^1; \mu )$. Inspired by classical capacity theory, we introduce a novel notion of $L^p(\ell ^1)$ capacity specifically adapted to the vector-valued setting. By developing this capacity approach, we establish complete necessary and sufficient conditions on the measure $\mu $ for the boundedness of the operators. Our results provide a unified characterization that covers both cases $p \leq q$ and $q < p$. The findings yield a powerful tool for analyzing mapping properties of vector-valued operators in weighted spaces.
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