On the function spaces of general weights

TL;DR

This paper characterizes certain Besov and Triebel-Lizorkin function spaces with general weights, establishing conditions for their equivalence and identifying when different weighted spaces coincide.

Contribution

It provides a characterization of weighted Besov and Triebel-Lizorkin spaces for q=∞ and proves equivalence of these spaces under specific assumptions on the weights.

Findings

Characterization of Besov and Triebel-Lizorkin spaces for q=∞

Equivalence of weighted spaces under certain conditions

Necessary and sufficient conditions for space coincidence

Abstract

The aim of this paper is twofold. Firstly, we chatacterize the Besov spaces $\dot{B}_{p,q}(\mathbb{R}^{n},\{t_{k}\})$ and the Triebel-Lizorkin spaces $\dot{F}_{p,q}(\mathbb{R}^{n},\{t_{k}\})$ for $q=\infty $. Secondly, under some suitable assumptions on the $p$-admissible weight sequence $\{t_{k}\}$, we prove that \begin{equation*} \dot{A}_{p,q}(\mathbb{R}^{n},\{t_{k}\})=\dot{A}_{p,q}(\mathbb{R} ^{n},t_{j}),\quad j\in \mathbb{Z}, \end{equation*} in the sense of equivalent quasi-norms, with $\dot{A}$ $\in \{\dot{B},\dot{F}\}$. Moreover, we find a necessary and sufficient conditions for the coincidence of the spaces $\dot{A}_{p,q}(\mathbb{R}^{n},t_{i}),i\in \{1,2\}$.