Matrix-Weighted Besov-Type and Triebel--Lizorkin-Type Spaces II: Sharp Boundedness of Almost Diagonal Operators

Fan Bu, Tuomas Hytönen, Dachun Yang, Wen Yuan

Published 2023-12-21Version 1

This article is the second one of three successive articles of the authors on the matrix-weighted Besov-type and Triebel--Lizorkin-type spaces. In this article, the authors obtain the sharp boundedness of almost diagonal operators on matrix-weighted Besov-type and Triebel--Lizorkin-type sequence spaces. These results not only possess broad generality but also improve most cases of existing almost diagonal conditions of matrix-weighted Besov and Triebel--Lizorkin sequence spaces and even also weighted Besov-type and Triebel--Lizorkin-type sequence spaces into sharp ones via using $A_p$-dimensions of matrix weights and their elaborate properties in terms of reducing operators obtained by the same authors in the first article of this series.