2 papers
math.NA2019
A variant of Schur's product theorem and its applications
Jan Vybíral
We show the following version of the Schur's product theorem. If is a positive semidefinite matrix with all entries on the diagona…
math.FA2012
The Characterization of Radial Subspaces of Besov- and Lizorkin-Triebel Spaces by Differences
Winfried Sickel, Leszek Skrzypczak, Jan Vybiral
We continue our earlier investigations of radial subspaces of Besov and Lizorkin-Triebel spaces on . This time we study characterizations of these subspaces by differences.