Painless construction of unconditional bases for anisotropic modulation and Triebel-Lizorkin type spaces
Year: 2025
Type: article
Abstract: We construct smooth localized orthonormal bases compatible with anisotropic Triebel-Lizorkin and Besov type spaces on R d . The construction is based on tensor products of so-called univariate brushlet functions that are based on local trigonometric bases in the frequency domain, and the construction is painless in the sense that all parameters for the construction are explicitly specified. It is shown that the associated decomposition system form unconditional bases for the full family of Triebel-Lizorkin and Besov type spaces, including for the so-called α -modulation and α -Triebel-Lizorkin spaces. In the second part of the paper we study nonlinear m -term approximation with the constructed bases, where direct Jackson and Bernstein inequalities for m -term approximation with the tensor brushlet system in α -modulation and α -Triebel-Lizorkin spaces are derived. The inverse Bernstein estimates rely heavily on the fact that the constructed system is non-redundant.
Author: Morten Nielsen
Institution: Aalborg University
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,150
OpenAlex ID: W4416795997