English

The Feichtinger conjecture for reproducing kernels in model subspaces

Complex Variables 2011-12-26 v1 Functional Analysis

Abstract

We obtain two results concerning the Feichtinger conjecture for systems of normalized reproducing kernels in the model subspace KΘ=H2ΘH2K_\Theta = H^2\ominus \Theta H^2 of the Hardy space H2H^2, where Θ\Theta is an inner function. First, we verify the Feichtinger conjecture for the kernels k~λn=kλn/kλn \tilde k_{\lambda_n} = k_{\lambda_n}/\|k_{\lambda_n}\| under the assumption that supnΘ(λn)<1\sup_n |\Theta(\lambda_n)|<1. Secondly, we prove the Feichtinger conjecture in the case where Θ\Theta is a one-component inner function, meaning that the set {z:Θ(z)<ε}\{z:|\Theta(z)|<\varepsilon\} is connected for some ε(0,1)\varepsilon\in(0,1).

Keywords

Cite

@article{arxiv.0906.2158,
  title  = {The Feichtinger conjecture for reproducing kernels in model subspaces},
  author = {Anton Baranov and Konstantin Dyakonov},
  journal= {arXiv preprint arXiv:0906.2158},
  year   = {2011}
}

Comments

14 pages

R2 v1 2026-06-21T13:12:27.988Z