English

Universal frame set for rational functions

Functional Analysis 2025-10-31 v1

Abstract

Let gL2(R)g \in L^2(\mathbb{R}) be a rational function of degree MM, i.e. there exist polynomials P,QP, Q such that g=PQg = {{P} \over {Q}} and deg(P)<deg(Q)Mdeg(P) < deg(Q) \leq M. We prove that for any ε>0\varepsilon>0 and any MNM \in \mathbb{N} there exists universal set ΛR\Lambda \subset \mathbb{R} of density less than 1+ε1+\varepsilon such that the system {e2πiλtg(tn) ⁣:(λ,n)Λ×Z}\left\{ e^{2\pi i \lambda t } g(t-n) \colon (\lambda, n) \in \Lambda \times \mathbb{Z} \right\} is a frame in L2(R)L^2(\mathbb{R}) for any well-behaved rational function gg.

Keywords

Cite

@article{arxiv.2510.25930,
  title  = {Universal frame set for rational functions},
  author = {Andrei V. Semenov},
  journal= {arXiv preprint arXiv:2510.25930},
  year   = {2025}
}

Comments

18 pages

R2 v1 2026-07-01T07:12:46.504Z