Riesz bases of exponentials and the Bohr topology
英文摘要：
We provide a necessary and sufficient condition to ensure that a multi-tile $Ω$ of $R^d$ of positive measure (but not necessarily bounded) admits a structured Riesz basis of exponentials for $ L^{2}(Ω)$. New examples are given and this characterization is generalized to abstract locally compact abelian groups.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
