@article{Lee2024, 
author = {Dae Gwan Lee},
title = {Unions of exponential Riesz bases},
year = {2024},
journal = {AIMS Mathematics},
volume = {9},
number = {9},
pages = {23890-23908},
keywords = {complex exponentials, Riesz bases, frames, spectrum, domain, union},
url = {https://www.sciopen.com/article/10.3934/math.20241161},
doi = {10.3934/math.20241161},
abstract = {We have developed new methods for constructing exponential Riesz bases by combining existing ones. These methods involve taking unions of frequency sets and domains respectively, offering easier construction compared to known techniques. Along with examples illustrating our methods, we also provide several examples that highlight the intricate nature of exponential Riesz bases.}
}