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math.CA2025
On the lower Riesz basis bound of exponential systems over an interval
Thibaud Alemany, Shahaf Nitzan
We revisit Pavlov's characterization for Riesz bases of exponentials and study the corresponding lower Riesz basis bounds. In particular, this approach allows us to improve on know…
math.CA2024
On uniformly minimal and 'uniformly complete' exponential systems
Shahaf Nitzan
A.Olevskii and A.Ulanovskii obtained a scale of density results, which correspond to how well an exponential system approximates a uniformly minimal system over a compact set. We e…