An optimization approach to Koopman eigenfunctions for non-vanishing time intervals reveals inherent aliasing limits from sampling and shows irregular sampling can recover the true spectrum.
Tao,Topics in random matrix theory
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Koopman Representations for Non-Vanishing Time Intervals: An Optimization Approach and Sampling Effects
An optimization approach to Koopman eigenfunctions for non-vanishing time intervals reveals inherent aliasing limits from sampling and shows irregular sampling can recover the true spectrum.