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arXiv · 2610.36403

Almost Periodicity Properties Arising From the Sodin-Yuditskii Theory

David Damanik·Long Li·Nicolae Strungaru
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Abstract

The Kotani-Last problem and the Deift conjecture are two well known statements, which both concern the almost periodicity properties of the functions under consideration, and which have both been disproved in their original formulation, which involves Bohr/Bochner almost periodicity. To contrast these disproofs, and to further elucidate the essence of these two challenging problems, we establish positive results regarding each of them by showing that Weyl almost periodicity can be deduced whenever the Sodin-Yuditskii setup can be implemented. The latter requires that the Schrödinger operator associated with the function in question has purely absolutely continuous spectral measure and a spectrum with finite total gap length and the Parreau-Widom property. We also show that the known examples for which Bohr/Bochner almost periodicity has been shown or suggested to fail in the context of the Deift conjecture are in fact Weyl almost periodic. As a result, an accordingly modified version of the Deift conjecture remains a tantalizing open problem.

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David Damanik, Long Li, Nicolae Strungaru. 2026-10-26. Almost Periodicity Properties Arising From the Sodin-Yuditskii Theory. https://arxiv.org/abs/2610.36403

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