Katznelson's negative answer conjecture for Bohr and topological recurrence
A set is a set of Bohr recurrence if it meets every Bohr set, and a set of topological recurrence if it is a set of topological recurrence in the dynamical sense.
Katznelson's conjecture. There is a set which is a set of Bohr recurrence but not a set of topological recurrence.
This is the negative answer to Katznelson's question. The paper presents it as an open question following its disproof of the higher-order analogue.
References
Primary source
Ryan Alweiss, “New Obstacles to Multiple Recurrence”, arXiv:2511.21680 (2025).
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