Bergelson’s partition-regularity question for nice recurrence
Bergelson’s partition-regularity question for nice recurrence
A set is called a set of nice recurrence if, for every measure-preserving system , every measurable set , and every , there exists such that . The problem asks whether, for every set of nice recurrence and every finite coloring , there exists a color such that the monochromatic set is itself a set of nice recurrence.
Progress summary
A new preprint claims that every finite coloring contains the required same-colored set, but the claim has not yet been independently verified.
The question asks whether the required monochromatic nice-recurrence subset exists for every finite coloring.
August 2026 preprint claim
A preprint titled “Sets of nice recurrence are partition regular” claims to establish the required subset for every finite coloring, which would settle the question. The result remains an unverified preprint claim.
Current status (as of August 2026): A preprint claims the question is solved for every finite coloring, but independent verification is not recorded.
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