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2506.19667

Infinite polynomial patterns in large subsets of the rational numbers

Ethan Ackelsberg

correctmedium confidence
Category
Not specified
Journal tier
Strong Field
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper proves the two target theorems for Q via a careful ergodic/topological argument, including new tools for Q-actions, and documents why analogous integer statements fail. The candidate solution relies on a “polynomial central sets theorem” to force the infinite pair-pattern inside a central translate, but key steps are unsubstantiated or false: (i) it incorrectly upgrades a piecewise syndetic cover to claim an entire translate A−t is central; (ii) it invokes an imprecise VIP/central-sets principle that does not justify realizing the all-pairs constraint {b_i, P(b_i)+b_j: i<j} while simultaneously ensuring b_i ∈ C; and (iii) if its method worked, it would also (incorrectly) yield the integer case, contradicting results surveyed and proved in the paper. The paper’s proofs are coherent and complete; the model’s proof is not.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The paper proves sharp new results distinguishing the rational numbers from the integers for infinite polynomial sumset patterns, answering a question posed in the literature. The argument develops and applies new tools for Q-actions (a polynomial Wiener–Wintner theorem and an Abramov structure theorem), and the exposition clearly separates the dynamical rephrasing from the technical core. A few places could benefit from expanded explanations (e.g., intuition for progressive measures and a brief comparison with central-sets methods), but the mathematics appears correct, novel, and significant.