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
- arXiv Links
- Abstract ↗PDF ↗
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.