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2101.06959

TOPOLOGICAL MULTIPLE RECURRENCE OF WEAKLY MIXING MINIMAL SYSTEMS FOR GENERALIZED POLYNOMIALS

Ruifeng Zhang, Jianjie Zhao

correctmedium confidence
Category
Not specified
Journal tier
Specialist/Solid
Processed
Sep 28, 2025, 12:55 AM

Audit review

The paper’s Theorem 1.1 states exactly the target claim, including the moreover clause that N ∩ C(ε, g1, …, gt) is syndetic, and proves it via a dedicated PET-induction for generalized polynomials together with Nils Bohr0-set regularizations (Lemmas 2.12, 2.16, 2.17) and a degree-1 base case (Lemma 3.1; Theorems 3.2–3.3), culminating in Theorem 4.1 and the full result (Section 4) . In contrast, the model’s solution relies on two critical missteps: (i) an over-strong “regularization” that replaces integer-valued generalized polynomials by integral polynomials Qi,r on a thick window and residue class—this fails already for p(n)=⌈αn⌉ with irrational α; and (ii) importing measure-theoretic weak-mixing PET for integral polynomials from a presumed weakly mixing invariant measure, which is not supplied by topological weak mixing alone. The paper avoids both issues by a self-contained topological PET framework and Nils Bohr0-set machinery that guarantee the required syndeticity directly .

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The paper establishes a topological multiple-recurrence theorem along generalized polynomials for weakly mixing minimal systems, including a robust moreover clause on syndeticity within structured windows. The PET-induction adapted to generalized polynomials, together with Nils Bohr0-set tools, is technically sound and appropriately self-contained. Some steps (e.g., the generalization in Lemma 2.12) could be expanded for completeness, but the overall argument is correct and clear.