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2104.02358

A DYNAMICAL ARGUMENT FOR A RAMSEY PROPERTY

Enhui Shi, Hui Xu

wrongmedium confidence
Category
math.DS
Journal tier
Note/Short/Other
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper defines the opposite-Ramsey number r(p,q) as the largest k such that every p-edge-coloring of K_q contains a monochromatic K_k, and asserts there exists q with q(log n) super-polynomial and liminf_{n→∞} r((2n+1)^2, q(n)) < ∞ (Theorem 2.1) . The model observes that for fixed k≥3, the multicolor Ramsey number R_p(k) is polynomial in p up to a logarithmic factor (e.g., R_p(3)=Θ(p log p)), so for p=(2n+1)^2 one has R_p(k) ≤ poly(n)·log n. Since q(log n) being super-polynomial implies q(n) eventually dominates every polynomial in n, one obtains q(n) > R_{(2n+1)^2}(k) for all large n and every fixed k, hence r((2n+1)^2, q(n)) ≥ k for all large n and thus liminf r((2n+1)^2, q(n)) = ∞. This directly contradicts the paper’s main claim. The paper’s dynamical argument constructs, for each n, a specific (2n+1)^2-coloring of K_{S(α^{-n})}, then argues by contradiction that if liminf r→∞, one would obtain arbitrarily large finite 1/(4α)-separated subsets of a compact space, which is impossible; hence the liminf must be finite . However, the combinatorial upper bounds force that very liminf to be infinite for any q with q(log n) super-polynomial, so the theorem cannot hold. Additionally, there is an apparent miscitation: the text attributes the existence of an expansive Z^2-action on T^∞ to reference [2], which (as listed) concerns nonexistence on graphs, not such a construction .

Referee report (LaTeX)

\textbf{Recommendation:} reject

\textbf{Journal Tier:} note/short/other

\textbf{Justification:}

The paper’s principal theorem contradicts standard multicolour Ramsey bounds that make R\_p(K\_k) polynomial in p for fixed k (up to logs), which forces r((2n+1)\^2, q(n)) to diverge whenever q(log n) is super-polynomial. The dynamical compactness contradiction does not reconcile with these bounds. A likely miscitation further undermines confidence in the construction. In its current form, the main claim is untenable.