English

Polynomial extension of Van der Waerden's Theorem near zero

Combinatorics 2025-08-13 v1

Abstract

Let SS be a dense subring of the real numbers. In this paper we prove a polynomial version of Van der Waerden's theorem near zero. In fact, we prove that if p1,,pmZ[x]p_1,\ldots,p_m \in \mathbb{Z}[x] are polynomials such that pi(0)=0p_i(0) = 0 and there exists δ>0\delta > 0 such that pi(x)>0p_i(x) > 0 for every x(0,δ)x \in (0,\delta) and for every i=1,,mi=1,\ldots , m. Then for any finite partition C\mathcal{C} of S(0,1) S\cap(0,1) and every sequence f:NS(0,1)f:\mathbb{N}\to S\cap(0,1) satisfying n=1f(n)<\sum_{n=1}^\infty f(n)<\infty, there exist a cell CCC \in \mathcal{C}, an element aSa \in S, and FPf(N)F \in P_f(\mathbb{N}) such that {a+pi(tFf(t)):i=1,2,,m}C. \{ a + p_i(\sum_{t \in F} f(t)) : i = 1,2,\ldots,m \} \subseteq C.

Keywords

Cite

@article{arxiv.2508.08675,
  title  = {Polynomial extension of Van der Waerden's Theorem near zero},
  author = {Ghadir Ghadimi and Mohammad Akbari Tootkaboni},
  journal= {arXiv preprint arXiv:2508.08675},
  year   = {2025}
}