English

Multiplicative dependence in the denominators of points of elliptic curves

Number Theory 2025-12-23 v2

Abstract

Let E1,,EsE_1, \ldots, E_s be ss, not necessary distinct, elliptic curves over Q\mathbb{Q}. We give upper bounds on the frequency of ss-tuples of points in E1(Q)××Es(Q)E_1(\mathbb{Q})\times \ldots \times E_s(\mathbb{Q}) whose denominators or xx-coordinates are multiplicatively dependent. More precisely, we give such bounds in two scenarios: one in which we fix ss non-torsion Q\mathbb{Q}-rational points PiEi(Q)P_i \in E_i(\mathbb{Q}) and arbitrary Q\mathbb{Q}-rational points QiEi(Q)Q_i \in E_i(\mathbb{Q}), i=1,,si =1, \ldots, s, and we count ss-tuples (n1P1+Q1,,nsPs+Qs)E1(Q)××Es(Q) (n_1P_1+Q_1,\ldots, n_sP_s+Q_s) \in E_1(\mathbb{Q}) \times \ldots \times E_s(\mathbb{Q}) with n1,,nsn_1, \ldots, n_s in an arbitrary interval of length NN, and the second in which we count points (P1,,Ps)E1(Q)××Es(Q)(P_1,\ldots,P_s) \in E_1(\mathbb{Q}) \times \ldots \times E_s(\mathbb{Q}) of bounded canonical height.

Keywords

Cite

@article{arxiv.2510.05462,
  title  = {Multiplicative dependence in the denominators of points of elliptic curves},
  author = {Attila Bérczes and Subham Bhakta and Lajos Hajdu and Alina Ostafe and Igor E. Shparlinski},
  journal= {arXiv preprint arXiv:2510.05462},
  year   = {2025}
}