English

Minimal rank of primitively $n$-universal integral quadratic forms over local rings

Number Theory 2024-12-20 v1

Abstract

Let FF be a local field and let RR be its ring of integers. For a positive integer nn, an integral quadratic form defined over RR is called primitively nn-universal if it primitively represents all quadratic forms of rank nn. It was proved in arXiv:2005.11268 that the minimal rank of primitively 11-universal quadratic forms over the pp-adic integer ring Zp\mathbb{Z}_p is 22 if pp is odd, and 33 otherwise. In this article, we completely determine the minimal rank of primitively nn-universal quadratic forms over RR for any positive integer nn and any local ring RR such that 22 is a unit or a prime.

Keywords

Cite

@article{arxiv.2412.14709,
  title  = {Minimal rank of primitively $n$-universal integral quadratic forms over local rings},
  author = {Byeong-Kweon Oh and Jongheun Yoon},
  journal= {arXiv preprint arXiv:2412.14709},
  year   = {2024}
}