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arXiv · 2204.02096

On $k$-universal quadratic lattices over unramified dyadic local fields

Zilong He·Yong Hu
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Abstract

Let $k$ be a positive integer and let $F$ be a finite unramified extension of $\mathbb{Q}_2$ with ring of integers $\mathcal{O}_F$. An integral (resp. classic) quadratic form over $\mathcal{O}_F$ is called $k$-universal (resp. classically $k$-universal) if it represents all integral (resp. classic) quadratic forms of dimension $k$. In this paper, we provide a complete classification of $k$-universal and classically $k$-universal quadratic forms over $\mathcal{O}_F$. The results are stated in terms of the fundamental invariants associated to Jordan splittings of quadratic lattices.

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Zilong He, Yong Hu. 2022-04-05. On $k$-universal quadratic lattices over unramified dyadic local fields. https://doi.org/10.1016/j.jpaa.2023.107334

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