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arXiv · 2402.15947

Hyper-algebraic invariants of $p$-adic algebraic numbers

Shanwen Wang·Yijun Yuan
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Abstract

Let $p\geq 3$ be a prime. The hyper-algebraic elements in the $p$-adic Mal'cev-Neumann field $\mathbb{L}_p$ form an algebraically closed subfield $\mathbb{L}_p^{\operatorname{ha}}$. In this article, we clarify the relations among the fields $\mathbb{L}_p^{\operatorname{ha}}$, $\overline{\mathbb{Q}}_p$ and $\mathbb{C}_p$. We introduce two arithmetic invariants (hyper-tame index and hyper-inertia index) of hyper-algebraic elements and study the relation between these invariants and classical arithmetic invariants of $p$-adic algebraic numbers. Finally, we give a criterion for hyper-algebraic elements to be tamely ramified over $\mathbb{Q}_p$.

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Shanwen Wang, Yijun Yuan. 2026-06-02. Hyper-algebraic invariants of $p$-adic algebraic numbers. https://arxiv.org/abs/2402.15947

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