show · lf.residue_field_degree all knowls · up · search:

If $K$ is a finite extension of $\mathbb{Q}_p$, then let $\mathcal{O}_K$ denote its ring of integers. Let $P$ be its unique maximal ideal. Then $\mathcal{O}_K/P$ is a field which is a finite degree extension of $\mathbb{Z}_p/p\mathbb{Z}_p = \mathbb{F}_p$. The residue field degree is the degree of this extension: $f = [\mathcal{O}_K/P : \mathbb{F}_p]$.

Authors:
Knowl status:
  • Review status: reviewed
  • Last edited by John Cremona on 2018-05-23 15:02:11
Referred to by:
History: (expand/hide all)