Normalized Indexing for Ramification Subgroups
Number Theory
2025-09-19 v1
Abstract
This expository note introduces a normalization of the indexing of the lower and upper numbering ramification subgroups of local class field theory. We then look at how this normalization interacts with base change for Langlands parameters.
Cite
@article{arxiv.2509.14881,
title = {Normalized Indexing for Ramification Subgroups},
author = {Stephen DeBacker and David Schwein and Cheng-Chiang Tsai},
journal= {arXiv preprint arXiv:2509.14881},
year = {2025}
}