• Ramification theory and formal orbifolds in arbitrary dimension

• # Fulltext

https://www.ias.ac.in/article/fulltext/pmsc/129/03/0038

• # Keywords

Wild ramification; fundamental group; Lefschetz theorem; $l$-adic sheaves

• # Abstract

Formal orbifolds are defined in higher dimension to study wild ramification. Their étale fundamental groups are also defined. It is shown that the fundamental groups of formal orbifolds have certain finiteness property and it is also shown that they can be used to approximate the étale fundamental groups of normal varieties. Étale site on formal orbifolds are also defined.This framework allows one to study wild ramification in an organized way. Brylinski–Kato filtration, Lefschetz theorem for fundamental groups and $l$-adic sheaves in these contexts are also studied.

• # Author Affiliations

1. Statistics and Mathematics Unit, Indian Statistical Institute, Bangalore 560 059, India

• # Proceedings – Mathematical Sciences

Volume 131, 2021
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019

Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.