Automorphisms of perfect power series rings
Rings and Algebras
2018-07-02 v3 Number Theory
Abstract
Let R be a perfect ring of characteristic p. We show that the group of continuous R-linear automorphisms of the perfect power series ring over R is generated by the automorphisms of the ordinary power series ring together with Frobenius; this answers a question of Jared Weinstein.
Keywords
Cite
@article{arxiv.1602.09051,
title = {Automorphisms of perfect power series rings},
author = {Kiran S. Kedlaya},
journal= {arXiv preprint arXiv:1602.09051},
year = {2018}
}
Comments
4 pages; v3: final submitted version