Vol. 15, No. 10, 2021

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Frobenius splitting of valuation rings and $F$-singularities of centers

Rankeya Datta

Vol. 15 (2021), No. 10, 2485–2512
DOI: 10.2140/ant.2021.15.2485
Abstract

Using a local monomialization result of Knaf and Kuhlmann, which was generalized by Cutkosky, we prove that the valuation ring of an Abhyankar valuation of a function field over an F-finite ground field of prime characteristic is Frobenius split. We show that a Frobenius splitting of a sufficiently well-behaved center lifts to a Frobenius splitting of the valuation ring. We also investigate properties of valuations centered on arbitrary Noetherian domains of prime characteristic. In contrast to our work with Smith (Algebra Number Theory 10:5 (2016), 1057–1090 and its correction in 11:4 (2017), 1003–1007), this paper emphasizes the role of centers in controlling properties of valuation rings in prime characteristic.

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Keywords
Frobenius splitting, Abhyankar valuations, valuation rings, $F$-singularities, $F$-finiteness
Mathematical Subject Classification 2010
Primary: 13F30
Secondary: 13A35, 14B05
Milestones
Received: 16 January 2020
Accepted: 7 March 2021
Published: 8 February 2022
Authors
Rankeya Datta
Department of Mathematics, Statistics, and Computer Science
University of Illinois at Chicago
Chicago, IL
United States