The local lifting problem for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml

Let <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>k</mml:mi> </mml:math> be an algebraically closed field of characteristic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>2</mml:mn> </mml:math> . In this paper we describe the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml:mn> </mml:msup> </mml:math> -actions on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>k</mml:mi> <mml:mo>[</mml:mo> <mml:mo>[</mml:mo> <mml:mi>z</mml:mi> <mml:mo>]</mml:mo> <mml:mo>]</mml:mo> </mml:mrow> </mml:math> for which there is a discrete valuation ring <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> </mml:math> , a finite extension of the ring of Witt vectors <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>W</mml:mi> <mml:mo>(</mml:mo> <mml:mi>k</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> , such that they can be lifted as a group of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> </mml:math> -automorphisms of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>[</mml:mo> <mml:mo>[</mml:mo> <mml:mi>Z</mml:mi> <mml:mo>]</mml:mo> <mml:mo>]</mml:mo> </mml:mrow> </mml:math> . In fact the necessary and sufficient condition for such an action to lift involves only the conductor type of the corresponding extension.

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Publication Details

Journal
Journal de Théorie des Nombres de Bordeaux
Published
2025-11-27
DOI
https://doi.org/10.5802/jtnb.1344
Primary Topic
Algebraic Geometry and Number Theory
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article
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article

The local lifting problem for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml

Guillaume Pagot
Journal de Théorie des Nombres de Bordeaux
Algebraic Geometry and Number Theory
article

The local lifting problem for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml

Guillaume Pagot
article en

Abstract

Let <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>k</mml:mi> </mml:math> be an algebraically closed field of characteristic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mn>2</mml:mn> </mml:math> . In this paper we describe the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml:mn> </mml:msup> </mml:math> -actions on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>k</mml:mi> <mml:mo>[</mml:mo> <mml:mo>[</mml:mo> <mml:mi>z</mml:mi> <mml:mo>]</mml:mo> <mml:mo>]</mml:mo> </mml:mrow> </mml:math> for which there is a discrete valuation ring <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> </mml:math> , a finite extension of the ring of Witt vectors <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>W</mml:mi> <mml:mo>(</mml:mo> <mml:mi>k</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> , such that they can be lifted as a group of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> </mml:math> -automorphisms of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>R</mml:mi> <mml:mo>[</mml:mo> <mml:mo>[</mml:mo> <mml:mi>Z</mml:mi> <mml:mo>]</mml:mo> <mml:mo>]</mml:mo> </mml:mrow> </mml:math> . In fact the necessary and sufficient condition for such an action to lift involves only the conductor type of the corresponding extension.

Journal de Théorie des Nombres de BordeauxVol. 37(3)
Openalex Percentile: Top 58%
Algebraic Geometry and Number Theory
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The local lifting problem for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>ℤ</mml:mi> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mi>ℤ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mn>3</mml — Guillaume Pagot · Journal de Théorie des Nombres de Bordeaux (2025) | TGRS Research Map | TGRS