Twisting by a Torsor

Michel Emsalem ()
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Michel Emsalem: Université Lille 1, U.F.R. de Mathématiques

A chapter in Analytic and Algebraic Geometry, 2017, pp 125-152 from Springer

Abstract: Abstract Twisting by a G-torsor an object endowed with an action of a group G is a classical tool. For instance one finds in the paragraph 5.3 of the book [17] the description of the “opération de torsion” in a particular context. The aim of this note is to give a formalization of this twisting operation as general as possible in the algebraic geometric framework and to present a few applications. We will focus in particular to the application to the problem of specialization of covers addressed by P. Dèbes et al. in a series of papers.

Keywords: torsors; group-schemes (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-981-10-5648-2_9

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DOI: 10.1007/978-981-10-5648-2_9

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