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Extensions and torsors for finite group schemes

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arxiv 2207.11289 v1 pith:QWCUSRYV submitted 2022-07-22 math.AG math.NT

classification math.AGmath.NT
keywords groupextensionsschemescentralfinitegroupstorsorsabelian
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We give an explicit description of the category of central extensions of a group scheme by a sheaf of Abelian groups. Based on this, we describe a framework for computing with central extensions of finite commutative group schemes, torsors under such group schemes and groups of isomorphism classes of these objects.

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Cited by 1 Pith paper

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  1. An algorithm to compute Selmer groups via resolutions by permutations modules

    cs.SC 2025-04 conditional novelty 6.0 of 10

    A general algorithm computes Selmer groups for finite Galois modules using permutation-module resolutions and Hecke operators.

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