STNB2023(36th edition)
Grups de components de models de Néron
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Abstract
We will explain how to prove a bound for the coinvariants of a group acting on a finitely generated abelian group, and how this is applied to obtain some results concerning the group of components of the Néron model for tori and for abelian varieties. This result solves a question of Bas Edixhoven from 1995.
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