Wild ramification of moduli spaces for curves or for abelian varieties
Tsutomu Sekiguchi (1985)
Compositio Mathematica
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Tsutomu Sekiguchi (1985)
Compositio Mathematica
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Alice Silverberg (1988)
Compositio Mathematica
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Alice Silverberg, Yuri G. Zarhin (1995)
Annales de l'institut Fourier
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The main result of this paper implies that if an abelian variety over a field has a maximal isotropic subgroup of -torsion points all of which are defined over , and , then the abelian variety has semistable reduction away from . This result can be viewed as an extension of Raynaud’s theorem that if an abelian variety and all its -torsion points are defined over a field and , then the abelian variety has semistable reduction away from . We also give information about the Néron...
Federica Galluzzi (1999)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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Let be a family of Mumford-type, that is, a family of polarized complex abelian fourfolds as introduced by Mumford in [9]. This family is defined starting from a quaternion algebra over a real cubic number field and imposing a condition to the corestriction of such . In this paper, under some extra conditions on the algebra , we make this condition explicit and in this way we are able to describe the polarization and the complex structures of the fibers. Then, we look at the non...
Yung-sheng Tai (1982)
Inventiones mathematicae
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Ehud De Shalit, Eyal Z. Goren (1997)
Annales de l'institut Fourier
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We study a certain finitely generated multiplicative subgroup of the Hilbert class field of a quartic CM field. It consists of special values of certain theta functions of genus 2 and is analogous to the group of Siegel units. Questions of integrality of these specials values are related to the arithmetic of the Siegel moduli space.
Yuri Zarhin (2014)
Open Mathematics
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The aim of this paper is to extend our previous results about Galois action on the torsion points of abelian varieties to the case of (finitely generated) fields of characteristic 2.