Bulletin of the London Mathematical Society Advance Access originally published online on March 18, 2009
Bulletin of the London Mathematical Society 2009 41(3):423-428; doi:10.1112/blms/bdp012
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© 2009 London Mathematical Society
On theta functions of order 4
MEAG NY
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Département de Mathématiques
Université de Montpellier II
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pauly@math.univ-montp2.fr
Laboratoire Paul Painlevé
UMR 8524 du CNRS
Université des Sciences et Technologies de Lille
Cité scientifique
59655 Villeneuve dAscq Cedex
France
Received 6 November 2008.
We prove that the fourth powers of theta functions with even characteristics form a basis of the space H0(A,
A(4
))+ of even theta functions of order 4 on a principally polarized Abelian variety (A,
) without a vanishing theta-null.
2000 Mathematics Subject Classification 14K25 (primary).
The second author was partially supported by the Ministerio de Educación y Ciencia (Spain) through the grant SAB2006-0022.