Abstract
An abelian variety is by definition a complex torus admitting a positive definite line bundle. The Riemann Relations are necessary and sufficient conditions for a complex torus to be an abelian variety. They were given by Riemann in the special case of the Jacobian variety of a curve (see Chapter 11). For the general statement we refer to Poincaré-Picard [1] and Frobenius [2], although it was apparently known to Riemann and Weierstraß. Another characterization of abelian varieties is due to Lefschetz [1] p. 367: a complex torus is an abelian variety if and only if it admits the structure of an algebraic variety. Lefschetz showed that if L is a positive definite line bundle on a complex torus X, then L n is very ample for any n ≥ 3, i.e. the map φL n: X → ℙ N associated to the line bundle L n is an embedding.
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© 2004 Springer-Verlag Berlin Heidelberg
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Birkenhake, C., Lange, H. (2004). Abelian Varieties. In: Complex Abelian Varieties. Grundlehren der mathematischen Wissenschaften, vol 302. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-06307-1_6
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DOI: https://doi.org/10.1007/978-3-662-06307-1_6
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-05807-3
Online ISBN: 978-3-662-06307-1
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