Abstract
In his classical paper on the moduli of 4 dimensional principally polarized abelian varieties Schottky introduced a homogeneous polynomial J of degree 16 in the Thetanullwerte which vanishes at every jacobian point. On the other hand, the analytic class invariants of even quadratic forms in 16 variables with determinant 1 can be written as f 24 and f 8, and they are Siegel modular forms of weight 8 and of an arbitrary degree g. In this paper explicit expressions of J by f 24 , f 8 and also by f 24 , the Eisenstein series E 8 for g=4 are proved. Also an outline of the proof of the fact that f 4 is the only Siegel modular form of weight 4 and of any given degree g which can be expressed as a polynomial in the Thetanullwerte is given.
This work was partially supported by the National Science Foundation.
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© 1981 Springer Basel AG
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Igusa, Ji. (1981). Schottky’s Invariant and Quadratic Forms. In: Butzer, P.L., Fehér, F. (eds) E. B. Christoffel. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5452-8_24
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DOI: https://doi.org/10.1007/978-3-0348-5452-8_24
Publisher Name: Birkhäuser, Basel
Print ISBN: 978-3-0348-5453-5
Online ISBN: 978-3-0348-5452-8
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