Moduli of (1,7)-polarized abelian surfaces via syzygies

Details Moduli of (1,7)-polarized abelian surfaces via syzygies Moduli of (1,7)-polarized abelian surfaces via syzygies

1998-12-19

arxiv.org/abs/math/9812121v1

Mathematics

Algebraic Geometry

20 pages, TeX

Scientific paper

We prove that the moduli space X(1,7) of (1,7)-polarized abelian surfaces
with canonical level structure is birational to the Fano 3-fold V22 of polar
hexagons of the Klein quartic X(7). In particular X(1,7) is rational and the
birational map to P^3 is defined over Q. As a byproduct we obtain explicitely
the equations of the (1,7)-very-ample polarized abelian surfaces in P^6.

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