By Herbert Lange, Wolfgang Barth, Klaus Hulek

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Additional resources for Abelian Varieties: Proceedings of the International Conference Held in Egloffstein, Germany, October 3-8, 1993

Example text

Proof. 8. We observe that the curve CQ = N' · C5 contains the point N' • V = Ν • V . Clearly, the curve C5 lies on the surfaces Hi and Hz , the similar property is true for C6. There arise no other points in the respective intersections. 10 (i). 9. 8 the invariance group is given as the normalizer of the respective isotropy group. Since the isotropy group of C5 contains only the involutions ±Iz, ± i s every element of the invariance group must be contained in the normalizer of < ±Iz > and < ± J5 > .

We may thus assume that Ζ is lying on the union C5 U CQ C HI in Aij. 11. • Proposition 4 . 1 4 . Any curve admits an analytic isomorphism curve Y(2). to the modular Proof. Via the action of Sp(4, Z) the curves C5 and CQ are biholomorphic equivalent to the curve { z i 2 | 2 G HI} . 11 (ii) we have therefore established a part of the assertion. The corresponding proof for the curve C4 demands a lot of more work. a (IS0C4). We proceed in steps: Step I: We claim that gl3gΕ {±h} , gQzg~l G {±<^2} holds.

Kahn and S. Weintraub have already considered the branch and singular locus of the moduli space A\ i n when η is an odd prime [HKW2]. For arbitrary η the situation is obviously more complicated, especially when η is even. But fortunately the statement about the singular locus remains unchanged. Denote by X (η) resp. Y (n) the moduli space of elliptic curves with level-nstructure resp. with a n-torsion point. Let Ei and Eg denote the unique elliptic curves with an automorphism of order 4 resp. 6.

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