Intersection numbers of curves on Hilbert modular surfaces and modular forms of Nebentypus

@article{Hirzebruch1976IntersectionNO,
  title={Intersection numbers of curves on Hilbert modular surfaces and modular forms of Nebentypus},
  author={Friedrich Hirzebruch and Don Zagier},
  journal={Inventiones Mathematicae},
  year={1976},
  volume={36},
  pages={57-113}
}
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 57 Chapter 1 : The Intersection Behaviour of the Curves T N . . . . . . 60 1.1. Special Points . . . . . . . . . . . . . . . . . . . . . 60 1.2. Modules in Imaginary Quadratic Fields . . . . . . . . . . 68 1.3. The Transversal Intersections of the Curves T N . . . . . . . 74 1.4. Contributions from the Cusps . . . . . . . . . . . . . . 78 1.5. Self-Intersections . . . . . . . . . . . . . . . . . . . . 82 Chapter 2: Modular Forms… 
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