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Complex Ball Quotients and Line Arrangements in the Projective Plane (MN-51)$
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Paula Tretkoff

Print publication date: 2016

Print ISBN-13: 9780691144771

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691144771.001.0001

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Riemann Surfaces, Coverings, and Hypergeometric Functions

Riemann Surfaces, Coverings, and Hypergeometric Functions

(p.23) Chapter Two Riemann Surfaces, Coverings, and Hypergeometric Functions
Complex Ball Quotients and Line Arrangements in the Projective Plane (MN-51)

Paula Tretkoff

Princeton University Press

This chapter deals with Riemann surfaces, coverings, and hypergeometric functions. It first considers the genus and Euler number of a Riemann surface before discussing Möbius transformations and notes that an automorphism of a Riemann surface is a biholomorphic map of the Riemann surface onto itself. It then describes a Riemannian metric and the Gauss-Bonnet theorem, which can be interpreted as a relation between the Gaussian curvature of a compact Riemann surface X and its Euler characteristic. It also examines the behavior of the Euler number under finite covering, along with finite subgroups of the group of fractional linear transformations PSL(2, C). Finally, it presents some basic facts about the classical Gauss hypergeometric functions of one complex variable, triangle groups acting discontinuously on one of the simply connected Riemann surfaces, and the hypergeometric monodromy group.

Keywords:   finite covering, Riemann surface, Euler number, Möbius transformation, Riemannian metric, Gaussian curvature, Gauss hypergeometric function, triangle groups, monodromy group, fractional linear transformation

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