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International Congress of Mathematicians

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ICAl 2002 • Vol. II • 681-690Value Distribution and Potential Theory*A. Eremenko^AbstractWe describe some results <strong>of</strong> value distribution theory <strong>of</strong> holomorphic curvesand quasiregular maps, which are obtained using potential theory. Among theresults discussed are: extensions <strong>of</strong> Picard's theorems to quasiregular mapsbetween Riemannian manifolds, a version <strong>of</strong> the Second Main Theorem <strong>of</strong>Nevanlinna for curves in projective space and non-linear divisors, description<strong>of</strong> extremal functions in Nevanlinna theory and results related to Cartan's1928 conjecture on holomorphic curves in the unit disc omitting hyperplanes.2000 Mathematics Subject Classification: 30D35, 30C65.Keywords and Phrases: Holomorphic curves, Quasiregular maps, Meromorphicfunctions.1. IntroductionClassical value distribution theory studies the following question: Let / bea meromorphic function in the plane. What can one say about solutions <strong>of</strong> theequation f(z) = a as a varies? The subject was originated in 1880-s with twotheorems <strong>of</strong> Picard (Theorems 1 and 4 below). An important contribution wasmade by E. Borei in 1897, who gave an "elementary pro<strong>of</strong>" <strong>of</strong> Theorem 1, whichopened a way to many generalizations. Borel's result (Theorem 12 below) alsogives an extension <strong>of</strong> Picard's theorem to holomorphic curves C —¥ P". In 1925, R.Nevanlinna (partially in cooperation with F. Nevanlinna) created what is called nowthe Nevanlinna Theory <strong>of</strong> meromorphic functions, which was subject <strong>of</strong> intensiveresearch [5]. A good elementary introduction to the subject is [18]. Griffiths andKing [16] extended Nevanlinna theory to non-degenerate holomorphic maps / :C" —¥ Y, where Y is a compact complex manifold <strong>of</strong> dimension n. In modern timesthe emphasis has shifted to two multi-dimensional generalizations: holomorphiccurves in complex manifolds and quasiregular mappings between real Riemannianmanifolds. This survey is restricted to a rather narrow topic: generalizations <strong>of</strong>* Supported by NSF grant DMS 0100512 and by the Humboldt Foundation.1 Department <strong>of</strong> Mathematics, Purdue University, West Lafayette IN 47907, USA. E-mail:eremenko@math.purdue.edu

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