Gunning-Narasimhan's theorem with a growth condition

Details Gunning-Narasimhan's theorem with a growth condition Gunning-Narasimhan's theorem with a growth condition

2011-06-05

arxiv.org/abs/1106.0936v5

Mathematics

Complex Variables

J. Geom. Anal., in press

Scientific paper

Given a compact Riemann surface X and a point x_0 in X, we construct a holomorphic function without critical points on the punctured Riemann surface R = X - x_0 which is of finite order at the point x_0. This complements the result of Gunning and Narasimhan from 1967 who constructed a noncritical holomorphic function on every open Riemann surface, but without imposing any growth condition. On the other hand, if the genus of X is at least one, then we show that every algebraic function on R admits a critical point. Our proof also shows that every cohomology class in H^1(X;C) is represented as a de Rham class by a nowhere vanishing holomorphic one-form of finite order on the punctured surface X-x_0.

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