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Generalized Ahlfors functions
Authors:Miran Cerne   Manuel Flores
Affiliation:Department of Mathematics, University of Ljubljana, Jadranska 19, 1111 Ljubljana, Slovenia ; Department of Mathematics, University of La Laguna, 38771 La Laguna, Tenerife, Spain
Abstract:Let $ Sigma$ be a bordered Riemann surface with genus $ g$ and $ m$ boundary components. Let $ lbracegamma_{z}rbrace_{zinpartialSigma}$ be a smooth family of smooth Jordan curves in $ mathbb{C}$ which all contain the point 0 in their interior. Let $ pinSigma$ and let $ {mathcal F}$ be the family of all bounded holomorphic functions $ f$ on $ Sigma$ such that $ f(p)ge 0$ and $ f(z)in widehat{gamma_z}$ for almost every $ zinpartialSigma$. Then there exists a smooth up to the boundary holomorphic function $ f_0in {mathcal F}$ with at most $ 2g+m-1$ zeros on $ Sigma$ so that $ f_0(z)ingamma_z$ for every $ zinpartialSigma$ and such that $ f_0(p)ge f(p)$ for every $ fin {mathcal F}$. If, in addition, all the curves $ lbracegamma_zrbrace_{zinpartialSigma}$ are strictly convex, then $ f_0$ is unique among all the functions from the family $ {mathcal F}$.

Keywords:Bordered Riemann surface   Ahlfors function   Riemann-Hilbert problem
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