Quasiconformal extensions to space of Weierstrass-Enneper lifts
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The Ahlfors-Weill extension of a conformal mapping of the disk is generalized to the Weierstrass-Enneper lift of a harmonic mapping of the disk to a minimal surface, producing homeomorphic and quasiconformal extensions to space. The extension is defined through the family of best Möbius approximations to the lift applied to a bundle of euclidean circles orthogonal to the disk. Extension of the planar harmonic map is also obtained subject to additional assumptions on the dilatation. The hypotheses involve bounds on a generalized Schwarzian derivative for harmonic mappings in terms of the hyperbolic metric of the disk and the Gaussian curvature of the minimal surface. Hyperbolic convexity plays a crucial role.
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- L. Ahlfors, Cross-ratios and Schwarzian derivatives in Rn, in Complex Analysis: Articles dedicated to Albert Pfluger on the Occasion of his 80th Birthday, Birkhäuser Verlag, Basel, 1989, pp. 1–15.Google Scholar