Arkiv för Matematik

The pluripolar hull of a graph and fine analytic continuation

Tomas Edlund and Burglind Jöricke

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We show that if the graph of an analytic function in the unit disk D is not complete pluripolar in C2 then the projection of its pluripolar hull contains a fine neighborhood of a point $p\in\partial\mathbf{D}$. Moreover the projection of the pluripolar hull is always finely open. On the other hand we show that if an analytic function f in D extends to a function ℱ which is defined on a fine neighborhood of a point $p\in\partial\mathbf{D}$ and is finely analytic at p then the pluripolar hull of the graph of f contains the graph of ℱ over a smaller fine neighborhood of p. We give several examples of functions with this property of fine analytic continuation. As a corollary we obtain new classes of analytic functions in the disk which have non-trivial pluripolar hulls, among them C functions on the closed unit disk which are nowhere analytically extendible and have infinitely-sheeted pluripolar hulls. Previous examples of functions with non-trivial pluripolar hull of the graph have fine analytic continuation.

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Ark. Mat., Volume 44, Number 1 (2006), 39-60.

Received: 4 May 2004
First available in Project Euclid: 31 January 2017

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2006 © Institut Mittag-Leffler


Edlund, Tomas; Jöricke, Burglind. The pluripolar hull of a graph and fine analytic continuation. Ark. Mat. 44 (2006), no. 1, 39--60. doi:10.1007/s11512-005-0004-3.

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