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Continuity of the relative extremal function on analytic varieties in ℂⁿ

Frank Wikström — 2005

Annales Polonici Mathematici

Let V be an analytic variety in a domain Ω ⊂ ℂⁿ and let K ⊂ ⊂ V be a closed subset. By studying Jensen measures for certain classes of plurisubharmonic functions on V, we prove that the relative extremal function $ω_{K}$ is continuous on V if Ω is hyperconvex and K is regular.

A pure smoothness condition for Radó’s theorem for $α$ -analytic functions

Abtin Daghighi; Frank Wikström — 2016

Czechoslovak Mathematical Journal

Let $Ω \subset ℂ^{n}$ be a bounded, simply connected $ℂ$ -convex domain. Let $α \in ℤ_{+}^{n}$ and let $f$ be a function on $Ω$ which is separately $C^{2 α_{j} - 1}$ -smooth with respect to $z_{j}$ (by which we mean jointly $C^{2 α_{j} - 1}$ -smooth with respect to $Re z_{j}$ , $Im z_{j}$ ). If $f$ is $α$ -analytic on $Ω ∖ f^{- 1} (0)$ , then $f$ is $α$ -analytic on $Ω$ . The result is well-known for the case $α_{i} = 1$ , $1 \leq i \leq n$ , even when $f$ a priori is only known to be continuous.

Jensen measures, hyperconvexity and boundary behaviour of the pluricomplex Green function

Magnus Carlehed; Urban Cegrell; Frank Wikström — 1999

Annales Polonici Mathematici

We characterise hyperconvexity in terms of Jensen measures with barycentre at a boundary point. We also give an explicit formula for the pluricomplex Green function in the Hartogs triangle. Finally, we study the behaviour of the pluricomplex Green function g(z,w) as the pole w tends to a boundary point.