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holomorphically convex (Definition)

Let $ G \subset {\mathbb{C}}^n$ be a domain, or alternatively for a more general definition let $ G$ be an $ n$ dimensional complex analytic manifold. Further let $ {\mathcal{O}}(G)$ stand for the set of holomorphic functions on $ G$.

Definition 1   Let $ K \subset G$ be a compact set. We define the holomorphically convex hull of $ K$ as
$\displaystyle \hat{K}_G := \{ z \in G \mid \lvert f(z) \rvert \leq \sup_{w \in K} \lvert f(w) \rvert$    for all $\displaystyle f \in {\mathcal{O}}(G) \} .$    

The domain $ G$ is called holomorphically convex if for every $ K \subset G$ compact in $ G$, $ \hat{K}_G$ is also compact in $ G$. Sometimes this is just abbreviated as holomorph-convex.

Note that when $ n=1$, any domain $ G$ is holomorphically convex since when $ n=1$ $ \hat{K}_G = K$ for all compact $ K \subset G$. Also note that this is the same as being a domain of holomorphy.

Bibliography

1
Lars Hörmander. An Introduction to Complex Analysis in Several Variables, North-Holland Publishing Company, New York, New York, 1973.
2
Steven G. Krantz. Function Theory of Several Complex Variables, AMS Chelsea Publishing, Providence, Rhode Island, 1992.



"holomorphically convex" is owned by jirka.
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See Also: polynomially convex hull, Stein manifold

Other names:  holomorph-convex
Also defines:  holomorphically convex hull
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Cross-references: domain of holomorphy, compact, compact set, holomorphic functions, complex analytic manifold, domain
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This is version 5 of holomorphically convex, born on 2005-02-22, modified 2006-04-20.
Object id is 6798, canonical name is HolomorphicallyConvex.
Accessed 2691 times total.

Classification:
AMS MSC32E05 (Several complex variables and analytic spaces :: Holomorphic convexity :: Holomorphically convex complex spaces, reduction theory)

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