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plurisubharmonic function (Definition)
Definition 1   Let $ f \colon G \subset {\mathbb{C}}^n \to {\mathbb{R}}$ be an upper semi-continuous function. $ f$ is called plurisubharmonic if for every complex line $ \{ a + b z \mid z \in {\mathbb{C}} \}$ the function $ z \mapsto f(a + bz)$ is a subharmonic function on the set $ \{ z \in {\mathbb{C}} \mid a + b z \in G \}$.

Similarly, we could also define a plurisuperharmonic function just like we have a superharmonic function, but again it just means that $ -f$ is plurisubharmonic, and so this extra term is not very useful.

Definition 2   A continuous plurisubharmonic function is said to be a pseudoconvex function.

Note that since plurisubharmonic is a long word, many authors abbreviate with psh, plsh, or plush.

Bibliography

1
Steven G. Krantz. Function Theory of Several Complex Variables, AMS Chelsea Publishing, Providence, Rhode Island, 1992.



"plurisubharmonic function" is owned by jirka.
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Other names:  plurisubharmonic
Also defines:  plurisuperharmonic function, pseudoconvex function
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Cross-references: continuous, superharmonic function, subharmonic function, complex line, function, upper semi-continuous
There are 6 references to this entry.

This is version 6 of plurisubharmonic function, born on 2004-07-23, modified 2006-06-18.
Object id is 6019, canonical name is PlurisubharmonicFunction.
Accessed 4171 times total.

Classification:
AMS MSC32U05 (Several complex variables and analytic spaces :: Pluripotential theory :: Plurisubharmonic functions and generalizations)
 31C10 (Potential theory :: Other generalizations :: Pluriharmonic and plurisubharmonic functions)

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