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Bergman space (Definition)

Let $ G \subset {\mathbb{C}}^n$ be a domain and let $ dV$ denote the Euclidean volume measure on $ G$.

Definition 1   Let
$\displaystyle A^2(G) := \Big\{ f$    holomorpic in $\displaystyle G ~\Big\vert~ \sqrt{ \int_G \lvert f(z) \rvert^2 dV(z) } < \infty \Big\} .$    

$ A^2(G)$ is called the Bergman space on $ G$. The norm on this space is defined as
$\displaystyle \lVert f \rVert := \sqrt{ \int_G \lvert f(z) \rvert^2 dV(z) } .$    

Further we define an inner product on $ A^2(G)$ as
$\displaystyle \langle f , g \rangle := \int_G f(z) \overline{g(z)} dV(z) .$    

The inner product as defined above really is an inner product and further it can be shown that $ A^2(G)$ is complete since convergence in the above norm can be shown to be the same as normal convergence (uniform convergence on compact subsets). The space $ A^2(G)$ is therefore a Hilbert space. Sometimes this space is also denoted by $ L_a^2(G)$.

Bibliography

1
D'Angelo, John P. Several complex variables and the geometry of real hypersurfaces, CRC Press, 1993.
2
Steven G. Krantz. Function Theory of Several Complex Variables, AMS Chelsea Publishing, Providence, Rhode Island, 1992.



"Bergman space" is owned by jirka.
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See Also: Bergman kernel

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Cross-references: Hilbert space, compact subsets, uniform convergence, normal convergence, complete, inner product, norm, euclidean volume measure, domain
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This is version 6 of Bergman space, born on 2005-02-22, modified 2007-12-14.
Object id is 6801, canonical name is BergmanSpace.
Accessed 2533 times total.

Classification:
AMS MSC32A36 (Several complex variables and analytic spaces :: Holomorphic functions of several complex variables :: Bergman spaces)

Pending Errata and Addenda
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