What are the key differences between H1 and H2 Hilbert spaces?

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The discussion clarifies the differences between H1 and H2 Hilbert spaces, which are specific Sobolev spaces denoted as H^k = W^{k,2}. The "2" indicates the use of the L^2 norm, while "k" signifies the inclusion of derivatives up to the kth order in the function analysis. Specifically, the norm is defined as ||f||^2_{H^k} = ||f||^2_{W^{k,2}} = ∑_{i=0}^k ∫ dt |f^{(i)}|^2, highlighting the importance of derivatives in these spaces.

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Hilbert Space...

Can somebody tell me the difference between H1 & H2 hilbert spaces?
 
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amalmirando said:
Can somebody tell me the difference between H1 & H2 hilbert spaces?
These are two special Sobolev spaces, namely

[tex]H^k = W^{k,2}[/tex]

The "2" refers to the usual norm of the [tex]L^2[/tex] Hilbert space. The "k" means that instead of the function [tex]f(x)[/tex] one considers in addition its first, second, ..., kth derivative:

[tex]||f||^2_{H^k} = ||f||^2_{W^{k,2}} = \sum_{i=0}^k\int dt\,|f^{(i)}|^2[/tex]
 

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