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Beppo-Levi space : ウィキペディア英語版
Beppo-Levi space
In functional analysis, a branch of mathematics, a Beppo-Levi space, named after Beppo Levi, is a certain space of generalized functions.
In the following, is the space of distributions, is the space of tempered distributions in , the differentiation operator with a multi-index, and \widehat is the Fourier transform of .
The Beppo-Levi space is
:\dot^ = \left \,
where denotes the Sobolev semi-norm.
An alternative definition is as follows: let such that
: -m + \tfrac < s < \tfrac
and define:
:\begin
H^s &= \left \(\mathbf^n), \int_ |\xi|^| \widehat (\xi)|^2 \, d\xi < \infty \right \} \\ ()
X^ &= \left \ v \in H^s \right \} \\
\end
Then is the Beppo-Levi space.
==References==

* Wendland, Holger (2005), ''Scattered Data Approximation'', Cambridge University Press.
* Rémi Arcangéli; María Cruz López de Silanes; Juan José Torrens (2007), "An extension of a bound for functions in Sobolev spaces, with applications to (m,s)-spline interpolation and smoothing" ''Numerische Mathematik''
* Rémi Arcangéli; María Cruz López de Silanes; Juan José Torrens (2009), "Estimates for functions in Sobolev spaces defined on unbounded domains" ''Journal of Approximation Theory''

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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