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In [[mathematics]], '''Souček spaces''' are generalizations of [[Sobolev spaces]], named after the [[Czech people|Czech]] [[mathematician]] [[Jiří Souček]]. One of their main advantages is that they offer a way to deal with the fact that the Sobolev space ''W''<sup>1,1</sup> is not a [[reflexive space]]; since ''W''<sup>1,1</sup> is not reflexive, it is not always true that a bounded sequence has a [[weak topology|weakly convergent]] [[subsequence]], which is a desideratum in many applications. | |||
==Definition== | |||
Let Ω be a [[bounded set|bounded domain]] in ''n''-dimensional [[Euclidean space]] with smooth [[boundary (topology)|boundary]]. The '''Souček space''' ''W''<sup>1,''μ''</sup>(Ω; '''R'''<sup>''m''</sup>) is defined to be the space of all [[ordered pair]]s (''u'', ''v''), where | |||
* ''u'' lies in the [[Lp space|Lebesgue space]] ''L''<sup>1</sup>(Ω; '''R'''<sup>''m''</sup>); | |||
* ''v'' (thought of as the gradient of ''u'') is a [[regular measure|regular]] [[Borel measure]] on the [[closure (topology)|closure]] of Ω; | |||
* there exists a sequence of functions ''u''<sub>''k''</sub> in the Sobolev space ''W''<sup>1,1</sup>(Ω; '''R'''<sup>''m''</sup>) such that | |||
::<math>\lim_{k \to \infty} u_{k} = u \mbox{ in } L^{1} (\Omega; \mathbf{R}^{m})</math> | |||
:and | |||
::<math>\lim_{k \to \infty} \nabla u_{k} = v</math> | |||
:weakly-∗ in the space of all [[vector-valued measure|'''R'''<sup>''m''×''n''</sup>-valued]] regular Borel measures on the closure of Ω. | |||
==Properties== | |||
* The Souček space ''W''<sup>1,''μ''</sup>(Ω; '''R'''<sup>''m''</sup>) is a [[Banach space]] when equipped with the [[norm (mathematics)|norm]] given by | |||
::<math>\| (u, v) \| := \| u \|_{L^{1}} + \| v \|_{M},</math> | |||
:i.e. the sum of the ''L''<sup>1</sup> and [[total variation]] norms of the two components. | |||
==References== | |||
* {{cite journal | |||
| last = Souček | |||
| first = Jiří | |||
| title = Spaces of functions on domain Ω, whose ''k''-th derivatives are measures defined on Ω̅ | |||
| journal = Časopis Pěst. Mat. | |||
| volume = 97 | |||
| year = 1972 | |||
| pages = 10–46, 94 | |||
| issn = 0528-2195 | |||
}} {{MathSciNet|id=0313798}} | |||
{{DEFAULTSORT:Soucek space}} | |||
[[Category:Banach spaces]] | |||
[[Category:Sobolev spaces]] |
Revision as of 05:43, 28 February 2013
In mathematics, Souček spaces are generalizations of Sobolev spaces, named after the Czech mathematician Jiří Souček. One of their main advantages is that they offer a way to deal with the fact that the Sobolev space W1,1 is not a reflexive space; since W1,1 is not reflexive, it is not always true that a bounded sequence has a weakly convergent subsequence, which is a desideratum in many applications.
Definition
Let Ω be a bounded domain in n-dimensional Euclidean space with smooth boundary. The Souček space W1,μ(Ω; Rm) is defined to be the space of all ordered pairs (u, v), where
- u lies in the Lebesgue space L1(Ω; Rm);
- v (thought of as the gradient of u) is a regular Borel measure on the closure of Ω;
- there exists a sequence of functions uk in the Sobolev space W1,1(Ω; Rm) such that
- and
- weakly-∗ in the space of all Rm×n-valued regular Borel measures on the closure of Ω.
Properties
- The Souček space W1,μ(Ω; Rm) is a Banach space when equipped with the norm given by
- i.e. the sum of the L1 and total variation norms of the two components.
References
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