We present embedding theorems for certain logarithmic Bessel potential spaces modelled upon generalized Lorentz Zygmund spaces and clarify the role of the logarithmic terms involved in the norms of the space mentioned. In particular, we get refinements of the Sobolev embedding theorems, Trudinger's
Sharpness and non-compactness of embeddings of Bessel-potential-type spaces
✍ Scribed by Amiran Gogatishvili; Júlio Severino Neves; Bohumír Opic
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 182 KB
- Volume
- 280
- Category
- Article
- ISSN
- 0025-584X
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✦ Synopsis
Abstract
We establish embeddings for Bessel potential spaces modeled upon Lorentz–Karamata spaces with order of smoothness less than one. The target spaces are of Hölder‐continuous type. In the super‐limiting case we also prove that the embedding is sharp and fails to be compact. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
📜 SIMILAR VOLUMES
## Abstract We consider Bessel‐potential spaces modelled upon Lorentz‐Karamata spaces and establish embedding theorems in the super‐limiting case. In addition, we refine a result due to Triebel, in the context of Bessel‐potential spaces, itself an improvement of the Brézis‐Wainger result (super‐lim
## Abstract Let Ω be an open subset of ℝ^__n__^ and let __p__ ∈ [1, __n__). We prove that the measure of non–compactness of the Sobolev embedding __W__^__k,p__^~0~(Ω) → __L__^__p__\*^(Ω) is equal to its norm. This means that the entropy numbers of this embedding are constant and equal to the norm.
## Abstract We establish a formula for the measure of non‐compactness of an operator interpolated by the general real method generated by a sequence lattice Γ. The formula is given in terms of the norms of the shift operators in Γ. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We use properties of Day's norm on c 0 (}) to prove that, for every Eberlein compact space K, there exists a separately continuous symmetric mapping d: K\_K Ä R such that we have d(x, y)< d(x, x)+d( y, y) 2 for any two distinct points x and y of K. As a consequence, we have that every Eberlein compa