We say that a normed linear space X is a R(1) space if the following holds: If Y is a closed subspace of finite codimension in X and every hyperplane containing Y is proximinal in X then Y is proximinal in X. In this paper we show that any closed subspace of c 0 is a R(1) space. ## 1999 Academic Pr
Countable-Codimensional Subspaces of c0-Barrelled Spaces
β Scribed by J. M. Garcia-Lafuente
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 327 KB
- Volume
- 130
- Category
- Article
- ISSN
- 0025-584X
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β¦ Synopsis
A HAUSDORFF locally convex space is said to be c,-barrelled (respectively cu-barrelled) if each sequence in the dual space t h a t converges weakly to 0 (res!,r:ctively t h a t is weakly ?.~oundecl), is equicontinuous. It is proved that if a c,,-barrelled space E has dual E' weakly sequentially complete, then every subsi'ace of countable codimensjon of E is c,-barrcllecl. %Ire prove that the hypothesis on E' cannot be dropped and we supply a n esniiiple of a complete c,,-hnrrellecl space with dual wealily sequentially coin1)lete that is not co-barrelled.
π SIMILAR VOLUMES
Let X be a Banach space and Β΅ be a finite measure space. It is shown that if 1 β€ p < β resp 1 < p < β , the Bochner space L p Β΅ X contains asymptotically isometric copies of c 0 resp l 1 if and only if X does.