On projection constant problems and the existence of metric projections in normed spaces

We give the sufficient conditions for the existence of a metric projection onto convex closed subsets of normed linear spaces which are reduced conditions than that in the case of reflexive Banach spaces and we find a general formula for the projections onto the maximal proper subspaces of the class...

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Bibliographic Details
Main Authors: Entisarat El-Shobaky, Sahar Mohammed Ali, Wataru Takahashi
Format: Article
Language:English
Published: Wiley 2001-01-01
Series:Abstract and Applied Analysis
Online Access:http://dx.doi.org/10.1155/S1085337501000732
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Summary:We give the sufficient conditions for the existence of a metric projection onto convex closed subsets of normed linear spaces which are reduced conditions than that in the case of reflexive Banach spaces and we find a general formula for the projections onto the maximal proper subspaces of the classical Banach spaces l p,1≤p<∞ and c 0. We also give the sufficient and necessary conditions for an infinite matrix to represent a projection operator from l p,1≤p<∞ or c 0 onto anyone of their maximal proper subspaces.
ISSN:1085-3375
1687-0409