1. MINIMAL SHAPE-PRESERVING PROJECTIONS ONTO ∏n: GENERALIZATIONS AND EXTENSIONS.
- Author
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Lewicki, G. and Prophet, M. P.
- Subjects
ALGORITHMS ,FOUNDATIONS of arithmetic ,GRAPHICAL projection ,SPACES of measures ,MATHEMATICS - Abstract
The goal of this paper is to further the investigation begun in Chalmers and Prophet, Numer. Funct. Anal. Optimiz. 1997; 18:507–520. With the benefit of nearly 10 years of work, we begin by indicating how several proofs from Chalmers and Prophet, Numer. Funct. Anal. Optimiz. 1997; 18:507–520, can be substantially improved. We show that the problem of preserving k-convexity onto Π
n is one part of a larger shape-preserving problem (multiconvex preservation) relative to Πn , and we completely solve this expanded problem. And finally, we demonstrate that multiconvex preserving projections constructed in this paper are in fact of minimal operator norm in a large class of Banach spaces. [ABSTRACT FROM AUTHOR]- Published
- 2006
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