Projections in normed linear spaces and sufficient enlargements

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dc.creatorOstrovskii, M. I.
dc.date2002-03-08
dc.date.accessioned2026-07-07T04:46:56Z
dc.date.available2026-07-07T04:46:56Z
dc.descriptionDefinition. A symmetric with respect to 0 bounded closed convex set A in a finite dimensional normed space X is called a sufficient enlargement for X (or of B(X)) if for arbitrary isometric embedding of X into a Banach space Y there exists a projection P:Y\to X such that P(B(Y)) is a subset of A (by B(X) we denote the unit ball). The notion of sufficient enlargement is implicit in the paper: B.Grunbaum, Projection constants, Trans. Amer. Math. Soc. 95 (1960) 451--465. It was explicilty introduced by the author in: M.I.Ostrovskii, Generalization of projection constants: sufficient enlargements, Extracta Math., 11 (1996), 466--474. The main purpose of the present paper is to continue investigation of sufficient enlargements started in the papers cited above. In particular the author investigate sufficient enlargements whose support functions are in some directions close to those of the unit ball of the space, sufficient enlargements of minimal volume, sufficient enlargements for euclidean spaces.
dc.descriptionInformation on related research can be found on the author's web page: http://www.arts-sciences.cua.edu/math/MIO/
dc.identifierhttps://arxiv.org/abs/math/0203085
dc.identifierhttp://arxiv.org/abs/math/0203085
dc.identifierArchiv der Mathematik, 71 (1998), 315-324
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/63528
dc.subjectFunctional Analysis
dc.subjectMetric Geometry
dc.subject46B07, 52A21
dc.titleProjections in normed linear spaces and sufficient enlargements
dc.typetext

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