
We construct a Banach space satisfying that the nearest point map (also called proximity mapping or metric projection) onto any non-singleton compact and convex subset is continuous but not uniformly continuous. The space we construct is locally uniformly convex, which ensures the continuity of all these nearest point maps. Moreover, we prove that every infinite-dimensional separable Banach space is arbitrarily close (in the Banach-Mazur distance) to one satisfying the above conditions.
Lipschitz and coarse geometry of metric spaces, proximity mappings, Metric Geometry (math.MG), locally uniformly convex norms, nearest point maps, Retraction, Functional Analysis (math.FA), compact convex sets, Mathematics - Functional Analysis, Banach spaces, Geometry and structure of normed linear spaces, retractions, Mathematics - Metric Geometry, Nonlinear classification of Banach spaces; nonlinear quotients, FOS: Mathematics, metric projections, 46B20, 46B80, 51F30, 54C15
Lipschitz and coarse geometry of metric spaces, proximity mappings, Metric Geometry (math.MG), locally uniformly convex norms, nearest point maps, Retraction, Functional Analysis (math.FA), compact convex sets, Mathematics - Functional Analysis, Banach spaces, Geometry and structure of normed linear spaces, retractions, Mathematics - Metric Geometry, Nonlinear classification of Banach spaces; nonlinear quotients, FOS: Mathematics, metric projections, 46B20, 46B80, 51F30, 54C15
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