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The continuity of the metric projection on a subspace of finite codimension in the space of continuous functions
E. V. Oshman Ural State University
Abstract:
The closed subspaces of finite codimension of the space $C(X)$ of all continuous real-valued functions on a compact Hausdorff space $X$, for which the set of elements of best approximations of every function $f\in C(X)$ is nonempty and compact, are characterized. It is shown that if the compact Hausdorff space $X$ is infinite, then $C(X)$ has no subspace of a finite Codimension $n>1$ which has a nonempty set of elements of the best approximation for an arbitrary function $f\in C(X)$ and which has an upper-semicontinuous metric projection.
Received: 17.03.1975
Citation:
E. V. Oshman, “The continuity of the metric projection on a subspace of finite codimension in the space of continuous functions”, Mat. Zametki, 19:4 (1976), 531–539; Math. Notes, 19:4 (1976), 324–328
Linking options:
https://www.mathnet.ru/eng/mzm7771 https://www.mathnet.ru/eng/mzm/v19/i4/p531
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Abstract page: | 161 | Full-text PDF : | 76 | First page: | 1 |
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