Čebyšev sets in Hilbert space

Čebyšev sets in Hilbert space
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Trans. Amer. Math. Soc. 144 (1969), 235-240

DOI: https://doi.org/10.1090/S0002-9947-1969-0253023-7

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References

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Convexity of Čebyšev sets

142

Victor Klee, Remarks on nearest points in normed linear spaces, Proc. Colloquium on Convexity (Copenhagen, 1965) Kobenhavns Univ. Mat. Inst., Copenhagen, 1967, pp. 168–176. MR 0223859

Some open problems on best approximation