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On Poreda’s problem on the strong unicity constants. (English) Zbl 0478.41024

MSC:
41A52 Uniqueness of best approximation
41A10 Approximation by polynomials
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[1] Bartelt, M.W, On Lipschitz conditions, strong unicity and a theorem of A. K. cline, J. approx. theory, 14, 245-250, (1975) · Zbl 0322.41020
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[10] Newman, D.J; Shapiro, H.S, Some theorems on C̆ebyšev approximation, Duke math. J., 30, 673-681, (1963) · Zbl 0116.04502
[11] Poreda, S.J, Counterexamples in best approximation, (), 167-171 · Zbl 0331.41007
[12] Rice, J.R, ()
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