ملخص
This paper is a generalization of the result obtained by F. Deutsch, G. Nürnberger, and I. Singer (1980, Pacific J. Math. 88, 9-31). It is shown that if Q is a locally compact totally ordered space, and N is an n-dimensional subspace of C0(Q), then N is a weak Chebyshev subspace if and only if for each f ε{lunate} C0(Q), there is g ε{lunate} N such that ∥f - g∥ = d(f, N) and (f - g) equioscillates at (n + 1) points.
اللغة الأصلية | English |
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الصفحات (من إلى) | 129-141 |
عدد الصفحات | 13 |
دورية | Journal of Approximation Theory |
مستوى الصوت | 67 |
رقم الإصدار | 2 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | Published - نوفمبر 1991 |
منشور خارجيًا | نعم |
ASJC Scopus subject areas
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