Found 156 Documents (Results 101–156)
Über die Ordnung der starken Approximation von Funktionen durch Cebysevsche Interpolationssummen. (Russian) Zbl 0311.41016
Uniform approximation by polynomials on an interval of Bessel functions with an integral index. (English. Russian original) Zbl 0311.33010
Ukr. Math. J. 26(1974), 561-564 (1975); translation from Ukr. Mat. Zh. 26, 683-686 (1974).
A theorem of the Steckin and Leindler type connected with Abel summability of Fourier series. (English) Zbl 0309.42001
Chebyshev sets in \(C[0,1]\) which are not suns. (English) Zbl 0309.41025
MSC:
41A50
Convergence of the Fraser-Hart algorithm for rational Chebyshev approximation. (English) Zbl 0309.41024
Die beste Approximation durch lineare Spline-Funktionen vom Grade 1 mit freien Knotenpunkten. (Polish) Zbl 0309.41023
Properties of best approximation with interpolatory and restricted range side conditions. (English) Zbl 0309.41022
Best uniform approximation with Hermite-Birkhoff interpolatory side conditions. (English) Zbl 0309.41021
On the approximate solution of the Abel integral equation with discontinuous solution. (English) Zbl 0306.65081
On the best quadrature formula of the form \(\sum_{k=1}p_kf(x_k)\) for some classes of differentiable periodic functions. (English. Russian original) Zbl 0306.41013
Math. USSR, Izv. 8(1974), 591-620 (1975); translation from Izv. Akad. AUK SSSR, Ser. Mat. 38, 583-614 (1974).
On the construction, for the functions \(si\;x\) and \(\Phi(x)=(2/\sqrt\pi)\int^x_0e^{-t^2}dt\), of polynomials which approximate them almost as well as the best approximations. (English) Zbl 0306.41003
Characterization and uniqueness of best uniform vector-valued linear approximation. (English) Zbl 0305.41019
Characterization for best nonlinear approximations: A geometrical interpretation. (English) Zbl 0304.41018
Construction of positive definite matrices which are near to a given one. (English. Russian original) Zbl 0304.41015
On the numer of best approximations in certain non-linear families of functions. (English) Zbl 0304.41014
MSC:
41A50
Characterization of generalized convex functions by best \(L^2\)- approximations. (English) Zbl 0303.41030
Best approximation of the function \(| x|\) by rational functions of the form \(1/P_n(x)\). (English) Zbl 0303.41026
Kriterien erster und zweiter Ordnung für lokal beste Approximationen bei Problemen mit Nebenbedingungen. (German) Zbl 0303.41021
A minimal decay rate for solutions of stable \(n\)-th order homogeneous differential equations with constant coefficients. (English) Zbl 0301.34036
Chebyshev approximation by families with the betweeness property. II. (English) Zbl 0299.41017
MSC:
41A50
Transformed linear Chebyshev approximation. (English) Zbl 0297.41017
MSC:
41A50
Characterization theorems for constrained approximation problems via optimization theory. (English) Zbl 0297.41016
Symmetric duality, and a convergent subgradient method for discrete, linear, constrained approximation problems with arbitrary norms appearing in the objective function and in the constraints. (English) Zbl 0297.41015
MSC:
41A50
Approximative compactness and continuity of metric projections: Corrigendum. (English) Zbl 0292.41019
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