K-functionals and extreme problems of the theory of approximation of the classes of analytic functions in a circle. II by S. B. Vakarchuk, M. B. Vakarchuk

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On the estimates of the values of various widths of classes of functions of two variables in the weight space L2,г(R2), г=exp(−x2 − y2) by S. B. Vakarchuk, M. B. Vakarchuk

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On total moduli of continuity for 2periodic functions of two variables in the space L_(2,2) by S. B. Vakarchuk, M. B. Vakarchuk

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Best approximation by "angles" of analytic in the unit bidisk functions by S. B. Vakarchuk, M. B. Vakarchuk

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K-functionals and extreme problems of the theory of approximation for classes of analytic functions in the circle. I by S. B. Vakarchuk, M. B. Vakarchuk

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On the estimates of widths of the classes of functions defined by the generalized moduli of continuity and majorants in the weighted space L2x(0,1) by S. B. Vakarchuk

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Generalized characteristics of smoothness and some extreme problems of the approximation theory of functions in the space L2 (R). I by S. B. Vakarchuk

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Generalized characteristics of smoothness and some extreme problems of the approximation theory of functions in the space L2(R). II by S. B. Vakarchuk

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On the moduli of continuity and fractional-order derivatives in the problems of best mean-square approximations by entire functions of the exponential type on the entire real axis by S. B. Vakarchuk

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Widths of some classes of functions defined by the generalized moduli of continuity _in the space L_2 by S. B. Vakarchuk

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On estimates of diameter values of classes of functions in the weight space L2,γ(R2), γ = exp(−x2 − y2) by S. B. Vakarchuk

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Exact constants in Jackson-type inequalities for the best mean square approximation in L_2(R) and exact values of mean nu-widths of the classes of functions by S. B. Vakarchuk

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Jackson-type inequalities with generalized modulus of continuity and exact values of the n-widths of the classes of (ψ,β)-differential functions in L2. I by S. B. Vakarchuk

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Jackson-type inequalities with generalized modulus of continuity and exact values of the n-widths of the classes of (ψ,β)-differentiable functions in L2. II by S. B. Vakarchuk

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Jackson-Type Inequalities for the Special Moduli of Continuity on the Entire Real Axis and the Exact Values of Mean ν-Widths for the Classes of Functions in the Space L2 (R) by S. B. Vakarchuk

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Widths of classes of functions in the weight space L2,г(R),г=exp(−x2) by S. B. Vakarchuk

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On the Best Polynomial Approximations of Entire Transcendental Functions of Many Complex Variables in Some Banach Spaces by S. B. Vakarchuk, S. I. Zhir

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On the best approximation by "angles" in the mean on the plane R2 with the Chebyshev-Hermite weight by S. B. Vakarchuk, A. V. Shvachko

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On the Best Approximation in the Mean by Algebraic Polynomials with Weight and the Exact Values of Widths for the Classes of Functions by S. B. Vakarchuk, A. V. Shvachko

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On the approximation in the mean with the Chebyshev-Hermite weight by algebraic polynomials on the real axis by S. B. Vakarchuk, A. V. Shvachko

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