Department of Theory of Functions

Kandidate of Sciences (Physics & Mathematics)
Senior Scientific Worker of the Department of Theory of Functions
ROMANYUK Viktor Sergiyovich

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CURRICULUM VITAE


LIST OF PAPERS

  1. Stepanets, A. I., Romanyuk, V. S. Classes of -differentiable functions of a complex variable and their approximation by linear means of Faber series. (Russian) - Kyiv.: Institute of Mathematics of NASU, 1992. - P.1-28. (Preprint/ NAS of Ukraine. Institute of Mathematics; 1992.15).
  2. Romanyuk, V. S. Best approximations and widths of classes of -differentiable functions of a complex variable. (Russian) - Kyiv.: Institute of Mathematics of NASU, 1992. - P.29–52. (Preprint/ NAS of Ukraine. Institute of Mathematics; 1992.15).
  3. Stepanets, A. I., Romanyuk, V. S. Classes of -differentiable functions of a complex variable and approximation by linear means of their Faber series. (Russian) - Ukr.Mat.Zh. - 1992. - 44, ¹11. - P.1432–1446; translation in Ukrainian Math. J. 44 (1992), no. 11, 1432–1446 (1993).
  4. Romanyuk, V. S. On the best approximation and Kolmogorov widths of classes of analytic functions. (Russian) - Kyiv.: Institute of Mathematics of NASU, 1992. - 39 pp. (Preprint/ NAS of Ukraine. Institute of Mathematics; 1992.20).
  5. Romanyuk V.S. Kolmogorov widths of classes of functions that are analytic in bounded domains of the complex plane. (Russian) - Fourier series: theory and applications: Collection of papers of the Institute of Mathematics of NASU. - 1992. - P.119–126.
  6. Romanyuk, V. S. Approximation of classes of analytic functions by algebraic polynomials and Kolmogorov widths. (Russian) - Ukr.Mat.Zh. - 1996. - 48, ¹2. - P.236-250; translation in Ukrainian Math. J. 48 (1996), no. 2, 267–282.
  7. Romanyuk, V. S. Approximation in the mean with weight of classes of analytic functions by algebraic polynomials and finite-dimensional subspaces. (Russian) - Ukr.Mat.Zh. - 1999. - 51, ¹5. - P.645-662; translation in Ukrainian Math. J. 51 (1999), no. 5, 716–734.
  8. Romanyuk, V. S. Estimates for the Kolmogorov widths of classes of analytic functions representable by Cauchy-type integrals. I. (Russian) - Ukr.Mat.Zh. - 2001. - 53, ¹2. - P.229-237; translation in Ukrainian Math. J. 53 (2001), no. 2, 259–269.
  9. Romanyuk, V. S. Estimates for the Kolmogorov widths of classes of analytic functions representable by Cauchy-type integrals. II. (Russian) - Ukr.Mat.Zh. - 2001. - 53, ¹3. - P.346-355; translation in Ukrainian Math. J. 53 (2001), no. 3, 395–406.
  10. Romanyuk V.S. A supplement to estimates for the approximation of classes of infinitely differentiable functions by Fourier sums. (Russian) - Extremal problems in the theory of functions and related problems: Collection of papers of the Institute of Mathematics of NASU. - 2003. - P.131–135.
  11. Romanyuk V.S. Approximation of multiple Poisson integrals. (Russian) - Approximation theory of functions and related questions: Collection of papers of the Institute of Mathematics of NASU. - 2007. - 4, ¹1. – P.258–268.
  12. Romanyuk V.S. On asymptotic estimates of Kolmogorov widths of classes of multiple Poisson integrals. (Russian) - Approximation theory of functions and related questions: Collection of papers of the Institute of Mathematics of NASU. - 2008. - 5, ¹1. – P.279–285.
  13. Romanyuk V.S. Nonlinear Diameters of Classes of Smooth Functions Defined on the Unit Sphere in . (Russian) - Mat. Zametki - 2009. - 85, ¹1. - P.147–152; translation in Math. Notes 85 (2009), no. 1-2, 136–141.
  14. Romanyuk A.S., Romanyuk V.S. Trigonometric and orthoprojective widths of classes of periodic functions of several variables. (Russian) - Ukr.Mat.Zh. - 2009. - 61, ¹10. - P.1348-1366.
  15. Romanyuk A.S., Romanyuk V.S. Asymptotic estimates of best trigonometric and bilinear approximations of classes of functions of several variables. (Russian) - Ukr.Mat.Zh. - 2010. - 62, ¹4. - P.536-551.
  16. Romanyuk V.S. Nonlinear approximation of functions of several variables from Besov classes. (Russian) - Approximation theory of functions and related questions: Collection of papers of the Institute of Mathematics of NASU. - 2010. - 7, ¹1. – P.199–226.

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