Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Kal'chuk, A."'
Autor:
Inna Kal’chuk
Publikováno v:
Axioms, Vol 13, Iss 3, p 168 (2024)
In this editorial, we present “Theory of Functions and Applications”, a Special Issue of Axioms [...]
Externí odkaz:
https://doaj.org/article/5fb499e6c84a421187e76a143b9f9e05
Autor:
Kharkevych, Yurii1 (AUTHOR) k.inna.80@gmail.com, Kal'chuk, Inna1 (AUTHOR)
Publikováno v:
Axioms (2075-1680). Nov2023, Vol. 12 Issue 11, p1010. 14p.
Autor:
Yurii Kharkevych, Inna Kal’chuk
Publikováno v:
Axioms, Vol 12, Iss 11, p 1010 (2023)
In this paper, we considered arbitrary linear summation methods of Fourier series specified by a set of continuous functions dependent on the real parameter and established their approximation properties. We obtained asymptotic formulas for the exact
Externí odkaz:
https://doaj.org/article/5f4ee780a80948dfa6474d346705d551
Autor:
Kal'chuk, Inna1 (AUTHOR) k.inna.80@gmail.com
Publikováno v:
Axioms (2075-1680). Mar2024, Vol. 13 Issue 3, p168. 3p.
Autor:
Hrabova, Ulyana Z.1 (AUTHOR) grabova_u@ukr.net, Kal'chuk, Inna V.1 (AUTHOR)
Publikováno v:
Journal of Mathematical Sciences. Aug2023, Vol. 274 Issue 3, p327-339. 13p.
Autor:
Bushev, Dmytro1 (AUTHOR) bushev-d@ukr.net, Kal'chuk, Inna1 (AUTHOR) k.inna.80@gmail.com
Publikováno v:
Axioms (2075-1680). Aug2023, Vol. 12 Issue 8, p763. 17p.
Publikováno v:
Karpatsʹkì Matematičnì Publìkacìï, Vol 13, Iss 3, Pp 805-817 (2021)
In the work, we found integral representations for function spaces that are isometric to spaces of entire functions of exponential type, which are necessary for giving examples of equality of approximation characteristics in function spaces isometric
Externí odkaz:
https://doaj.org/article/c3605e55784a434e91951d5e37b6846e
Autor:
Dmytro Bushev, Inna Kal’chuk
Publikováno v:
Axioms, Vol 12, Iss 8, p 763 (2023)
In this paper, we find the sets of all extremal functions for approximations of the Hölder classes of H1 2π-periodic functions of one variable by the Favard sums, which coincide with the set of all extremal functions realizing the exact upper bound
Externí odkaz:
https://doaj.org/article/527411da225e40fe81bae17fa240ef23
Publikováno v:
Karpatsʹkì Matematičnì Publìkacìï, Vol 12, Iss 1, Pp 138-147 (2020)
Among the actual problems of the theory of approximation of functions one should highlight a wide range of extremal problems, in particular, studying the approximation of functional classes by various linear methods of summation of the Fourier series
Externí odkaz:
https://doaj.org/article/45ea94f144854341b80af949c895d080
Autor:
Hrabova, Ulyana Z.1 (AUTHOR) grabova_u@ukr.net, Kal'chuk, Inna V.1 (AUTHOR)
Publikováno v:
Journal of Mathematical Sciences. Dec2022, Vol. 268 Issue 2, p178-191. 14p.