Kyrychenko Volodymyr Vasylovych (17 June 1942 -- 2 April 2019)
Journal Title: Математичні Студії - Year 2019, Vol 51, Issue 1
Abstract
Necrology about Kyrychenko Volodymyr Vasylovych
Authors and Affiliations
O. D. Artemovych, A. I. Hatalevych, I. Yo. Huran, B. V. Zabavskyi, M. M. Zarichnyi, V. M. Petrychkovych, O. M. Romaniv, O. B. Skaskiv, V. P. Shchedryk
On mathematical realism and applicability of hyperreals
We argue that Robinson’s hyperreals have just as much claim to applicability as the garden variety reals. In a recent text, Easwaran and Towsner (ET) analyze the applicability of mathematical techniques in the sciences,...
Unique range sets for powers of meromorphic functions
The prime concern of the paper is to deal with the notion of the unique range set for powers of meromorphic functions. As a consequence, we show that the lower bound of URSM (URSE) and URSM-IM (URSE-IM) can be significan...
Relative growth of Dirichlet series
Let F and G be entire functions given by Dirichlet series with exponents increasing to +∞. In the term of generalized order it is introduced a concept of their relative growth and its connection with the growth of F and...
Approximation of periodic analytic functions by Fejer sums
For upper bounds of the deviations of Fejer sums taken over classes of periodic functions that admit analytic extensions to a fixed strip of the complex plane, we obtain asymptotic equalities. In certain cases, these equ...
Growth of p-th means of the Poisson-Stieltjes integrals in polydisc
We prove a sharp upper estimate of the pth means of the Poisson-Stieltjes integrals in the unit polydisc for p>1. The estimate is given in terms of the smoothness of a complex-valued Stieltjes measure μ. If the measure μ...