Vol. 61 No. 4 (2009)

Published: 25.04.2009

Research articles

Comonotone approximation of twice differentiable periodic functions

H. A. Dzyubenko

435-451
- PDF (Ukrainian)
- Springer
$A_2$-continued fraction representation of real numbers and its geometry

S. O. Dmytrenko, D. V. Kyurchev, M. V. Pratsiovytyi

452-463
- PDF (Ukrainian)
- Springer
On the theory of stability of matrix differential equations

D. M. Lila, A. A. Martynyuk

464-471
- PDF (Russian)
- Springer
Generalized boundary values of the solutions of semilinear elliptic equations from weighted functional spaces

G. P. Lopushanskaya

472-493
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- Springer
Approximative characteristics of the isotropic classes of periodic functions of many variables

A. S. Romanyuk

513-523
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- Springer
Approximation of the classes $C_{β}^{ψ} H_{ω}$ by generalized Zygmund sums

E. Yu. Ovsii, A. S. Serdyuk

524-537
- PDF (Russian)
- Springer
On an unbounded order parameter in lattice equilibrium GKS-type oscillator systems

W. I. Skrypnik

538-547
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- Springer
Weakly nonlinear boundary-value problem in a special critical case

S. M. Chuiko

548-562
- PDF (Russian)
- Springer

Short communications

Negative result in pointwise 3-convex polynomial approximation

A. V. Bondarenko, J. Gilewicz

563-567
- PDF (Russian)
- Springer
Simple derivations of higher degree in two variables

V. S. Havran

568-571
- PDF (Ukrainian)
- Springer
Best cubature formulas for some classes of continuous functions of two variables

O. V. Polyakov, N. O. Polyakova

572-576
- PDF (Ukrainian)
- Springer