Vol. 78 No. 9-10 (2026)

Published: 25.09.2026

Research articles

Lie and point symmetries of Nyzhnyk models

O. Vinnichenko, V. Boyko, R. Popovych

624–672
- Requires Subscription PDF (Ukrainian)
Stability under perturbations of $\pi$-fraction approximants

V. Hladun

673–694
- Requires Subscription PDF (Ukrainian)
Bounded solutions of a bilateral difference equation with unbounded piecewise constant operator coefficients

M. Horodnii, Ye. Tykha

695–703
- Requires Subscription PDF (Ukrainian)
A problem with exponential integral conditions for a factorized partial differential equation

A. Kuz

704–726
- Requires Subscription PDF (Ukrainian)
Application of solutions to the Thiele–Hermite problem for expanding the functions tg $z$, ctg $z$, th $z$, and cth $z$, in continued fractions

Yu. Myslo, M. Pahirya

727–742
- Requires Subscription PDF (Ukrainian)
Explosion and implosion of continuous-time birth-and-death random walks

A. Pilipenko, V. Tkachenko

743–756
- Requires Subscription PDF (Ukrainian)
Solvability of linear boundary-value problems for ordinary high-order differential systems in the spaces of continuously differentiable functions

V. Soldatov

757–769
- Requires Subscription PDF (Ukrainian)
On the exponential-power growth at infinity of homeomorphisms of certain classes

M. Stefanchuk

770–785
- Requires Subscription PDF (Ukrainian)
On the logarithmic growth of entire series in a system of functions

M. Sheremeta, O. Holovata, O. Mulyava

786–797
- Requires Subscription PDF (Ukrainian)
On the growth of $m$-th $(m\geq 1)$ derivatives of algebraic polynomials in the whole complex plane for the domains with cusps

Fahreddin G. Abdullayev, Pelin Özkartepe

798–799
- Requires Subscription URL
Sharp results on the logarithmic coefficients for the classes $\mathcal{S}^{*}_S$ and $\mathcal{K}_S$

Molla Basir Ahamed, Sanju Mandal

800
- Requires Subscription URL
Fractal Hamiltonian systems

Bilender P. Allahverdiev, Hüseyin Tuna

801
- Requires Subscription URL
2-Local ring derivations on nest algebras determined through rank-one operators

Moin A. Ansari

802–803
- Requires Subscription URL
On a class of univalent functions defined using the Sǎlǎgean differential operator with square-root component of the derivative

Mihai Aron

804–805
- Requires Subscription URL
Discussion on the fractional Bullen estimation for twice-differentiable functions in the context of non-Newtonian calculus

Bouharket Benaissa

806–807
- Requires Subscription URL
On gradient generalized $\vartheta$-$\eta$-Ricci solitons with applications in space-times

Rajdip Biswas, Santu Dey, Young Jin Suh, Arindam Bhattacharyya

808–809
- Requires Subscription URL
Lagrangian extensions and left-symmetric structures on the four-dimensional real Lie superalgebras

Sofiane Bouarroudj, Ana-Maria Radu

810
- Requires Subscription URL
A new Grünwald–Letnikov operator using a continuous positive function

Martha Paola Cruz de la Cruz, Daniel Alfonso Santiesteban, José María Sigarreta

811–812
- Requires Subscription URL
Exact controllability and stability analysis for implicit fractional differential equations

Okan Duman

813–814
- Requires Subscription URL
Some inclusion properties for the class of $q$-calculus operators

R. M. El-Ashwah, W. Y. Kota

815
- Requires Subscription URL
The generalized inverse of the quaternion tensor via the M-product

Hongwei Jin, Yuzhen Wang, Shaowu Huang, Vasilios N. Katsikis

816–817
- Requires Subscription URL
On geometric properties of the Ramanujan entire-type function and its Alexander transform

Khaled Mehrez, Abdulaziz Alenazi

818–819
- Requires Subscription URL
Chaki and Deszcz submanifolds of Kenmotsu manifolds

Tuğba Mert

820–821
- Requires Subscription URL
Statistical convergence of Borel measurable functions at infinity via measure and modulus functions of order $\alpha$

Alifa Othman Aljamili, Mehmet Küçükaslan

822–823
- Requires Subscription URL
Spectral properties of zero divisor graphs of commutative rings

Bilal Ahmad Rather, Parvez Ali, Muhammed Imran, Zahid Raza

824–825
- Requires Subscription URL
Analytic resolvent approach to $\Psi$-fractional control systems with linear closed operators

Abdelmajid Salhi, Ali El Mfadel, Said Melliani

826–827
- Requires Subscription URL
Characterizations of weighted Triebel–Lizorkin spaces with variable smoothness and integrability

Shengrong Wang, Pengfei Guo, Jingshi Xu

828
- Requires Subscription URL
Characterization of the $(\kappa,\mu)$-space with Boeckx invariant $I=\pm1$

Yaning Wang, Tianci Liu, Miaojing Hou

829
- Requires Subscription URL
Orthogonality of $\mathfrak{p}$-angular distance in relation to double-parametric integrals

Jinyu Xia, Qi Liu, Yuxin Wang, Man Liang, Silvestru Sever Dragomir

830–831
- Requires Subscription URL
Entire solutions of a differential-difference equation of certain type and the differential-difference analog of the Brück conjecture

Junfeng Xu, Sujoy Majumder, Debabrata Pramanik

832–833
- Requires Subscription URL

Chronicles

International conference “Approximation Theory of Functions and Related Problems” on the occasion of the 70 th birthday of Prof. Anatolii Romaniuk

834–836
- PDF (Ukrainian)

Vol. 78 No. 9-10 (2026)

Research articles

Lie and point symmetries of Nyzhnyk models

Stability under perturbations of $\pi$-fraction approximants

Bounded solutions of a bilateral difference equation with unbounded piecewise constant operator coefficients

A problem with exponential integral conditions for a factorized partial differential equation

Application of solutions to the Thiele–Hermite problem for expanding the functions tg $z$, ctg $z$, th $z$, and cth $z$, in continued fractions

Explosion and implosion of continuous-time birth-and-death random walks

Solvability of linear boundary-value problems for ordinary high-order differential systems in the spaces of continuously differentiable functions

On the exponential-power growth at infinity of homeomorphisms of certain classes

On the logarithmic growth of entire series in a system of functions

On the growth of $m$-th $(m\geq 1)$ derivatives of algebraic polynomials in the whole complex plane for the domains with cusps

Sharp results on the logarithmic coefficients for the classes $\mathcal{S}^{*}_S$ and $\mathcal{K}_S$

Fractal Hamiltonian systems

2-Local ring derivations on nest algebras determined through rank-one operators

On a class of univalent functions defined using the Sǎlǎgean differential operator with square-root component of the derivative

Discussion on the fractional Bullen estimation for twice-differentiable functions in the context of non-Newtonian calculus

On gradient generalized $\vartheta$-$\eta$-Ricci solitons with applications in space-times

Lagrangian extensions and left-symmetric structures on the four-dimensional real Lie superalgebras

A new Grünwald–Letnikov operator using a continuous positive function

Exact controllability and stability analysis for implicit fractional differential equations

Some inclusion properties for the class of $q$-calculus operators

The generalized inverse of the quaternion tensor via the M-product

On geometric properties of the Ramanujan entire-type function and its Alexander transform

Chaki and Deszcz submanifolds of Kenmotsu manifolds

Statistical convergence of Borel measurable functions at infinity via measure and modulus functions of order $\alpha$

Spectral properties of zero divisor graphs of commutative rings

Analytic resolvent approach to $\Psi$-fractional control systems with linear closed operators

Characterizations of weighted Triebel–Lizorkin spaces with variable smoothness and integrability

Characterization of the $(\kappa,\mu)$-space with Boeckx invariant $I=\pm1$

Orthogonality of $\mathfrak{p}$-angular distance in relation to double-parametric integrals

Entire solutions of a differential-difference equation of certain type and the differential-difference analog of the Brück conjecture

Chronicles

International conference “Approximation Theory of Functions and Related Problems” on the occasion of the 70 th birthday of Prof. Anatolii Romaniuk

Language

Information

Latest publications

Make a Submission

Vol. 78 No. 9-10 (2026)

Research articles

Chronicles

Language

Information

subscribe

Latest publications

Make a Submission