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International Conference
of Young Mathematicians

June 3–5, 2021
Institute of Mathematics of NAS of Ukraine (online),
Kyiv, Ukraine

Preliminary List of Participants

Algebra, Geometry and Topology
Differential Equations and Mathematical Physics
Probability and Statistics
Theory of Functions and Functional Analysis
Applied and Computational Mathematics

Algebra, Geometry and Topology

Abbas Shabnam (Aligarh Muslim University, India)
On Dominions and Closed Varieties of Semigroups

Alagöz Yusuf (Siirt University, Department of Mathematics, Siirt, Turkey)
Pure injective dimensions relative to classes of finitely presented modules

Alam Rizwan (Aligarh Muslim University, India)
On Closedness of Rectangular Bands and left [right] Normal Bands

Alossaimi Maram (Sheffield University, United Kingdom)

Ashraf Wajih (Aligarh Muslim University, India)
On closed varieties of left [right] normal bands

Bilyi Illia (National University of “Kyiv-Mohyla Academy”, Ukraine)
Locally-zero binary operations as elements of Bin(X)

Cabardo Lyster Rey (MSU-ILigan Institute of Technology, Iligan City, Philippines)
Hyper BN-algebras: Hyperstructure Theory Applied to BN-algebras

Coşkun Tuncay (Süleyman Demirel University, Isparta, Turkey)
On the parallel surfaces to canal surfaces

Chupordia Vasyl (Oles Honchar Dnipro National University,
On abnormal fuzzy subgroups

Deng Jialong (Mathematisches Institut, Georg-August-Universität, Göttingen, Germany)
Weighted Scalar Curvature

Dikarev Andrei (Masaryk University, Czech Republic)
On holonomy of Weyl connections in Lorentzian signature

Dipen Ganguly (Department of Mathematics, Jadavpur University, India)
On trans-Sasakian 3-manifolds as eta-Einstein solitons

Dolores-Cuenca Eric Rubiel (NewSci Labs, United States)
Power series represented by posets

Doroshenko Svitlana (Taras Shevchenko National University of Kyiv, Ukraine)
On commensurators of groups in their Cayley graphs

Eftekharinasb Kaveh (Institute of Mathematics of NAS of Ukraine, Ukraine)
On generalization of Levy-Hadamard theorem

Feshchenko Bohdan (Institute of Mathematics of NAS of Ukraine, Ukraine)
Deformations of circle-valued Morse functions on 2-torus

Heneralov Mykola (V. N. Karazin Kharkiv National University, Ukraine)
Implicit difference equations over some residue class rings

Karvatsky Dmytro (Institute of Mathematics of NAS of Ukraine, Ukraine)
Achievement sets of multigeneralized Fibonacci sequence

Khomych Yuliia (Odessa I. I. Mechnikov National University, Ukraine)
QA-deformation of surface with the given law of changing variation of the unit normal vector

Kuznietsova Iryna (Institute of Mathematics of NAS of Ukraine, Ukraine)
Realization of groups as fundamental groups of orbits of smooth functions

Lutsenko Alla (Vasyl' Stus Donetsk National University, Ukraine)
The bunch of varieties of mirror group isotopes

Maloid-Hliebova Marta (Ivan Franko National University of Lviv, Ukraine)
About the second spectrum of a multiplication module

Mokhtari Amir Hossein (Techninal faculty of Ferdows, University of Birjand, Iran)
On maps on triangular algebras

Mehsin Jabel Atteya (School of Mathematics and Actuarial Science, University of Leicester, United Kingdom)
Symmetric n-Homo-antisemigeneralized semiderivation of rings

Melnyk Ivanna (Ivan Franko National University of Lviv, Ukraine)
On differentially prime semiring ideals

Nikitchenko Oleksii (National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine)
Homotopy types of striped surfaces

Osipchuk Tetiana (Institute of Mathematics of NAS of Ukraine, Ukraine)
Some topological properties of generalized convex sets

Petrov Evgeniy (Institute of Applied Mathematics and Mechanics of the NAS of Ukraine, Ukraine)
On a generalization of the Tukia-Väisälä inequality

Plakosh Andriana (Institute of Mathematics of NAS of Ukraine, Ukraine)
Chernikov 2-groups with Kleinian top and totally reducible bottom

Popovych Dmytro (Taras Shevchenko National University of Kyiv, Ukraine)
Chains of subalgebras in contracted Lie algebras

Pypka Aleksandr (Oles Honchar Dnipro National University, Ukraine)
Some analogs of group-theoretical results for Poisson algebras

Pyrch Nazar(Ukrainian Academy of Printing, Lviv Polytechnic National University)
Universal M-equivalence

Raievska Iryna (Institute of Mathematics of NAS of Ukraine, Ukraine)
Local nearrings on finite Abelian groups

Raievska Maryna (Institute of Mathematics of NAS of Ukraine, Ukraine)
Local nearrings on finite Abelian groups

Soroka Yulya (Institute of Mathematics of NAS of Ukraine, Ukraine)
Realization of groups as fundamental groups of orbits of smooth functions

Sydorov Maksym (Taras Shevchenko National University of Kyiv, Ukraine)
Darboux polynomials for derivations with a Jordan basis

Sysak Kateryna (National Transport University, Ukraine)
Darboux polynomials for derivations with a Jordan basis

Velychcko Tatyana (Oles Honchar Dnipro National University, Ukraine)
On the structure of some non-periodic groups whose subgroups of infinite special rank are transitively normal

Yashchuk Viktoriia (Oles Honchar Dnipro National University, Ukraine)
On the endomorphisms of some Leibniz algebras

Differential Equations and Mathematical Physics

Anop Anna (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
On elliptic problems with boundary data of low regularity in generalized Sobolev spaces

Atlasiuk Olena (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
On linear generic boundary-value problems for differential systems in Sobolev spaces

Bondarenko Kyrylo (Odessa I. I. Mechnikov National University, Odessa, Ukraine)
The dynamic problem for elastic quarter space

Charalambous Kyriakos (University of Cyprus, Nicosia, Cyprus)
The Lie symmetry approach on (1+2)-dimensional financial models

Chepok Olga (The state institution "South Ukrainian National Pedagogical University named after K. D. Ushynsky", Odessa, Ukraine)
$P_{\omega}(Y_0, Y_1, \pm \infty)$ - solutions of second-order differential equations with different types of nonlinearities

Chepurukhina Iryna (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
On elliptic problems with rough boundary data in the Nikolsky spaces

Diachenko Daria (Donbass state pedagogical university, Sloviansk, Ukraine)
Linear differential-algebraic boundary-value problem with impulse influence

Dmytryshyn Iryna (Institute of Applied Mathematics and Mechanics of the NAS of Ukraine, Sloviansk, Ukraine)
Determining the characteristics of an induction motor in case of incomplete information about the operation of its components

Fesenko Anna (Odessa I. I. Mechnikov National University, Odessa, Ukraine)
The dynamic problem for elastic quarter space

Filipkovska Maria (B. Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, Kharkiv, Ukraine)
Qualitative analysis of nonautonomous degenerate differential equations and nonlinear electrical circuits

Goncharuk Anna (V.N.Karazin Kharkiv National University, Kharkiv, Ukraine)
Non-homogeneous implicit linear differential equation over the ring of formal power series

Huzyk Nadiia (Hetman Petro Sahaidachnyi National Army Academy, Lviv, Ukraine)
Coefficient inverse problem for the parabolic equation with general weak degeneration

Kalinichenko Yaroslav (Donbass state pedagogical university, Sloviansk, Ukraine)
Weakly nonlinear difference-algebraic boundary-value problem in the case of parametric resonance

Koval Serhii (National technical university of Ukraine "Igor Sikorsky Kyiv Polytechnical Institute", Kyiv, Ukraine)
Symmetries of (2+1) dimensional Schrodinger-Pauli equation for charged particles

Kravets Viktoriia (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)
On the properties of bounded solutions of difference equations with jumps of operator coefficients

Kuduk Grzegorz (University of Rzeszow, Rzeszow, Poland)
Integral problem for system of linear partial differential equation

Kuz Anton (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine, Lviv, Ukraine)
Integral problem with respect to time for PDE with Bessel opereators

Kuzmina Vlada (Donbass state pedagogical university, Sloviansk, Ukraine)
Weakly nonlinear integral-differential boundary-value problems

Lachouri Adel (University of Annaba, Annaba, Algeria)
Nonlinear fractional Langevin integro-differential equations involving two fractional orders with boundary conditions

Lokaziuk Oleksandra (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
Group classification of (1+1)-dimensional generalized nonlinear Klein--Gordon equations

Mendi Melis (Yildiz Technical University, Istanbul, Turkey)
Lie Symmetry analysis of the coupled system of sine-Gordon equations

Negrych Maria (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine, Lviv, Ukraine)
On nonlocal problem for the equation with the operator of generalized differentiation

Nesmelova Olga (Institute of Applied Mathematics and Mechanics of the NAS of Ukraine, Sloviansk, Ukraine)
Weakly nonlinear boundary-value problems for degenerate differential-algebraic systems

Otarova Jamila (Karakalpak state university named after Berdakh, Nukus, Uzbekistan)
On solution the boundary value problem of the fourth-order equation with nonlocal conditions

Pelekhata Olha (National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine)
Conditions of continuity in a parameter of solutions of one-dimensional boundary-value problems

Pokutnyi Oleksandr (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
Dichotomy and bounded solutions of dynamical systems in the Banach and Hilbert spaces

Rybalko Yan (B.Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, Kharkiv, Ukraine)
Long-time evolution of the shifted step initial data for the nonlocal nonlinear Schrodinger equation

Satur Oksana (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
Limit cycles in models of conflict dynamic systems

Skorobohach Tetiana (National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»)
On Fredholm boundary-value problems with a parameter in the Sobolev- Slobodetskii spaces

Soldatov Vitalii (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
About approximation properties of solutions to multipoint boundary-value problems

Strakh Oleksandr (Sumy State A.S.Makarenko Pedagogical University, Sumy, Ukraine)
Solving dynamic systems on fractal sets

Vaneeva Olena (Institute of Mathematics of the NAS of Ukraine, Kyiv, Ukraine)
Generalization of the algebraic method of group classification

Yevgenieva Yevgeniia (Institute of Applied Mathematics and Mechanics of the NAS of Ukraine, Sloviansk, Ukraine)
Very singular and large solutions of semilinear elliptic equations with degenerate absorption

Zawora Bartosz (University of Warsaw, Warsaw, Poland)
A time-dependent energy momentum method

Probability and Statistics

Abdushukurov Fazikhuddin (Yeoju Technical Institute In Tashkent)
Limit theorems in allocation scheme with even number of particles in each cell

Afanasiev Ievgenii (B. Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine)
On the Correlation Functions of the Characteristic Polynomials of Real Random Matrices with Independent Entries

Avetisian Diana (Taras Shevchenko National University of Kyiv)
Asymptotic properties of the Hurst and diffusion parameters estimators in fractional stochastic heat equation

Belozerowa M. A. (Odessa I. I. Mechnikov National University)
Asymptotic behavior of solutions to stochastic differential equations with interaction

Djordjević Dušan (University of Niš)
Lp and almost sure convergence of an approximate method based on the Taylor expansion of the coefficients of Stochastic Differential Equations with Time-Dependent Delay

Karnaukh Ievgen (Oles Honchar Dnipro National University)
On the distribution of the first passage time over state-dependent levels for a Markov modulated Kou process

Konarovskyi Vitalii (Institute of mathematics of NAS of Ukraine)
Stochastic block model in a new critical regime

Mamalyha Khrystyna (Vasyl Stefanyk Precarpathian National University)
Single layer potentials for pseudo-differential equations related to certain α-stable stochastic processes

Marx Victor (Leipzig University)
On the spectral gap for Brownian motion on domains with sticky-reflecting boundary diffusion

Mazhar Bohdan (National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”)
Hausdorff dimension of clusters generated by stationary Loewner evolutions

Melekestseva Alisa (Taras Shevchenko National University of Kyiv)
Forecasting of demographic indices via splines

Petrovic Aleksandra, Milošević Marija (University of Niš)
Lq-convergence of the truncated Euler-Maruyama approximate solutions for a class of highly nonlinear neutral stochastic differential equations with time-dependent delay.

Rashytov Bohdan (Taras Shevchenko National University of Kyiv)
Development of renewal theory for the early generations of an iterated perturbed random walk on a general branching process tree

Riabov Georgii (Institute of Mathematics of NAS of Ukraine)
Constructing coalescing stochastic flows

Sylenko Illia (National University Of Kyiv-Mohyla Academy)
Construction of Nash equilibrium in a non-symmetric resource extraction game

Zhelezniak Hanna (Taras Shevchenko National University of Kyiv)
Additional singularity of a kernel in an approximate estimate of parameters

Theory of Functions and Functional Analysis

Barış Akay (Istanbul University, Department of Mathematics)
Vector lattices of almost L-weakly and almost M-weakly compact operators

Iryna Bilanyk (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU)
Parabolic convergence domain of branched continued fraction of the special form

Viktoriia Bilet (Institute of Applied Mathematics and Mechanics of the NASU, Sloviansk)
About connection between eta-quasisymmetric homeomorphisms and K-quasiconformal mappings on Riemannian manifolds

Iryna Denega (Institute of Mathematics of NAS of Ukraine)
Estimates of the products of inner radii

Begüm Çalışkan Desova (Yeditepe University)
p-Komlo ́s properties

Bogdan Djordjevic (Mathematical Institute of the Serbian Academy of Sciences and Arts)
Singular Lyapunov operator equation: applications to abstract Cauchy problems

Mykola Dudkin (National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”)
Singularly nonymmetrically finite rank perturbations H_{-1}-class of self-adjoint operator

Beyaz Basak Eskisehirli (Department of Mathematics, Istanbul University)
An invertibility and Fredholm criteria in C*-algebra acting on the Hardy space on the unit disc and the polydisc

Oksana Fedunyk-Yaremchuk (Lesya Ukrainka Volyn National University)
Approximative characteristics of the Nikol'skii-Besov-type classes of periodic functions of several variables

Eduard Stefan Grigoriciuc (Department of Mathematics, Babes-Bolyai University, Cluj-Napoca, Romania)
On some results concerning convex sum of biholomorphic mappings in $С^n.$

Mykola Haievskyi (Volodymyr Vynnychenko Central Ukrainian State Pedagogical University)
Approximation of functions in Bergman spaces

Svitlana Hembars'ka (Lesya Ukrainka Volyn National University)
Approximative characteristics of the Nikol'skii-Besov-type classes of periodic functions of several variables

Mykhailo Hembars'kyi (Lesya Ukrainka Volyn National University)
Approximative characteristics of the Nikol'skii-Besov-type classes of periodic functions of several variables

Koba Ivanadze (Ivane Javakhishvili Tbilisi State University)
On generalized absolute continuity of functions

Bogdan Klishchuk (Institute of Mathematics of NAS of Ukraine)
Asymptotic estimates for ring Q-homeomorphisms with respect to p-modulus

Oleg Kovalenko (Oles Honchar Dnipro National University)
On multivariate Ostrowski type inequalities and their applications

Oleksandr Kozynenko (Oles Honchar Dnipro National University)
Adaptive approximation by sums of piecewise polynomials on sparse grids

Atanu Manna (Indian Institute of Carpet Technology, Bhadohi)
Walker's approach to some Hardy-type integral inequalities

Qasim Mohd (Baba Ghulam Shah Badshah University Rajouri)
A New Construction of Lupas Operator and its Approximation Properties

Kateryna Pozharska (Institute of Mathematics of NAS of Ukraine)
Optimal recovery of multivariate functions from reproducing kernel Hilbert spaces

Oleksandr Pozharskyi (Institute of mathematics of NAS of Ukraine)
Estimates of the recovery error for continuous on the square functions by noisy linear information

Michael Quellmalz (TU Berlin)
The Fourier diffraction theorem in optical tomography

Sofiia Ratushniak (Institute of Mathematics of NAS of Ukraine)
Inversor of digits of Q_2^*-representation of numbers

Victoria Shkapa (State University of Telecommunications)
Best orthogonal trigonometric approximations on the classes of periodic multivariate functions in the uniform norm

Mariia Stefanchuk (Institute of Mathematics of NAS of Ukraine)
About local behavior of the nonlinear Cauchy-Riemann-Beltrami system

Hanna Vlasyk (State University of Telecommunications)
Best orthogonal trigonometric approximations on the classes of periodic multivariate functions in the uniform norm

Viktoriia Voloshyna (Taras Shevchenko National University of Kyiv)
Approximation of the periodical functions by trigonometric polynomials preserving the sign

Liudmyla Vyhivska (Institute of mathematics of NAS of Ukraine)
Problem on extremal decomposition of the complex plane with free poles

Iryna Zamrii (State University of Telecommunications)
Best orthogonal trigonometric approximations on the classes of periodic multivariate functions in the uniform norm

Shalva Zviadadze (Ivane Javakhishvili Tbilisi State University)
On the divergence of the Fourier series with respect to uniformly bounded orthonormal systems in the spaces close to L^1

Applied and Computational Mathematics

Aled Williams (Cardiff University)
Distances to and the sparsity of lattice points in knapsack polytopes

Chernetska Liliia (Institute of mathematics of NAS of Ukraine)
Two-dimensional generalized moment representations and Padé approximants for pseudo-twovariate functions

Dmytruk Max (Vasyl’ Stus Donetsk National University)
An algorithm for contracting Latin cubes

Kozachenko Karina (Odessa State Academy of Civil Engineering and Architecture)
Motion of a rigid body under the action of a small control moments

Lahodzinskyi Oleksandr (Institute of mathematics of NAS of Ukraine)
Resonant three-dimensional steady-state resonant sloshing in square-base tank for arbitrary periodic nonparametric forcing

Lakhlifa Sadek (Faculty of Science, Chouaib Doukkali University)
Numerical methods for solving large-scale systems of differential equations

Matviychuk Ruslana (Vasyl’ Stus Donetsk National University)
An algorithm for contracting Latin cubes

Raynovskyy Ihor (Institute of mathematics of NAS of Ukraine)
Steady-state resonant sloshing in a circular base container for arbitrary periodic orbital motions with consideration of damping

Süleyman Cengizci (Middle East Technical University)
SUPG-stabilized finite element formulation of shallow‐water equations

Vuk Vujović (Faculty of Sciences and Mathematics, University of Niš)
Stochastic Hepatitis C model with an isolation stage