# International Conference of Young Mathematicians

## Preliminary List of Participants

Algebra, Number Theory and Combinatorics

Abramov Artemii (Institute of Mathematics of NAS of Ukraine)
Semi-distributive nearrings with identity

Bondarenko Ievgen (Taras Shevchenko National University of Kyiv, Ukraine)
Growth functions of initial Mealy automata

Bortosh Maria (Uzhhorod National University, Ukraine)
On $(*,2)$-reducible $t$-monomial matrices over a commutative local ring

Çınarcı Burcu (Piri Reis University, Istanbul, Turkey)
Derived length and character degrees

Chitaia Irakli (Ivane Javakhishvili Tbilisi State University, Georgia)
Algebraic structures related to Q-reducibility

Kozerenko Sergiy (National University of Kyiv-Mohyla Academy, Ukraine)
Extremal size graphs in Seidel's switching classes

Krainichuk (Shelepalo) Halyna (Vasyl Stuts Donetsk National University, Vinnytsia, Ukraine)
Classification function equations and identities of the length three

Laver Vasyl (Uzhhorod National University, Ukraine)
Rota-type Operators on a Commutative Modular Group Algebra

Melnyk Ivanna (Ivan Franko National University of Lviv, Ukraine)
Quasi-prime differential subsemimodules

Plakosh Andriiana (Institute of Mathematics of NAS of Ukraine)

Pypka Oleksandr (Oles Honchar Dnipro National University, Ukraine)
“Antinormality” in groups

Raievska Iryna (Institute of Mathematics of NAS of Ukraine)
Finite dihedral groups as the additive groups of nearrings with identity

Raievska Maryna (Institute of Mathematics of NAS of Ukraine)
Finite dihedral groups as the additive groups of nearrings with identity

Sysak Kateryna (National transport university, Ukraine)
Infinite dimensional solvable Lie algebras of derivations on polynomial rings in two variables

Williams Aled (Cardiff University, Great Britain)
Distances to Lattice Points in Rational Polyhedra

Yashchuk Viktoriia (Oles Honchar Dnipro National University, Ukraine)
On the structure of Leibniz algebras having only two types of subalgebras

Differential Equations and Mathematical Physics

Ahmed Mahdi Ahmed (King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)
Long-time behavior of solutions for a nonlinear fractional integro-differential problem

Allahem Ali (Qassim University, Saudi Arabia)
Existence of positive solutions of nonlocal $p(x)$-Kirchhoff evolutionary systems via sub-super solutions concept

Anop Anna (Institute of Mathematics of NAS of Ukraine)
About Lawruk elliptic boundary-value problems for homogeneous differential equations

Atlasiuk Olena (Institute of Mathematics of NAS of Ukraine)
Limit theorems for solutions of multipoint boundary-value problems in Sobolev spaces

Bondar Ivanna (Institute of Mathematics of NAS of Ukraine)
Weakly nonlinear boundary value problems for systems of integrodifferential equations with impulse action. Critical case of the second order

Chepok Olga (Odessa I. I. Mechnikov National University, Ukraine)
Asymptotic representations of some class of solutions with slowly varying derivatives of the second order differential equations with product of rapidly and regularly varying nonlinearities

Chepurukhina Iryna (Institute of Mathematics of NAS of Ukraine)
On the extended Sobolev scale on manifolds and its application to elliptic boundary-value problems

Chernikova Anastasiia (Odessa I. I. Mechnikov National University, Ukraine)
On The Asymptotics of Solutions of Essentially Nonlinear Differential Equations of the Second Order

Davydovych Vasyl' (Institute of Mathematics of NAS of Ukraine)
Mathematical model describing the interaction of different language speakers

Drozhzhyna Anastasiia (Odessa I. I. Mechnikov National University, Ukraine)
Asymptotic behavior of solutions of nonlinear differential equations

Filipkovska Maria (B. Verkin ILTPE of NAS of Ukraine; V.N. Karazin Kharkiv National University, Ukraine)
Existence, uniqueness and boundedness of global solutions of degenerate differential equations

Goriunov Andrii (Institute of Mathematics of NAS of Ukraine)
On approximation of the Sturm–Liouville operators with singular potentials

Grushkovskaya Victoria (Institute of Mathematics, Julius Maximilian University of Würzburg Germany; Institute of Applied Mathematics and Mechanics of NAS of Ukraine, Sloviansk)
On stabilization of nonlinear systems using gradient flow approximation

Heseleva Kateryna (Kamianets-Podilskyi National Ivan Ogiienko University, Ukraine)
The collocation-iterative method of solving a nonlinear integral equation with additional conditions

Hula Yaroslav (Odessa I. I. Mechnikov National University, Ukraine)
Asymptotic behaviour of solutions of second-order differential equations with rapidly varying nonlinearities

Ilkiv Volodymyr (Lviv Polytechnic National University, Ukraine)
Metric estimates for the determinant of the problem for periodic oscillations of a three strings bunch

Karakenova Sayakhat (Al-Farabi Kazakh National University, Kazakhstan)
On solution to the special Cauchy problem for Fredholm integro-differential equations with nonlinear integral part

Kasimova Nina (Taras Shevchenko National University of Kyiv, Ukraine)
Attainability Issue for Optimal Control Problem for Some Degenerate Variation Elliptic Inequality

Khoroshun Anatoliy (S.P. Timoshenko Institute of Mechanics, Ukraine)
On control construction for single-link manipulator with joint elasticity

Kliuchnyk Inna (Volodymyr Vynnychenko Central Ukrainian State Pedagogical University, Ukraine)
To the substantiation of the asymptotic method of the pulsed oscillatory system

Kuduk Grzegorz (University of Rzeszow, Poland)
Nonlocal problem for system of partial differential equations of first order

Kuz Anton (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Integral Problem with Respect to Time for Loaded Partial Differential Equation

Lahodzinskyi Oleksandr (Institute of Mathematics of NAS of Ukraine)
Sloshing in an orbitally-forced square-base tank

Lokaziuk Aleksandra (Institute of Mathematics of NAS of Ukraine)
Nonlinear second-order evolution equations with Lie symmetries algebras of maximal dimensions

Madjidi Fadila (University of Mohamed Boudiaf of M'sila, Algeria)
A Lyapunov inequality for fractional difference operators with discrete Mittag-Leffler kernel of order $2\leq\alpha < 5/2$

Martseniuk Vsevolod (V. N. Karazin Kharkiv National University, Ukraine)
Integer solutions of implicit linear difference equations of the second order

Masliuk Hanna (National Technical University of Ukraine "Igor Sikorsky Kyiv Politechnic Insitute", Ukraine)
On the one-dimensional boundary-value problems with parameter in Slobodetskii spaces

Mynbayeva Sandugash (K.Zhubanov Aktobe Regional State University, Institute of Mathematics and Mathematical Modeling, Kazakhstan)
Solvability of the special Cauchy problem for the system of nonlinear Fredholm integro-differential equations

Mykhasiuk Mykhailo (Uzhhorod National University, Ukraine)
Properties of the solution of the Cauchy problem for the heat equation on a plane with random factors from the Orlicz space

Myslo Yuliia (Uzhhorod National University, Ukraine)
Almost periodic solutions of Mackey-Glass equations with non-fixed moments of pulse action

Mysov Kostiantyn (Odesa I.I. Mechnikov National University, Odesa, Ukraine)
The wave field of the rotating cone

Negrych Maria (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Nonlocal problem for first order differential-operator equation with the operator of generalized differentiation

Nesterenko Maryna (Institute of Mathematics of NAS of Ukraine)
Contractions of realizations of Lie algebras

Novikova Yuliia (Donetsk National Technical University, Pokrovsk, Ukraine)
Control functionals for stabilization of a nonlinear mechanical system with two plates

Otarova Jamila (Karakalpak State University named after Berdakh, Uzbekistan)
Solvability of a boundary value problem for a fourth-order mixed type

Pelekhata Olha (National Technical University of Ukraine "Igor Sikorsky Kyiv Politechnic Insitute", Ukraine)
Limit theorems for solutions of linear boundary value problems for systems od differential equations

Pokutnyi Oleksandr (Institute of Mathematics of NAS of Ukraine)
Bounded solutions of nonlinear Lyapunov equation and homoclinic chaos

Pošta Severin (Czech Technical University in Prague, Czech Republic)
Contractions of realizations of Lie algebras

Raynovskyy Ihor (Institute of Mathematics of NAS of Ukraine)
Resonant three-dimensional sloshing in a cylindrical tank with damping. Steady-state solutions

Repetylo Sofiia (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Dirichlet-Neumann type problem for partial differential equation with delay argument

Satur Oksana (Institute of Mathematics of NAS of Ukraine)
The sure event problem in multi-component dynamical systems with attractive interaction

Sazonova Olena (V.N. Karazin Kharkiv National University, Ukraine)
Continual approximate solution of the Boltzmann equation with screw modes

Skovronska Ivanna (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Metric estimates for the determinant of the problem for periodic oscillations of a three strings bunch

Soldatov Vitalii (Institute of Mathematics of NAS of Ukraine)
On approximative properties of multipoint boundary-value problems

Strakh Oleksandr (Sumy State A. S. Makarenko Pedagogical University, Ukraine)
Systems of Integral Equations on Time Scales

Symotiuk Mykhailo (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Metric estimates for the determinant of the problem for periodic oscillations of a three strings bunch
Dirichlet-Neumann type problem for partial differential equation with delay argument

Taistra Yurii (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics, Ukraine)
On the problem for one-way null Maxwell field in the Kerr space-time

Tkachenko Evgen (Institute of Mathematics of NAS of Ukraine)
On acoustic equilibria

Tokmurzin Zhanubek (K.Zhubanov Aktobe Regional State University, Kazakhstan)
On the periodic problem for fourth order partial differential equations

Turchyna Nataliia (National Technical University of Ukraine "Igor Sikorsky Kyiv Politechnic Insitute", Ukraine)
On the correct solvability in Hölder spaces of growing functions of model boundary-value problems with and without initial conditions for an Eidelman parabolic system

Vaneeva Olena (Institute of Mathematics of NAS of Ukraine)
Normalized classes of quasilinear second-order evolution equations

Vasylieva Iryna (Institute of Applied Mathematics and Mechanics of NAS of Ukraine, Sloviansk, Ukraine)
Investigation of the stability of a nonholonomic mechanical system using stochastic processes of Sussmann type

Vaysfeld Natalya (Odesa I.I. Mechnikov National University, Odesa, Ukraine)
The wave field of the rotating cone

Verezhak Ganna (Yuriy Fedkovych Chernivtsi National University, Ukraine)
Nonlocal and multipoint with respect to time problem for evolution equations with the Bessel operator of infinite order

Vira Maryna (Nizhyn Gogol State University, Ukraine)
On asymptotic solution of the singular perturbed boundary-value problems for the linear systems of differential equation

Yevgenieva Yevgeniia (Institute of Applied Mathematics and Mechanics of NAS of Ukraine, Sloviansk, Ukraine)
Limiting profile of solutions for quasilinear parabolic equations with singular boundary data

Zelenska Irina (Volodymyr Vynnychenko Central Ukrainian State Pedagogical University, Ukraine)
The asymptotic solutions of singular perturbed systems of differential equations with first-order turning point

Zinenko Vladyslav (Institute of Mathematics of NAS of Ukraine)
Classification of low-dimensional Lie algebras and computation of their characteristics

Geometry and Topology

Bilet Viktoriia (Institute of Applied Mathematics and Mechanics of NAS of Ukraine, Sloviansk, Ukraine)
Finite tangent spaces at infinity and strong porosity at a point

von Dichter Katherina (Technische Universität München, Germany)
Asymmetric diameters

Eftekharinasab Kaveh (Institute of Mathematics of NAS of Ukraine)
Finslerian Geodesics On Frechet Manifolds

Feshchenko Bohdan (Institute of Mathematics of NAS of Ukraine)
Deformations of smooth functions on 2-torus

Karvatsky Dmytro (Institute of Mathematics of NAS of Ukraine)
Geometry of representation real numbers by incomplete sums of series, whose terms are generalized Fibonacci numbers

Khokhliyk Olexandra (Taras Shevchenko National University of Kyiv, Ukraine)
Diffeomorphism of 3 manifolds

Khomych Yuliia (Odessa I. I. Mechnikov National University, Ukraine)
On the existence and uniqueness QA-deformation of the Gaudi surface

Kravchenko Anna (Taras Shevchenko National University of Kyiv, Ukraine)
Automorphisms of Kronrod-Reeb graphs of Morse functios on 2-sphere

Kuznietsova Iryna (Institute of Mathematics of NAS of Ukraine)
First Betti numbers of orbits of Morse functions on surfaces

Podousova Tatyana (Odessa State Academy of Civil Engineering and Architecture, Ukraine)
A-deformations of surfaces with stationary lengths of LGT-lines and the Goursat problem

Soroka Yuliia (Institute of Mathematics of NAS of Ukraine)
First Betti numbers of orbits of Morse functions on surfaces

Zabka Matthew (Southwest Minnesota State University, USA)
Moduli Spaces of Morse Functions for Persistence

Probability and Statistics

Aiubova Nina (Taras Shevchenko National University of Kyiv, Ukraine)
Boundary theorems for one statistics of the Fractional Brownian process in the model of real observations

Dychko Halyna (Taras Shevchenko National University of Kyiv, Ukraine)
Nonparametric regression estimation for mixtures with varying concentrations

Fomichov Volodymyr (Institute of Mathematics of NAS of Ukraine)
Concentration of measure in stochastic flows

Kryvchenko Yuri (Odessa National Academy of Food Technologies, Ukraine)
Self-organized criticality in the theory of the nearest neighborhood of percolation systems elements

Miroshnychenko Vitalii (Taras Shevchenko National University of Kyiv, Ukraine)
Asymptotics of generalized least squares estimates for mixture of nonlinear regressions

Riabov Georgii (Institute of Mathematics of NAS of Ukraine)

Theory of Functions and Functional Analysis

Bandura Andriy (Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine)
Estimates of directional logarithmic derivative and distribution of zeros for functions analytic in the unit ball

Bilanyk Iryna (Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine)
Truncation error bounds of two-dimensional branched continued fractions of the special form in some angular domains

Chernetska Liliia (Institute of Mathematics of NAS of Ukraine)
Generalized moment representations and multidimensional multipoint Pade type approximations

Denega Iryna (Institute of Mathematics of NAS of Ukraine)
Inequalities for the inner radii of non-overlapping domains

Dvorak Inna (Institute of Mathematics of NAS of Ukraine)
Estimates of the products of inner radii for partially nonoverlapping domains of the complex plane

Kirka Diana (Vasyl Stus Donetsk National University, Vinnytsia, Ukraine)
Application of integral transformations in uniqueness theorems

Klishchuk Bogdan (Institute of Mathematics of NAS of Ukraine)
Asymptotics of solutions of nonlinear Beltrami equations

Kovalyov Ivan (Dragomanov National Pedagogical University, Kyiv, Ukraine)
Shift in the truncated indefinite Stieltjes moment problem

Kuznietsov Mykhailo (Taras Shevchenko National University of Kyiv, Ukraine)
The Ordering of Coexistence of Homoclinic Trajectories for Interval Maps

Maciaszek Krzysztof (Jagiellonian University, Kraków, Poland)
On polynomial extension property in n-disc

Markitan Vita (National Pedagogical Dragomanov University, Kyiv, Ukraine)

Pozharska Kateryna (Institute of Mathematics of NAS of Ukraine)
Entropy numbers of classes of periodic functions

Ratushniak Sofiia (Institute of Mathematics of NAS of Ukraine)
Density of sets of values of fractal functions related to $Q_2$-representation of real numbers

Salimov Ruslan (Institute of Mathematics of NAS of Ukraine)
Lower bounds for the area of the image of a sphere

Shkapa Victoria (State University of Telecommunications, Ukraine)
Estimates of the best orthogonal trigonometric approximations of functions of the classes $L_{\beta, p}^\psi$ in the uniform metric

Stefanchuk Mariia (Institute of Mathematics of NAS of Ukraine)
Asymptotics of solutions of nonlinear Beltrami equations

Sucu Sezgin (Ankara University, Turkey)
Approximation results of the sequence of operators involving generalized Appell polynomials

Tsyhanok Oksana (National Technical University of Ukraine "Igor Sikorsky Kyiv Politechnic Institute")
On the summability and convergence of series in the Banach space

Varma Serhan (Ankara University, Turkey)
Orthogonality of linear combinations of orthogonal polynomials: the general case

Vyhivska Liudmyla (Institute of Mathematics of NAS of Ukraine)
Estimates of the inner radii of symmetric non-overlapping domains

Yanchenko Sergii (Institute of Mathematics of NAS of Ukraine)
Approximative characteristics of functions from Nikol'skyi-Besov classes $S_{1,\theta}^{\boldsymbol{r}}B$

Zamrii Iryna (State University of Telecommunications, Kyiv, Ukraine)
Fractal properties of $(s-1)$-parametric family functions with the condition of inversion of $Q_s$-digits value of a function