Browsing Наукові праці by Title
Now showing items 120 of 308

A characterization of the uniform convergence points set of some convergent sequence of functions
(De Gruyter, 2021)We characterize the uniform convergence points set of a pointwisely convergent sequence of realvalued functions defined on a perfectly normal space. We prove that if $X$ is a perfectly normal space which can be covered ... 
Algorithms for studying the stability of linear systems with delay
(12th International Conference on Advanced Computer Information Technologies, 20220926)In this paper, an algorithm for researching the stability of linear systems using a computer is proposed. The stability of systems with delay is reduced to finding the limit conditions for the negatives of the real parts ... 
Approximate Solutions of One Abstract Cauchy Problem
(Springer, 2021)We find approximate solutions of the Cauchy problem for a differentialoperator equation of hyperbolic type with degeneration in a Hilbert space. In terms of these approximations, we give a characteristic of the Gevrey ... 
Approximation of a solution of boundary value problems for delay integrodifferential equations
(Сучасні проблеми прикладної математики та комп’ютерних наук. Збірник наукових праць, 202108)In the present note we study an approximate method of solving boundary value problems for delay integrodifferential equations based on approximation of the solution by cubic splines with defect two. 
Approximation of solutions of boundary value problems for integrodifferential equations of the neutral type using a spline function method
(2022)Boundary value problems for nonlinear integrodifferential equations of the neutral type are investigated. A scheme for approximating the boundary value problem solution using cubic splines of defect two is proposed and ... 
Approximation of Systems with Delay and Algorithms for Modeling Their Stability.
(20210915)In this paper, the schemes of approximation of linear systems with delays by spesial systems of ordinary differential equations are considered and the connections between their solutions are investigated. Numerical algorithms ... 
Approximation of systems with delay their stability
(Masaryk University, Brno, Czech Republic, 20220715)In this paper, the schemes of approximation of linear systems with delays by special systems of ordinary differential equations are considered and the connections between their solutions are investigated. This allowed ... 
Approximation schemes for differential functional equations and algorithms their applications
(Vasyl Stefanyk Precarpathian National University, 20220515)Using the approximate finding algorithms for nonasymptotic roots of quasipolynomials, a way for construct ing the coefficient areas of stability for linear differential equations with delay and finding the set of delay ... 
Approximation schemes for differential functional equations and their applications
(Чернівецький національний університет, 20220924)The obtained algorithms for finding nonasymptotic quasipolynomial roots and constructing regions of stability of linear delay differential equations can be used to study applied problems of optimal control, modeling of ... 
Approximations chemes for differential functional equations and algorithms their applications.
(THE INTERNATIONAL ONLINE CONFERENCE “CURRENT TRENDS IN ABSTRACT AND APPLIED ANALYSIS” Book of Abstracts IvanoFrankivsk, Ukraine May 1215, 2022.  P. 1819, 20220512) 
ASYMPTOTICS OF SOLUTIONS OF DIFFUSION STOCHASTIC DIFFERENTIALFUNCTIONAL SYSTEMS WITH A SMALL PARAMETER UNDER THE ACTION OF EXTERNAL RANDOM VARIABLES
(SWorldJournal, 2022)The paper considers averaging in stochastic differential equations without aftereffects under the action of external fixed random variables. Then this technique of proofs is transferred to ... 
ASYMPTOTICS OF SOLUTIONS OF DIFFUSION STOCHASTIC DIFFERENTIALFUNCTIONAL SYSTEMS WITH A SMALL PARAMETER UNDER THE ACTION OF EXTERNAL RANDOM VARIABLES
(SWorldJournal, 2022)The paper considers averaging in stochastic differential equations without aftereffects under the action of external fixed random variables. Then this technique of proofs is transferred to averaging for stochastic ... 
BIFURCATION OF CYCLES IN PARABOLIC SYSTEMS WITH WEAK DIFFUSION
(Yuriy Fedkovych Chernivtsi National University, 20220922)We prove the existence of periodic solutions of an autonomous parabolic system of differential equations with retarded argument and weak diffusion on a circle. We study the existence and stability of an arbitrarily large ... 
Classical Solutions of the Equation of Local Fluctuations of Riesz Gravitational Fields and their Properties
(2022)We consider a pseudodifferential equation involving the Riesz operator of fractional differentiation, which is a natural generalization of the wellknown equation of fractal diffusion. The fundamental solution of the Cauchy ... 
Compactness and completeness in partial metric spaces
(Topology and its Applications, 20200201)We analyze compactnesslike properties of sets in partial metric spaces and obtain the equivalence of several forms of the compactness for partial metric spaces. Moreover, we give a negative answer to a question from [8] ... 
COMPARISON OF MACHINE LEARNING ALGORITHMS FOR PREDICTING MORTALITY FROM COVID19 VIRUS
(SWorldJournal, 2022)The article compares the effectiveness of Machine Learning Algorithms on the example of Covid19 distribution data. The following Machine Learning algorithms are considered: Logistic Regression, Support Vector ... 
Construction of stability domains for linear differential equations with delay
(SWorldJournal, 20230531)The aim of the present article is to investigate of solutions stability of linear autonomous differential equations with retarded argument. It is obtained the necessary and sufficient conditions, for all the roots of the ... 
CONSTRUCTION OF STABILITY DOMAINS FOR LINEAR DIFFERENTIAL EQUATIONS WITH SEVERAL DELAYS
(Yuriy Fedkovych Chernivtsi National University, 20221121)The aim of the present article is to investigate of solutions stability of linear autonomous differential equations with retarded argument. The investigation of stability can be reduced to the root location problem for the ... 
Construction of stability domains for linear differentialdifference equations
(National Academy of Sciences of Ukraine, 201207)We investigate the boundedness conditions and the methods of construction of a stability domain of linear differential equations with several delays.