Recent Developments in Methods, Techniques, and Approaches to Study the Qualitative Properties of Differential Equations

A special issue of Axioms (ISSN 2075-1680). This special issue belongs to the section "Mathematical Analysis".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 5295

Special Issue Editors


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Guest Editor
School of Electrical and Electronic Engineering, University College Dublin, D04 V1W8 Dublin, Ireland
Interests: differential/difference equations; dynamical systems; modeling and stability analysis of electric power systems; mathematics of networks; fractional calculus; mathematical modeling (power systems, materials science, energy, macroeconomics, social media, etc.); optimization for the analysis of large-scale data sets; fluid mechanics; discrete calculus; Bayes control; e-learning
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Department of Mathematics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
Interests: differental equations; numerical analysis; analysis; applied mathematics; nonlinear dynamics; mathematical modelling; mathematical analysis; stability
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Guest Editor
Department of Mathematics, Faculty of Education, Ibb University, Ibb 999101, Yemen
Interests: differential and difference equations

Special Issue Information

Dear Colleagues,

Differential equations are a mathematical declaration containing one or more derivatives, terms describing the rate of change of quantities that differ continuously. They are used in a wide variety of disciplines, from biology, economics, physics, chemistry, can describe exponential growth and decay, the population growth of species, or the change in investment return over time. 

In modeling virtually any physical, scientific, or biological equation, differential equations play an important role. To understand these problems and phenomena, or at least to know the features of the solutions to these equations, solutions to differential equations are necessary. However, differential equations such as those discussed that are used to solve problems in real life may not be explicitly solvable, i.e. Do not have solutions in closed form. Solutions offered by explicit formulas are only accepted by equations of simple forms. Different models of differential equations have been developed in various sciences in recent decades, strongly encouraging research into the qualitative theory of differential equations.

Recently, it is easy to notice the huge amount of works concerned with studying the qualitative behavior of differential equations. Our aim in this issue is to select and publish works that contribute significantly to the development of the qualitative theory of ordinary and partial differential equations.

Prof. Dr. Ioannis Dassios
Dr. Osama Moaaz
Dr. Ali Muhib
Guest Editors

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Keywords

  • Ordinary differential equations ODEs
  • Partial differential equation PDEs
  • Delay differential equations DDEs
  • Difference equations
  • Approximation, numerical methods, numerical modeling of DEs
  • Asymptotic properties, stability, oscillation, boundedness, periodicity
  • Exact solution of PDEs
  • Physical applications of DEs
  • Engineering applications of DEs

Published Papers (3 papers)

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Research

10 pages, 277 KiB  
Article
New Sufficient Conditions for Oscillation of Second-Order Neutral Delay Differential Equations
by Taher S. Hassan, Osama Moaaz, Amany Nabih, Mouataz Billah Mesmouli and Ahmed M. A. El-Sayed
Axioms 2021, 10(4), 281; https://doi.org/10.3390/axioms10040281 - 28 Oct 2021
Cited by 5 | Viewed by 1229
Abstract
In this work, new sufficient conditions for the oscillation of all solutions of the second-order neutral delay differential equations with the non-canonical operator are established. Using a generalized Riccati substitution, we obtained criteria that complement and extend some previous results in the literature. [...] Read more.
In this work, new sufficient conditions for the oscillation of all solutions of the second-order neutral delay differential equations with the non-canonical operator are established. Using a generalized Riccati substitution, we obtained criteria that complement and extend some previous results in the literature. Full article
10 pages, 302 KiB  
Article
Criteria for the Oscillation of Solutions to Linear Second-Order Delay Differential Equation with a Damping Term
by Osama Moaaz, Elmetwally M. E. Elabbasy, Jan Awrejcewicz and Aml Abdelnaser
Axioms 2021, 10(4), 246; https://doi.org/10.3390/axioms10040246 - 30 Sep 2021
Cited by 2 | Viewed by 1423
Abstract
The aim of this work is to present new oscillation results for a class of second-order delay differential equations with damping term. The new criterion of oscillation depends on improving the asymptotic properties of the positive solutions of the studied equation by using [...] Read more.
The aim of this work is to present new oscillation results for a class of second-order delay differential equations with damping term. The new criterion of oscillation depends on improving the asymptotic properties of the positive solutions of the studied equation by using an iterative technique. Our results extend some of the results recently published in the literature. Full article
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8 pages, 270 KiB  
Article
About Cogredient and Contragredient Linear Differential Equations
by Vasily Gorelov
Axioms 2021, 10(2), 117; https://doi.org/10.3390/axioms10020117 - 10 Jun 2021
Cited by 1 | Viewed by 1607
Abstract
The notions of cogredience and contragredience, which have great importance to the question of algebraic independence of linear differential equation solutions, are discussed in the paper. Conditions of equivalence of two definitions of cogredience and contragredience are found. Full article
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