Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Vahid Roomi"'
Publikováno v:
Journal of Inequalities and Applications, Vol 2024, Iss 1, Pp 1-14 (2024)
Abstract The existence of solutions for a class of μ-Caputo fractional differential equations and an inclusion problem equipped with nonlocal μ-integral boundary conditions are investigated. We use F-contraction, convex F-contraction, and some cons
Externí odkaz:
https://doaj.org/article/02ecbada13834cacb4d1669d67747a19
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-20 (2024)
Abstract The objective of this study is to develop the $$\mathscr {S}\mathscr {E}\mathscr {I}\mathscr {A}\mathscr {R}\mathscr {S}$$ S E I A R S epidemic model for $$\mathscr {C}\mathscr {O}\mathscr {V}\mathscr {I}\mathscr {D}$$ C O V I D - $${\textbf
Externí odkaz:
https://doaj.org/article/fc42ec7e8a26451f840459a45699f1a5
Autor:
Vahid Roomi, Hamid Reza AHMADİ
Publikováno v:
Advances in the Theory of Nonlinear Analysis and its Applications, Vol 7, Iss 1, Pp 215-231 (2023)
In this work four uncertain delay differential equations of Volterra-Levin type will be considered. Applying suitable contraction mapping and fixed point method, the stability of the equations will be studied. It will be shown th
Externí odkaz:
https://doaj.org/article/49438370edb649749a1f3150967ca6ff
Autor:
Vahid Roomi, Hamid Ahmadi
Publikováno v:
Mathematics Interdisciplinary Research, Vol 7, Iss 3, Pp 249-260 (2022)
In this paper we study the dependence of solutions of uncertain initial value problems (UIVP) on the initial values. Introducing a contraction mapping and using Banach Fixed Point Theorem (BFPT), the existence and uniqueness (EaU) of solutions of the
Externí odkaz:
https://doaj.org/article/6e462c28cedb49728880800a7f3d3c59
Autor:
Vahid Roomi
Publikováno v:
Mathematics Interdisciplinary Research, Vol 6, Iss 4, Pp 243-256 (2021)
In the present work the oscillatory behavior of the solutions of a nonlinear generalization of Euler equation will be considered in which the nonlinearities satisfy the smoothness conditions which guarantee the uniqueness of s
Externí odkaz:
https://doaj.org/article/daa3781cf8bc48a386ce041cfb1005e3
Publikováno v:
Electronic Journal of Qualitative Theory of Differential Equations, Vol 2021, Iss 34, Pp 1-13 (2021)
The object of this paper is to study the existence and nonexistence of an important orbit in a generalized Liénard type system. This trajectory is doubly asymptotic to an equilibrium solution, i.e., an orbit which lies in the intersection of the sta
Externí odkaz:
https://doaj.org/article/0983b830d8cb4c269835e9b366b95ea3
Publikováno v:
Boletim da Sociedade Paranaense de Matemática, Vol 38, Iss 1 (2018)
In this work we use qualitative theory of differential equations to study the qualitative behavior of the solutions of a generalized Liénard system. Under quite general assumptions we present some sharp conditions under which the
Externí odkaz:
https://doaj.org/article/1beb788f93864121bf0f65c20a42a93f
Publikováno v:
Electronic Journal of Differential Equations, Vol 2013, Iss 185,, Pp 1-13 (2013)
We are concerned with the oscillatory behavior of the solutions of a generalized Euler differential equation where the nonlinearities satisfy smoothness conditions which guarantee the uniqueness of solutions of initial value problems, however, no con
Externí odkaz:
https://doaj.org/article/1b84a385f0394ed4a29279e20cd49148
Publikováno v:
Mathematics and Computers in Simulation. 194:64-79
It is well known that the mathematical biology and dynamical systems give very important information for the study and research of viral infection models such as HIV, HBV, HCV, Ebola and Influenza. This paper deals with the global dynamics of general
Publikováno v:
International Journal of Bifurcation and Chaos. 32
It is well known that dynamical systems are very useful tools to study viral diseases such as HIV, HBV, HCV, Ebola and Influenza. This paper focuses on a mathematical model of the cell-to-cell and the cell-free spread of HIV with both linear and nonl