A sharp oscillation criterion for a linear delay differential equation

2019 ◽  
Vol 93 ◽  
pp. 58-65 ◽  
Author(s):  
Ábel Garab ◽  
Mihály Pituk ◽  
Ioannis P. Stavroulakis
Keyword(s):  
Differential Equation ◽  
Delay Differential Equation ◽  
Oscillation Criterion ◽  
Linear Delay ◽  
Delay Differential

An Oscillation Criterion for First Order Linear Delay Differential Equations

1998 ◽  
Vol 41 (2) ◽  
pp. 207-213 ◽  
Author(s):  
CH. G. Philos ◽  
Y. G. Sficas
Keyword(s):  
Differential Equation ◽  
Differential Equations ◽  
Delay Differential Equation ◽  
Delay Differential Equations ◽  
Oscillation Criterion ◽  
Order Linear ◽  
First Order ◽  
Linear Delay ◽  
Delay Differential

AbstractA new oscillation criterion is given for the delay differential equation , where and the function T defined by is increasing and such that . This criterion concerns the case where .

scholarly journals A Sharp Oscillation Criterion for a Linear Differential Equation with Variable Delay

Symmetry ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1332 ◽  
Author(s):  
Ábel Garab
Keyword(s):  
Differential Equation ◽  
Delay Differential Equation ◽  
Continuous Functions ◽  
Oscillation Criterion ◽  
Variable Delay ◽  
All Solutions ◽  
Linear Differential ◽  
Delay Differential ◽  
Additive Form ◽  
Condition B

We consider linear differential equations with variable delay of the form x ′ ( t ) + p ( t ) x ( t − τ ( t ) ) = 0 , t ≥ t 0 , where p : [ t 0 , ∞ ) → [ 0 , ∞ ) and τ : [ t 0 , ∞ ) → ( 0 , ∞ ) are continuous functions, such that t − τ ( t ) → ∞ (as t → ∞ ). It is well-known that, for the oscillation of all solutions, it is necessary that B : = lim sup t → ∞ A ( t ) ≥ 1 e holds , where A : = ( t ) ∫ t − τ ( t ) t p ( s ) d s . Our main result shows that, if the function A is slowly varying at infinity (in additive form), then under mild additional assumptions on p and τ , condition B > 1 / e implies that all solutions of the above delay differential equation are oscillatory.

scholarly journals New Oscillation and Nonoscillation Criteria for a Class of Linear Delay Differential Equation

2019 ◽  
Vol 8 (10) ◽  
pp. 308-313
Keyword(s):  
Differential Equation ◽  
Continuous Function ◽  
Delay Differential Equation ◽  
Sufficient Condition ◽  
First Order ◽  
Linear Delay ◽  
Piecewise Continuous ◽  
Delay Differential ◽  
Oscillation And Nonoscillation Criteria ◽  
Oscillation And Nonoscillation

In this article the authors established sufficient condition for the first order delay differential equation in the form , ( ) where , = and is a non negative piecewise continuous function. Some interesting examples are provided to illustrate the results. Keywords: Oscillation, delay differential equation and bounded. AMS Subject Classification 2010: 39A10 and 39A12.

scholarly journals Steklov problem of the first class for a fractional order delay differential equation

2021 ◽  
pp. 30-37
Author(s):  
М.Г. Мажгихова
Keyword(s):  
Differential Equation ◽  
Green Function ◽  
Delay Differential Equation ◽  
Existence And Uniqueness ◽  
Function Method ◽  
Existence And Uniqueness Theorem ◽  
Green Function Method ◽  
Steklov Problem ◽  
Linear Delay ◽  
Delay Differential

Методом функции Грина получено решение задачи Стеклова первого класса для линейного уравнения с дробной производной Герасимова-Капуто с запаздывающим аргументом. Доказана теорема существования и единственности задачи. The solution to the Steklov problem with conditions of the first class for a linear delay differential equation with a Gerasimov-Caputo fractional derivative is obtained by Green function method. The existence and uniqueness theorem to the problem is proved.

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