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Asymptotic properties of one differential equation with unbounded delay

Zdeněk Svoboda (2012)

Mathematica Bohemica

We study the asymptotic behavior of the solutions of a differential equation with unbounded delay. The results presented are based on the first Lyapunov method, which is often used to construct solutions of ordinary differential equations in the form of power series. This technique cannot be applied to delayed equations and hence we express the solution as an asymptotic expansion. The existence of a solution is proved by the retract method.

Asymptotic relationship between solutions of two linear differential systems

Jozef Miklo (1998)

Mathematica Bohemica

In this paper new generalized notions are defined: Ψ -boundedness and Ψ -asymptotic equivalence, where Ψ is a complex continuous nonsingular n × n matrix. The Ψ -asymptotic equivalence of linear differential systems y ' = A ( t ) y and x ' = A ( t ) x + B ( t ) x is proved when the fundamental matrix of y ' = A ( t ) y is Ψ -bounded.

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