## The method of Lyapunov functionals and exponential stability of impulsive systems with time delay.(English)Zbl 1123.34065

Consider the system of functional differential equations with impulses $x'(t)=f(t,x_t),\, t\neq t_k,$
$x(t_k^+)-x(t_k^-)=I_k(t_k,x_{t_k^-}),\, k\in\mathbb{N},$
$x_{t_0}=\phi,$ where, as usual, $$x_t(s)=x(t+s),\, s\in[-\tau,0]$$. It is assumed that zero is a solution to this system.
Using Lyapunov-like functionals, sufficient conditions are found to prove that the trivial solution is exponentially stable. The paper also contains several examples; in particular, it is shown that an unstable linear delay-differential equation may become exponentially stable by adding a suitable impulsive (nondelayed) perturbation.
Reviewer: Eduardo Liz (Vigo)

### MSC:

 34K45 Functional-differential equations with impulses 34K20 Stability theory of functional-differential equations
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### References:

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