## Periodic boundary value problem for the first order impulsive functional differential equations.(English)Zbl 1123.34050

Assuming the existence of a lower solution $$\alpha$$ and an upper solution $$\beta$$ such that $$\alpha\leq\beta$$ with the usual order, the monotone iterative technique is used to show that the periodic boundary value problem for a class of first-order differential equations with delay and impulses has the minimal and the maximal solutions in $$[\alpha,\beta]$$. For it, a new comparison result is proved.
Reviewer: Eduardo Liz (Vigo)

### MSC:

 34K10 Boundary value problems for functional-differential equations 34K07 Theoretical approximation of solutions to functional-differential equations 34K45 Functional-differential equations with impulses
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### References:

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