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De la Vallée Poussin inequality for impulsive differential equations

  • Sibel Doğru Akgöl EMAIL logo and Abdullah Özbekler
Published/Copyright: August 1, 2021
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Abstract

The de la Vallée Poussin inequality is a handy tool for the investigation of disconjugacy, and hence, for the oscillation/nonoscillation of differential equations. The results in this paper are extensions of former those of Hartman and Wintner [Quart. Appl. Math. 13 (1955), 330–332] to the impulsive differential equations. Although the inequality first appeared in such an early date for ordinary differential equations, its improved version for differential equations under impulse effect never has been occurred in the literature.

In the present study, first, we state and prove a de la Vallée Poussin inequality for impulsive differential equations, then we give some corollaries on disconjugacy. We also mention some open problems and finally, present some examples that support our findings.

MSC 2010: 34A37; 34A40

aozbekler@gmail.com


  1. (Communicated by Michal Fečkan)

Acknowledgement

The authors would like to express their sincere gratitude to the Anonymous Referees for their valuable comments and helpful suggestions.

References

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Received: 2020-09-04
Accepted: 2020-10-05
Published Online: 2021-08-01
Published in Print: 2021-08-26

© 2021 Mathematical Institute Slovak Academy of Sciences

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