, Volume 64, Issue 1, pp 83–97 | Cite as

Existence of positive periodic solutions of nonlinear neutral differential systems with variable delays

  • Hocine Gabsi
  • Abdelouaheb Ardjouni
  • Ahcene Djoudi


In this work we use some mixed techniques of the Mawhin coincidence degree theory and fixed point theorem to prove the existence of positive periodic solutions of delay systems. As a consequence, we offer existence criteria and sufficient conditions for existence of periodic solutions to the systems with feedback control. When these results are applied to some special delay bio-mathematics models, some new results are obtained, and many known results are improved.


Coincidence degree Fixed point theorem Positive periodic solutions Nonlinear neutral differential system Variable delay 

Mathematics Subject Classification

54H25 35B09 35B10 47H10 


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Copyright information

© Università degli Studi di Ferrara 2017

Authors and Affiliations

  • Hocine Gabsi
    • 1
  • Abdelouaheb Ardjouni
    • 1
    • 2
  • Ahcene Djoudi
    • 1
  1. 1.Applied Mathematics Lab, Department of Mathematics, Faculty of SciencesUniversity of AnnabaAnnabaAlgeria
  2. 2.Department of Mathematics and InformaticsUniversity of Souk AhrasSouk AhrasAlgeria

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