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Scalar Delay Differential Equations on Semiaxis with Positive and Negative Coefficients

In: Nonoscillation Theory of Functional Differential Equations with Applications

Author

Listed:
  • Ravi P. Agarwal

    (Texas A&M University—Kingsville, Department of Mathematics)

  • Leonid Berezansky

    (Ben-Gurion University of the Negev, Department of Mathematics)

  • Elena Braverman

    (University of Calgary, Department of Mathematics)

  • Alexander Domoshnitsky

    (Ariel University Center of Samaria, Department of Computer Sciences and Mathematics)

Abstract

In Chap. 3, nonoscillation of equations with several delays and coefficients of different signs is considered. Unlike equations with positive coefficients, the existence of a positive solution in this case does not imply positivity of the fundamental function, as the first example of the chapter demonstrates. Also, nonoscillatory solutions do not necessarily tend to zero. There have been many mistakes made when studying such equations, one of them made by the authors in their paper in the Journal of Mathematical Analysis and Applications published in 2002. A corrected result on the relation of nonoscillation and positivity of the fundamental function is included in this chapter. In addition, the chapter presents comparison results, explicit nonoscillation conditions, discussion on the asymptotic properties of nonoscillatory solutions and the analysis of the equation with one delay term and an oscillating coefficient. For such an equation, examples demonstrate that even if the positive part of the coefficient “prevails”, this still does not guarantee that nonoscillatory solutions tend to zero.

Suggested Citation

  • Ravi P. Agarwal & Leonid Berezansky & Elena Braverman & Alexander Domoshnitsky, 2012. "Scalar Delay Differential Equations on Semiaxis with Positive and Negative Coefficients," Springer Books, in: Nonoscillation Theory of Functional Differential Equations with Applications, edition 127, chapter 0, pages 59-81, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4614-3455-9_3
    DOI: 10.1007/978-1-4614-3455-9_3
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