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A Systematic Approach to Delay Functions

Author

Listed:
  • Christopher N. Angstmann

    (School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052, Australia)

  • Stuart-James M. Burney

    (School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052, Australia)

  • Bruce I. Henry

    (School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052, Australia)

  • Byron A. Jacobs

    (Department of Mathematics and Applied Mathematics, University of Johannesburg, Johannesburg 2092, South Africa)

  • Zhuang Xu

    (School of Mathematics and Statistics, University of New South Wales, Sydney, NSW 2052, Australia)

Abstract

We present a systematic introduction to a class of functions that provide fundamental solutions for autonomous linear integer-order and fractional-order delay differential equations. These functions, referred to as delay functions, are defined through power series or fractional power series, with delays incorporated into their series representations. Using this approach, we have defined delay exponential functions, delay trigonometric functions and delay fractional Mittag-Leffler functions, among others. We obtained Laplace transforms of the delay functions and demonstrated how they can be employed in finding solutions to delay differential equations. Our results, which extend and unify previous work, offer a consistent framework for defining and using delay functions.

Suggested Citation

  • Christopher N. Angstmann & Stuart-James M. Burney & Bruce I. Henry & Byron A. Jacobs & Zhuang Xu, 2023. "A Systematic Approach to Delay Functions," Mathematics, MDPI, vol. 11(21), pages 1-34, November.
    • Handle: RePEc:gam:jmathe:v:11:y:2023:i:21:p:4526-:d:1273318
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    References listed on IDEAS

    as
    1. Li, Mengmeng & Wang, JinRong, 2018. "Exploring delayed Mittag-Leffler type matrix functions to study finite time stability of fractional delay differential equations," Applied Mathematics and Computation, Elsevier, vol. 324(C), pages 254-265.
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