A Simple Solution for the General Fractional Ambartsumian Equation

Manuel Duarte Ortigueira, Gabriel Bengochea

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
13 Downloads (Pure)


Fractionalisation and solution of the Ambartsumian equation is considered. The general approach to fractional calculus suitable for applications in physics and engineering is described. It is shown that Liouville-type derivatives are the necessary ones, because they fully preserve backward compatibility with classical results. Such derivatives are used to define and solve the fractional Ambartsumian equation. First, a solution in terms of a slowly convergent fractional Taylor series is obtained. Then, a simple solution expressed in terms of an infinite linear combination of Mittag–Leffler functions is deduced. A fast algorithm, based on a bilinear transformation and using the fast Fourier transform, is described and demonstrated for its approximate numerical realisation.

Original languageEnglish
Article number871
Number of pages15
JournalApplied Sciences
Issue number2
Publication statusPublished - 8 Jan 2023


  • Ambartsumian equation
  • bilinear transformation
  • fractional derivative
  • Grünwald–Letnikov
  • Mittag–Leffler function


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