A comment on some new definitions of fractional derivative
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Abstract
After reviewing the definition of two differential operators which have been recently introduced by Caputo and Fabrizio and, separately, by Atangana and Baleanu, we present an argument for which these two integro-differential operators can be understood as simple realizations of a much broader class of fractional operators, i.e. the theory of Prabhakar fractional integrals. Furthermore, we also provide a series expansion of the Prabhakar integral in terms of Riemann–Liouville integrals of variable order. Then, by using this last result we finally argue that the operator introduced by Caputo and Fabrizio cannot be regarded as fractional. Besides, we also observe that the one suggested by Atangana and Baleanu is indeed fractional, but it is ultimately related to the ordinary Riemann–Liouville and Caputo fractional operators. All these statements are then further supported by a precise analysis of differential equations involving the aforementioned operators. To further strengthen our narrative, we also show that these new operators do not add any new insight to the linear theory of viscoelasticity when employed in the constitutive equation of the Scott–Blair model.
Keywords
Prabhakar function Mittag–Leffler function Caputo–Fabrizio derivative Atangana–Baleanu derivativeNotes
Acknowledgements
The work of the authors has been carried out in the framework of the activities of the National Group of Mathematical Physics (GNFM, INdAM). Moreover, the work of A.G. has been partially supported by GNFM/INdAM Young Researchers Project 2017 “Analysis of Complex Biological Systems”.
Compliance with ethical standards
Conflict of interest
The author declares that he has no conflict of interest concerning the publication of this manuscript.
References
- 1.Caputo, M., Fabrizio, M.: A new definition of fractional derivative without singular kernel. Prog. Fract. Differ. Appl. 1(2), 73–85 (2015). https://doi.org/10.12785/pfda/010201 Google Scholar
- 2.Gorenflo, R., Kilbas, A.A., Mainardi, F., Rogosin, S.V.: Mittag–Leffler Functions, Related Topics and Applications. Springer, Berlin (2014)CrossRefzbMATHGoogle Scholar
- 3.Atangana, A., Baleanu, D.: New fractional derivatives with nonlocal and non-singular kernel: theory and application to heat transfer model. Therm. Sci. 20(2), 763–769 (2016). https://doi.org/10.2298/TSCI160111018A CrossRefGoogle Scholar
- 4.Gorenflo, R., Mainardi, F.: Fractional calculus: integral and differential equations of fractional order. In: Carpinteri, A., Mainardi, F. (eds.) Fractals and Fractional Calculus in Continuum Mechanics. Springer, New York (1997)Google Scholar
- 5.Mainardi, F.: Fractional calculus: some basic problems in continuum and statistical mechanics. In: Carpinteri, A., Mainardi, F. (eds.) Fractals and Fractional Calculus in Continuum Mechanics. Springer, New York (1997)Google Scholar
- 6.Mainardi, F.: Fractional Calculus and Waves in Linear Viscoelasticity. Imperial College Press, London (2010)CrossRefzbMATHGoogle Scholar
- 7.Samko, S.G., Kilbas, A.A., Marichev, O.I.: Fractional Integrals and Derivatives: Theory and Applications, vol. 44. Gordon and Breach, Yverdon (1993)zbMATHGoogle Scholar
- 8.Garra, R., Gorenflo, R., Polito, F., Tomovski, Z.: Hilfer–Prabhakar derivatives and some applications. Appl. Math. Comput. 242, 576–589 (2014). https://doi.org/10.1016/j.amc.2014.05.129 MathSciNetzbMATHGoogle Scholar
- 9.Garra, R., Garrappa, R.: The Prabhakar or three parameter Mittag–Leffler function: theory and application. Commun. Nonlinear Sci. Numer. Simul. 56, 314–329 (2018). https://doi.org/10.1016/j.cnsns.2017.08.018 MathSciNetCrossRefGoogle Scholar
- 10.Garrappa, R.: Grünwald–Letnikov operators for fractional relaxation in Havriliak–Negami models. Commun. Nonlinear Sci. Numer. Simul. 38, 178–191 (2016). https://doi.org/10.1016/j.cnsns.2016.02.015 MathSciNetCrossRefGoogle Scholar
- 11.Garrappa, R., Mainardi, F., Maione, G.: Models of dielectric relaxation based on completely monotone functions. Fract. Calc. Appl. Anal. 19, 1105–1160 (2016). https://doi.org/10.1515/fca-2016-0060 MathSciNetCrossRefzbMATHGoogle Scholar
- 12.Haubold, H.J., Mathai, A.M., Saxena, R.K.: Mittag–Leffler functions and their applications. J. Appl. Math. 2011, Article ID 298628 (2011). https://doi.org/10.1155/2011/298628
- 13.Kilbas, A., Saigo, M., Saxena, R.: Generalized Mittag–Leffler function and generalized fractional calculus operators. Integr. Transforms Spec. Funct. 15, 31–49 (2004). https://doi.org/10.1080/10652460310001600717 MathSciNetCrossRefzbMATHGoogle Scholar
- 14.Mainardi, F., Garrappa, R.: On complete monotonicity of the Prabhakar function and non-Debye relaxation in dielectrics. J. Comput. Phys. 293, 70–80 (2015). https://doi.org/10.1016/j.jcp.2014.08.006 MathSciNetCrossRefzbMATHGoogle Scholar
- 15.Polito, F., Tomovski, Z.: Some properties of Prabhakar-type fractional calculus operators. Fract. Differ. Calc. 6(1), 73–94 (2016). https://doi.org/10.7153/fdc-06-05 MathSciNetCrossRefGoogle Scholar
- 16.Srivastava, H.M., Tomovski, Z.: Fractional calculus with an integral operator containing a generalized Mittag–Leffler function in the kernel. Appl. Math. Comput. 211(1), 198–210 (2009). https://doi.org/10.1016/j.amc.2009.01.055 MathSciNetzbMATHGoogle Scholar
- 17.Giusti, A., Colombaro, I.: Prabhakar-like fractional viscoelasticity. Commun. Nonlinear Sci. Numer. Simul. 56, 138–143 (2018). https://doi.org/10.1016/j.cnsns.2017.08.002 MathSciNetCrossRefGoogle Scholar
- 18.Ortigueira, M.D., Tenreiro, Machado J.: What is a fractional derivative? J. Comput. Phys. 293, 4–13 (2015). https://doi.org/10.1016/j.jcp.2014.07.019 MathSciNetCrossRefzbMATHGoogle Scholar
- 19.Prabhakar, T.R.: A singular integral equation with a generalized Mittag–Leffler function in the kernel. Yokohama Math. J. 19, 7–15 (1971)MathSciNetzbMATHGoogle Scholar
- 20.Colombaro, I., Giusti, A., Vitali, S.: Storage and dissipation of energy in Prabhakar viscoelasticity. Mathematics 6(2), 15 (2018). https://doi.org/10.3390/math6020015 CrossRefGoogle Scholar
- 21.Mainardi, F., Spada, G.: Creep, relaxation and viscosity properties for basic fractional models in rheology. Eur. Phys. J. Spec. Topics 193, 133–160 (2011). https://doi.org/10.1140/epjst/e2011-01387-1 CrossRefGoogle Scholar
- 22.Giusti, A.: On infinite order differential operators in fractional viscoelasticity. Fract. Calc. Appl. Anal. 20(4), 854–867 (2017). https://doi.org/10.1515/fca-2017-0045 MathSciNetCrossRefzbMATHGoogle Scholar
- 23.Ortigueira, M.D., Tenreiro, Machado J.: A critical analysis of the Caputo–Fabrizio operator. Commun. Nonlinear Sci. Numer. Simul. 59, 608–611 (2018). https://doi.org/10.1016/j.cnsns.2017.12.001 MathSciNetCrossRefGoogle Scholar
- 24.Tarasov, V.E.: No nonlocality. No fractional derivative. Commun. Nonlinear Sci. Numer. Simul. 62, 157–163 (2018). https://doi.org/10.1016/j.cnsns.2018.02.019 MathSciNetCrossRefGoogle Scholar