Abstract
This paper discusses the modeling via mathematical methods based on fractional calculus, using Caputo fractional derivative. From the fractional models associated with harmonic oscillator, logistic equation and Malthusian growth, an unexpected behavior of the Caputo fractional derivative is discussed. The difference between the rate of variation and the order of the Caputo fractional derivative is explained.
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Notes
In fact, the name Fractional Calculus is not accurate, since the order of an integral and a derivative can be real and also complex.
For convenience, is defined that \(I^0f(t)=f(t)\).
It follows from the definition that if \(\alpha =m\), so \(D^m f(t)=I^{m-m}\,D^m f(t)=I^0\,D^mf(t)=D^mf(t)\), that is, the usual derivative is a particular case.
Indeed, this argument is not accurate, and it will be explained in the last section.
Since for \(1<\alpha \le 2\), in Eq. (8), \(m=2\).
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The authors thanks the research group MApliC for the important and productive discussions.
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Communicated by Paulo Fernando de Arruda Mancera and Igor Freire.
RFC thanks CNPq—National Counsel of Technological and Scientific Development (455920/2014-1) and PFAM thanks FAPESP—São Paulo Research Foundation (2013/08133-0).
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Kuroda, L.K.B., Gomes, A.V., Tavoni, R. et al. Unexpected behavior of Caputo fractional derivative. Comp. Appl. Math. 36, 1173–1183 (2017). https://doi.org/10.1007/s40314-015-0301-9
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DOI: https://doi.org/10.1007/s40314-015-0301-9
Keywords
- Caputo fractional derivative
- Fractional modeling
- Fractional calculus
- Fractional harmonic oscillator
- Fractional logistic equation