Mathematics – Dynamical Systems
Scientific paper
2011-08-13
Nonlinear Analysis: Real World Applications, Volume 13, Issue 3, June 2012, Pages 1489-1497
Mathematics
Dynamical Systems
15 pages, 2 figure, submitted for publication: April 27th 2011; accepted: November 24, 2011
Scientific paper
10.1016/j.nonrwa.2011.11.013
Using the Mellin transform approach, it is shown that, in contrast with integer-order derivatives, the fractional-order derivative of a periodic function cannot be a function with the same period. The three most widely used definitions of fractional-order derivatives are taken into account, namely, the Caputo, Riemann-Liouville and Grunwald-Letnikov definitions. As a consequence, the non-existence of exact periodic solutions in a wide class of fractional-order dynamical systems is obtained. As an application, it is emphasized that the limit cycle observed in numerical simulations of a simple fractional-order neural network cannot be an exact periodic solution of the system.
Kaslik Eva
Sivasundaram Seenith
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