Applicable Analysis and Discrete Mathematics 2013 Volume 7, Issue 2, Pages: 343-353
https://doi.org/10.2298/AADM130828020A
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Exponential functions of discrete fractional calculus
Acar Nihan (Western Kentucky University, Department of Mathematics, Bowling Green, Kentucky, USA)
Atici Ferhan M. (Western Kentucky University, Department of Mathematics, Bowling Green, Kentucky, USA)
In this paper, exponential functions of discrete fractional calculus with the
nabla operator are studied. We begin with proving some properties of
exponential functions along with some relations to the discrete
Mittag-Leffler functions. We then study sequential linear difference
equations of fractional order with constant coefficients. A corresponding
characteristic equation is defined and considered in two cases where
characteristic real roots are same or distinct. We define a generalized
Casoratian for a set of discrete functions. As a consequence, for solutions
of sequential linear difference equations, their nonzero Casoratian ensures
their linear independence.
Keywords: discrete fractional calculus, discrete Mittag-Leffler functions, sequential fractional difference equations