Discrete-Time Fractional Variational Problems

Details Discrete-Time Fractional Variational Problems Discrete-Time Fractional Variational Problems

2010-05-03

arxiv.org/abs/1005.0252v1

Signal Process. 91 (2011), no. 3, 513--524

Mathematics

Optimization and Control

Submitted 24/Nov/2009; Revised 16/Mar/2010; Accepted 3/May/2010; for publication in Signal Processing.

Scientific paper

10.1016/j.sigpro.2010.05.001

We introduce a discrete-time fractional calculus of variations on the time scale $h\mathbb{Z}$, $h > 0$. First and second order necessary optimality conditions are established. Examples illustrating the use of the new Euler-Lagrange and Legendre type conditions are given. They show that solutions to the considered fractional problems become the classical discrete-time solutions when the fractional order of the discrete-derivatives are integer values, and that they converge to the fractional continuous-time solutions when $h$ tends to zero. Our Legendre type condition is useful to eliminate false candidates identified via the Euler-Lagrange fractional equation.

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