An approximation method for high-order fractional derivatives of algebraically singular functions

  • Authors:
  • Takemitsu Hasegawa;Hiroshi Sugiura

  • Affiliations:
  • Department of Information Science, University of Fukui, Fukui, 910-8507, Japan;Department of Systems Design and Engineering, Nanzan University, Seto, Aichi, 489-0863, Japan

  • Venue:
  • Computers & Mathematics with Applications
  • Year:
  • 2011

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Abstract

The fractional derivative D^qf(s) (0@?s@?1) of a given function f(s) with a positive non-integer q is defined in terms of an indefinite integral. We propose a uniform approximation scheme to D^qf(s) for algebraically singular functions f(s)=s^@ag(s) (@a-1) with smooth functions g(s). The present method consists of interpolating g(s) at sample points t"j in [0,1] by a finite sum of the Chebyshev polynomials. We demonstrate that for the non-negative integer m such that m=q-m-1. Some numerical examples in the simplest case 1