The Laplace Transform Method for Linear Differential Equations of the Fractional Order

TL;DR

This paper introduces a Laplace transform method for solving linear fractional differential equations using Mittag-Leffler functions, extending to sequential derivatives and providing explicit Green's functions for various cases.

Contribution

It develops a Laplace transform approach for fractional differential equations, including sequential derivatives, and derives explicit Green's functions for multiple cases.

Findings

Explicit solutions for fractional differential equations using the Laplace transform.

Derived Green's functions for one- to four-term fractional equations.

Applied method to fractional diffusion-wave equations.

Abstract

The Laplace transform method for solving of a wide class of initial value problems for fractional differential equations is introduced. The method is based on the Laplace transform of the Mittag-Leffler function in two parameters. To extend the proposed method for the case of so-called "sequential" fractional differential equations, the Laplace transform for the ''sequential'' fractional derivative is also obtained. Besides that, tools necessary for testing candidate solutions by direct substitution in corresponding equations are introduced: fractional derivatives of the Mittag-Leffler function and the rule for the fractional differentiation of integrals depending on a parameter. Definition of the fractional Green's function is given and some of its properties, necessary for constructing solutions of initial-value problems for fractional linear differential equations, are presented. Explicit expressions for the fractional Green's function for the special cases of one-, two-, three- and four-term equations are given, as well as the explicit expression for an arbitrary n-term fractional linear ordinary differential equation with constant coefficients. Several examples of solution of various types of fractional differential equations, including fractional diffusion-wave equation. The bibliography (54 items) covers many field of possible application of fractional derivatives.