scholarly journals A Tutorial on the Basic Special Functions of Fractional Calculus

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Probability Theory ◽  
Integral Equation ◽  
Fractional Calculus ◽  
Diffusion Equation ◽  
Special Function ◽  
Special Functions ◽  
Fractional Diffusion ◽  
Basic Properties ◽  
Fractional Relaxation ◽  
Time Fractional Diffusion Equation

In this tutorial survey we recall the basic properties of the special function of the Mittag-Leffler and Wright type that are known to be relevant in processes dealt with the fractional calculus. We outline the major applications of these functions. For the Mittag-Leffler functions we analyze the Abel integral equation of the second kind and the fractional relaxation and oscillation phenomena. For the Wright functions we distinguish them in two kinds. We mainly stress the relevance of the Wright functions of the second kind in probability theory with particular regard to the so-called M-Wright functions that generalizes the Gaussian and is related with the time-fractional diffusion equation.

scholarly journals Existence and Uniqueness of the Solution for a Time-Fractional Diffusion Equation with Robin Boundary Condition

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Jukka Kemppainen
Keyword(s):  
Boundary Condition ◽  
Integral Equation ◽  
Diffusion Equation ◽  
Existence And Uniqueness ◽  
Original Problem ◽  
Robin Boundary Condition ◽  
Fractional Diffusion ◽  
Uniqueness Of The Solution ◽  
Time Fractional Diffusion Equation ◽  
Robin Boundary

Existence and uniqueness of the solution for a time-fractional diffusion equation with Robin boundary condition on a bounded domain with Lyapunov boundary is proved in the space of continuous functions up to boundary. Since a Green matrix of the problem is known, we may seek the solution as the linear combination of the single-layer potential, the volume potential, and the Poisson integral. Then the original problem may be reduced to a Volterra integral equation of the second kind associated with a compact operator. Classical analysis may be employed to show that the corresponding integral equation has a unique solution if the boundary data is continuous, the initial data is continuously differentiable, and the source term is Hölder continuous in the spatial variable. This in turn proves that the original problem has a unique solution.

Existence and uniqueness of the solution for a time-fractional diffusion equation

2011 ◽  
Vol 14 (3) ◽  
Author(s):  
J. Kemppainen
Keyword(s):  
Integral Equation ◽  
Diffusion Equation ◽  
Unique Solution ◽  
Double Layer ◽  
Existence And Uniqueness ◽  
Fractional Diffusion ◽  
Double Layer Potential ◽  
Layer Potential ◽  
Uniqueness Of The Solution ◽  
Time Fractional Diffusion Equation

AbstractIn the paper existence and uniqueness of the solution for a time-fractional diffusion equation on a bounded domain with Lyapunov boundary is proved in the space of continuous functions up to boundary. Since a fundamental solution of the problem is known, we may seek the solution as the double layer potential. This approach leads to a Volterra integral equation of the second kind associated with a compact operator. Then classical analysis may be employed to show that the corresponding integral equation has a unique solution if the boundary datum is continuous and satisfies a compatibility condition. This proves that the original problem has a unique solution and the solution is given by the double layer potential.

Discrete Fractional Diffusion Equation of Chaotic Order

2016 ◽  
Vol 26 (01) ◽  
pp. 1650013 ◽  
Author(s):  
Guo-Cheng Wu ◽  
Dumitru Baleanu ◽  
He-Ping Xie ◽  
Sheng-Da Zeng
Keyword(s):  
Porous Media ◽  
Fractional Calculus ◽  
Diffusion Equation ◽  
Discrete Time ◽  
Chaotic Map ◽  
Fractional Diffusion ◽  
Fractional Diffusion Equation ◽  
Variable Order ◽  
Diffusion Modeling ◽  
Discrete Fractional Calculus

Discrete fractional calculus is suggested in diffusion modeling in porous media. A variable-order fractional diffusion equation is proposed on discrete time scales. A function of the variable order is constructed by a chaotic map. The model shows some new random behaviors in comparison with other variable-order cases.

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