# Fractional complex transforms for fractional differential equations

## Abstract

The fractional complex transform is employed to convert fractional differential equations analytically in the sense of the Srivastava-Owa fractional operator and its generalization in the unit disk. Examples are illustrated to elucidate the solution procedure including the space-time fractional differential equation in complex domain, singular problems and Cauchy problems. Here, we consider analytic solutions in the complex domain.

MSC:30C45.

## 1 Introduction

The theory of fractional calculus has been applied in the theory of analytic functions. The classical concepts of a fractional differential operator and a fractional integral operator and their generalizations have fruitfully been employed in finding, for example, the characterization properties, coefficients estimate , distortion inequalities  and convolution properties for difference subclasses of analytic functions.

Fractional differential equations are viewed as alternative models to nonlinear differential equations. Varieties of them play important roles and serve as tools not only in mathematics, but also in physics, dynamical systems, control systems, and engineering to create the mathematical modeling of many physical phenomena. Furthermore, they are employed in social sciences such as food supplement, climate, and economics. Fractional differential equations concerning the Riemann-Liouville fractional operators or the Caputo derivative have been recommended by many authors (see ).

Recently, the complex modelings of phenomena in nature and society have been the object of several investigations based on the methods originally developed in a physical context. These systems are the consequence of the ability of individuals to develop strategies. They occur in kinetic theory , complex dynamical systems , chaotic complex systems and hyperchaotic complex systems , and the complex Lorenz-like system which has been found in laser physics while analyzing baroclinic instability of the geophysical flows in the atmosphere (or in the ocean) [14, 15]. Sainty  considered the complex heat equation using a complex valued Brownian. A model of complex fractional equations is introduced by Jumarie  using different types of fractional derivatives. Baleanu et al.  imposed several applications of fractional calculus including complex modelings. The author studied various types of fractional differential equations in complex domain such as the Cauchy equation, the diffusion equation and telegraph equations .

Transform is a significant technique to solve mathematical problems. Many useful transforms for solving various problems appeared in open literature such as wave transformation, the Laplace transform, the Fourier transform, the Bücklund transformation, the integral transform, the local fractional integral transforms and the fractional complex transform (see [29, 30]).

In this paper, we shall introduce two generalizations of the wave transformation in the complex domain. These generalizations depend on the fractional differential operators for complex variables. These transformations convert the fractional differential equations in complex domain into ordinary differential equations to obtain analytic solutions or exact solutions. Examples are illustrated.

In , Srivastava and Owa provided the definitions for fractional operators (derivative and integral) in the complex z-plane as follows.

Definition 1.1 The fractional derivative of order α is defined, for a function $f(z)$, by

$D z α f(z):= 1 Γ ( 1 − α ) d d z ∫ 0 z f ( ζ ) ( z − ζ ) α dζ;0≤α<1,$

where the function $f(z)$ is analytic in a simply-connected region of the complex z-plane containing the origin, and the multiplicity of $( z − ζ ) − α$ is removed by requiring $log(z−ζ)$ to be real when $(z−ζ)>0$.

Definition 1.2 The fractional integral of order α is defined, for a function $f(z)$, by

$I z α f(z):= 1 Γ ( α ) ∫ 0 z f(ζ) ( z − ζ ) α − 1 dζ;α>0,$

where the function $f(z)$ is analytic in a simply-connected region of the complex z-plane $(C)$ containing the origin, and the multiplicity of $( z − ζ ) α − 1$ is removed by requiring $log(z−ζ)$ to be real when $(z−ζ)>0$.

Remark 1.1 From Definitions 1.1 and 1.2, we have

$D z α z β = Γ ( β + 1 ) Γ ( β − α + 1 ) z β − α ,β>−1;0≤α<1$

and

$I z α z β = Γ ( β + 1 ) Γ ( β + α + 1 ) z β + α ,β>−1;α>0.$

In  the author derived a formula for the generalized fractional integral. Consider for natural $n∈N={1,2,…}$ and real μ, the n-fold integral of the form

$I z α , μ f(z)= ∫ 0 z ζ 1 μ d ζ 1 ∫ 0 ζ 1 ζ 2 μ d ζ 2 ⋯ ∫ 0 ζ n − 1 ζ n μ f( ζ n )d ζ n ,$
(1)

which yields Repeating the above step $n−1$ times, we obtain

$∫ 0 z ζ 1 μ d ζ 1 ∫ 0 ζ 1 ζ 2 μ d ζ 2 ⋯ ∫ 0 ζ n − 1 ζ n μ f( ζ n )d ζ n = ( μ + 1 ) 1 − n ( n − 1 ) ! ∫ 0 z ( z μ + 1 − ζ μ + 1 ) n − 1 ζ μ f(ζ)dζ,$

which implies the fractional operator type

$I z α , μ f(z)= ( μ + 1 ) 1 − α Γ ( α ) ∫ 0 z ( z μ + 1 − ζ μ + 1 ) α − 1 ζ μ f(ζ)dζ,$
(2)

where a and $μ≠−1$ are real numbers and the function $f(z)$ is analytic in a simply-connected region of the complex z-plane containing the origin, and the multiplicity of $( z μ + 1 − ζ μ + 1 ) − α$ is removed by requiring $log( z μ + 1 − ζ μ + 1 )$ to be real when $( z μ + 1 − ζ μ + 1 )>0$. When $μ=0$, we get the standard Srivastava-Owa fractional integral, which is applied to define the Srivastava-Owa fractional derivatives. The computation implies 

$I z α , μ z ν = z α ( μ + 1 ) + ν ( μ + 1 ) α Γ ( ν + μ + 1 μ + 1 ) Γ ( α + ν + μ + 1 μ + 1 ) .$
(3)

When $μ=0$, we obtain $I z α z ν = Γ ( ν + 1 ) Γ ( α + ν + 1 ) z α + ν$ (see Remark 1.1).

Corresponding to the generalized fractional integrals (2), we imposed the generalized differential operator.

Definition 1.3 The generalized fractional derivative of order α is defined, for a function $f(z)$, by

$D z α , μ f(z):= ( μ + 1 ) α Γ ( 1 − α ) d d z ∫ 0 z ζ μ f ( ζ ) ( z μ + 1 − ζ μ + 1 ) α dζ;0≤α<1,$
(4)

where the function $f(z)$ is analytic in a simply-connected region of the complex z-plane containing the origin, and the multiplicity of $( z μ + 1 − ζ μ + 1 ) − α$ is removed by requiring $log( z μ + 1 − ζ μ + 1 )$ to be real when $( z μ + 1 − ζ μ + 1 )>0$. The calculation yields

$D z α , μ z ν = ( μ + 1 ) α − 1 Γ ( ν μ + 1 + 1 ) Γ ( ν μ + 1 + 1 − α ) z ( 1 − α ) ( μ + 1 ) + ν − 1 .$
(5)

When $μ=0$, we obtain $D z α z ν = Γ ( ν + 1 ) Γ ( ν + 1 − α ) z ν − α$ (see Remark 1.1).

For analytic functions of the form

$f(z)= ∑ n = 1 ∞ a n z n ,z∈U,$
(6)

we have the following property:

$D z α , μ I z α , μ f(z)= I z α , μ D z α , μ f(z)=f(z),z∈U.$

## 2 Fractional complex transform

In recent times, one of the most important and useful methods for fractional calculus called fractional complex transform has appeared . Fractional complex transform is to renovate the fractional differential equations into ordinary differential equations, yielding a tremendously simple solution procedure. In this section, we illustrate some fractional complex transform using properties of the Srivastava-Owa fractional operator and its generalization. Analogous to wave transformation

$η=az+bw+cu+⋯,$
(7)

where a, b, and c are constants, the fractional complex transform is

$η=a z α +b w β +c u γ +⋯$
(8)

for the fractional differential equations in the sense of the Srivastava-Owa fractional operators. While the fractional complex transform of the form

$η=A z α ( μ + 1 ) +B w β ( μ + 1 ) +C u γ ( μ + 1 ) +⋯$
(9)

is applied to fractional differential equations in the sense of the generalized operators (2) and (4). It is obvious that when $μ=0$, (9) reduces to (8). Furthermore, in a real case, (9) implies the fractional complex transform defined in . We impose the fractional complex transform

$D z α f(z)= ∂ f ∂ Z D z α Z,Z:= z α$
(10)

if we denote $D z α f(z):= ∂ α f ∂ z α$, it yields

$∂ α f ∂ z α = ∂ f ∂ Z ∂ α Z ∂ z α : = ∂ f ∂ Z θ α ,$
(11)

where $θ α$ is the fractal index, which is usually determined in terms of gamma functions. Similarly, we can receive

$D z α , μ f(z)= ∂ f ∂ Z D z α , μ Z,Z:= z α ( μ + 1 )$
(12)

if we let $D z α , μ f(z):= ∂ α ( μ + 1 ) f ∂ z α ( μ + 1 )$, which implies

$∂ α ( μ + 1 ) f ∂ z α ( μ + 1 ) = ∂ f ∂ Z ∂ α ( μ + 1 ) Z ∂ z α ( μ + 1 ) : = ∂ f ∂ Z Θ α , μ .$
(13)

Example 2.1 Let $Z= z α$ and $f= Z n$, $n≠0$ then in view of Remark 1.1, we obtain

$∂ α f ∂ z α = ∂ f ∂ Z ∂ α Z ∂ z α = Γ ( 1 + n α ) z n α − α Γ ( 1 + n α − α ) : = ∂ f ∂ Z θ α = n θ α z n α − α .$

$θ α = Γ ( 1 + n α ) n Γ ( 1 + n α − α ) .$

Example 2.2 Let $Z= z α ( μ + 1 )$ and $f= Z n μ + 1$, $n≠0$ then in virtue of (5), we have

$∂ α ( μ + 1 ) f ∂ z α ( μ + 1 ) = ∂ f ∂ Z ∂ α ( μ + 1 ) Z n ∂ z α ( μ + 1 ) = ( μ + 1 ) α − 1 Γ ( n α μ + 1 + 1 ) Γ ( n α μ + 1 + 1 − α ) z ( 1 − α ) ( μ + 1 ) + n α − 1 : = ∂ f ∂ Z Θ α , μ = n Θ α , μ μ + 1 z ( 1 − α ) ( μ + 1 ) + n α − 1 .$

We, therefore, have

$Θ α , μ = ( μ + 1 ) α Γ ( n α μ + 1 + 1 ) n Γ ( n α μ + 1 + 1 − α ) .$

## 3 Applications

Example 3.1 Consider the following equation:

(14)

where $u(t,z)$ is the unknown function $ρ∈(0,1)$ and $β∈(0,1]$.

We propose to show that (14) has a unique analytic solution by using the Banach fixed point theorem. By assuming

$u(t,z)=μ(z)t+v(t,z) ( v ( t , z ) = O ( t 2 ) )$

as a formal solution, where $μ(z)=O( z β )$, calculations imply

$t 1 / 2 ∂ 1 / 2 u ( t , z ) ∂ t 1 / 2 =1.128μ(z)t+ t 1 / 2 v α (t,z),α=1/2,$

and

$D z β u(t,z)= D z β ( μ ( z ) t + v ( t , z ) ) =t D z β μ(z)+ v β (t,z).$

Therefore, $μ(z)$ satisfies

$ρμ(z)+ D z β μ(z)=0,$

which is equivalent to

$D z β μ(z)=g ( z , μ ( z ) ) ,$
(15)

where

$g ( z , μ ( z ) ) =−ρμ(z).$

Now $g(z,μ(z))$ is a contraction mapping whenever $ρ∈(0,1)$; therefore, in view of the Banach fixed point theorem, Eq. (15) has a unique analytic solution in the unit disk and consequently the problem (14).

To calculate the fractal index for the equation

$D z β μ(z)+ρμ(z)=0,μ(0)=1,$
(16)

we assume the transform $Z= z β$ and the solution can be expressed in a series in the form

$μ(Z)= ∑ m = 0 ∞ μ m Z m ,$
(17)

where $μ m$ are constants. Substituting (17) into Eq. (16) yields

$∂ ∂ Z ∑ m = 0 ∞ θ β m μ m Z m +ρ ∑ m = 0 ∞ μ m Z m =0.$
(18)

Since

$θ β m = Γ ( 1 + m β ) m Γ ( 1 + m β − β ) ,$

then the computation imposes the relation

$Γ ( 1 + m β ) Γ ( 1 + m β − β ) μ m +ρ μ m − 1 =0$

with $μ(0)=1$, and consequently we obtain

$μ m = ( − ρ ) m Γ ( 1 + m β ) .$

Thus, we have the following solution:

$μ(Z)= ∑ m = 0 ∞ ( − ρ ) m Γ ( 1 + m β ) Z m$

which is equivalent to

$μ(z)= ∑ m = 0 ∞ ( − ρ ) m Γ ( 1 + m β ) z m β = E β ( − ρ z β ) ,$

where $E β$ is a Mittag-Leffler function. The last assertion is the exact solution for the problem (16) and consequently for (14).

Example 3.2 Consider the following equation:

(19)

where $u(t,z)$ is the unknown function and $β∈(0,1]$. In the same manner of Example 3.1, we let

$u(t,z)=μ(z)t+v(t,z) ( v ( t , z ) = O ( t 2 ) )$

as a formal solution, where $μ(z)=O( z β )$ and

$| μ ′ ( z ) − ν ′ ( z ) | <λ | μ ( z ) − ν ( z ) | ,λ< 1 8 .$

Estimations imply and

$D z β u(t,z)= D z β ( μ ( z ) t + v ( t , z ) ) =t D z β μ(z)+ v β (t,z).$

Therefore, $μ(z)$ satisfies

$μ ( z ) 2 +4z μ ′ (z)+ D z β μ(z)− z β =0,$

which is equivalent to

$D z β μ(z)=G ( z , μ ( z ) , z μ ′ ( z ) ) ,$
(20)

where

$G ( z , μ ( z ) , z μ ′ ( z ) ) = z β −1/2μ(z)−4z μ ′ (z).$

Now, to show that $G(z,μ(z),z μ ′ (z))$ is a contraction mapping, Thus, in view of the Banach fixed point theorem, Eq. (20) has a unique analytic solution in the unit disk and consequently the problem (19).

To evaluate the fractal index for the equation

$D z β μ(z)+ μ ( z ) 2 +4z μ ′ (z)− z β =0,μ(0)=1,$
(21)

we assume the transform $Z= z β$ and the solution can be articulated as in (17). Substituting (17) into Eq. (21), we have

$∂ ∂ Z ∑ m = 0 ∞ θ β m μ m Z m + 1 2 ∑ m = 0 ∞ μ m Z m +4 ∑ m = 1 ∞ m μ m Z m −Z=0,$
(22)

where

$θ β m = Γ ( 1 + m β ) m Γ ( 1 + m β − β ) .$

Hence, the computation imposes the relation

$( Γ ( 1 + m β ) Γ ( 1 + m β − β ) + 4 m ) μ m + 1 2 μ m − 1 =0$

with $μ(0)=1$, and consequently we obtain

$μ m := ( B m ) m Γ ( 1 + m β ) ,$

where $B m$ in terms of a gamma function. If we let $B:= max m { B m }$, then the solution approximates to

$μ(Z)≃ ∑ m = 0 ∞ ( B ) m Γ ( 1 + m β ) Z m ,$

which is equivalent to

$μ(z)= ∑ m = 0 ∞ ( B ) m Γ ( 1 + m β ) z m β = E β ( B z β ) .$

The last assertion is the exact solution for the problem (21) and consequently for (19).

Next, we consider the Cauchy problem by employing the generalized fractional differential operator (4). We shall show that the solution of such a problem can be determined in terms of the Fox-Wright function : where $A j >0$ for all $j=1,…,p$, $B j >0$ for all $j=1,…,q$, and $1+ ∑ j = 1 q B j − ∑ j = 1 p A j ≥0$ for suitable values $|w|<1$ and $a i$, $b j$ are complex parameters.

Example 3.3 Consider the Cauchy problem in terms of the differential operator (4)

$D z α , μ u(z)=F ( z , u ( z ) ) ,$
(23)

where $F(z,u(z))$ is analytic in u and $u(z)$ is analytic in the unit disk. Thus, F can be expressed by

$F(z,u)=ϕu(z).$

Let $Z= z α ( μ + 1 )$. Then the solution can be formulated as follows:

$u(Z)= ∑ m = 0 ∞ u m Z m ,$
(24)

where $u m$ are constants. Substituting (24) into Eq. (23) implies

$∂ ∂ Z ∑ m = 0 ∞ Θ α , μ , m u m Z m −ϕ ∑ m = 0 ∞ u m Z m =0.$
(25)

Since

$Θ α , μ , m = ( μ + 1 ) α Γ ( m α μ + 1 + 1 ) m Γ ( n α μ + 1 + 1 − α ) ,$

then the calculation yields the relation

$( μ + 1 ) α Γ ( m α μ + 1 + 1 ) Γ ( m α μ + 1 + 1 − α ) u m −ϕ u m − 1 =0;$

consequently, we obtain

$u m = [ ϕ ( μ + 1 ) α ] m Γ ( ( m − 1 ) α μ + 1 + 1 − α ) Γ ( m α μ + 1 + 1 − α ) Γ ( ( m − 1 ) α μ + 1 + 1 ) Γ ( m α μ + 1 + 1 ) .$

Thus, we have the following solution:

$u(Z)= ∑ m = 0 ∞ [ ϕ ( μ + 1 ) α ] m Γ ( ( m − 1 ) α μ + 1 + 1 − α ) Γ ( m α μ + 1 + 1 − α ) Γ ( ( m − 1 ) α μ + 1 + 1 ) Γ ( m α μ + 1 + 1 ) Z m$

which is equivalent to

$u(Z)= ∑ m = 0 ∞ [ ϕ ( μ + 1 ) α ] m Γ ( m + 1 ) Γ ( ( m − 1 ) α μ + 1 + 1 − α ) Γ ( m α μ + 1 + 1 − α ) Γ ( ( m − 1 ) α μ + 1 + 1 ) Γ ( m α μ + 1 + 1 ) Z m m ! .$

Since ϕ is an arbitrary constant, we assume that

$ϕ:= ( μ + 1 ) α .$

Thus, for a suitable α, we present or where $|z|<1$.

## 4 Conclusion

A generalized fractional complex transform is suggested in this paper to find exact solutions of fractional differential equations in the unit disk. We have converted some classes of fractional differential equations in the sense of the Srivastava-Owa fractional operator and its generalization into ordinary differential equations. Hence, the exact solutions are imposed. The solution procedure is simple and might find wide applications in image processing and signal processing by using fractional filter mask. Examples 3.1 and 3.2 showed the conversion of time-space fractional differential equations into a normal case. The exact solutions are introduced in the expression of a Mittag-Leffler function. While Example 3.3, the Cauchy problem of fractional order in the unit disk, proposed the exact solution in terms of the Fox-Wright function.

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Correspondence to Rabha W Ibrahim.

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Ibrahim, R.W. Fractional complex transforms for fractional differential equations. Adv Differ Equ 2012, 192 (2012). https://doi.org/10.1186/1687-1847-2012-192

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### Keywords

• fractional calculus
• fractional differential equations
• Srivastava-Owa fractional operators
• unit disk
• analytic function
• fractional complex transform
• Cauchy differential equation
• Fox-Wright function 