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New numerical method based on Generalized Bessel function to solve nonlinear Abel fractional differential equation of the first kind

  • K. Parand EMAIL logo and M. Nikarya
Published/Copyright: November 2, 2018
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Abstract

Fractional calculus and fractional differential equations (FDE) have many applications in different branches of sciences. But, often a real nonlinear FDE has not the exact or analytical solution and must be solved numerically. Therefore, we aim to introduce a new numerical algorithm based on generalized Bessel function of the first kind (GBF), spectral methods and Newton–Krylov subspace method to solve nonlinear FDEs. In this paper, we use the GBFs as the basis functions. Then, we introduce explicit formulas to calculate Riemann–Liouville fractional integral and derivative of GBFs that are very helpful in computation and saving time. In the presented method, a nonlinear FDE will be converted to a nonlinear system of algebraic equations using collocation method based on GBF, then the solution of this nonlinear algebraic system will be achieved by using Newton-generalized minimum residual (Newton–Krylov) method. To illustrate the reliability and efficiency of the proposed method, we apply it to solve some examples of nonlinear Abel FDE.

1 Introduction

Although fractional calculus is an ancient mathematical topic, however in the last few decades fractional calculus and fractional differential equations (FDEs) have found many applications in physics, chemistry, engineering, finance, and other branches of sciences, therefore scientists are attracted to study FDEs more than ever; for instance, see [15]. Most results about solving nonlinear FDEs are obtained by using numerical methods, because only some particular FDEs can be solved analytically. Due to the growing applications, considerable attention has been given to the numerical solution of fractional differential equations (FDE) [610]. Previously, many of researchers study FDEs and attempt to solve them by utilizing several numerical techniques, for example, Alipour and Agahi by using new computational techniques based on g-fractional differential operator [11], Wang and Fan by using the Chebyshev wavelet method[8], Rehman and Khan by using the Legendre wavelet method[9], Ordokhani and Rahimkhani by using Müntz–Legendre polynomials method[12], Xu et al. using an efficient quasi-Newton’s method and simplified reproducing kernel method[13], Doha and Bhrawy by using the Tau method Chebyshev [14], Pezza and Pitolli by using a multi-scale collocation method [15], Esmaeili and Shamsi by using the pseudo-spectral method [16], Pedas and Tamme by using the spline collocation methods [17], as well as many other researchers by several methods have attemptet to solve linear or nonlinear FDEs [1823, 2326].

In this paper, we attempt to introduce a new method, based on a new class of Bessel functions namely GBFs and spectral collocation method for solving nonlinear Abel FDE of the first kind. Formerly, classical Bessel functions and Bessel polynomials have been used for solving several types of nonlinear problems [2731]. Also previously, the classical Bessel function of the first kind has been used to solved nonlinear FDEs and fractional intrgro–differential equation, in their work the calculation of the fractional derivative of basis functions was not easy, for this reason they had to use few bases in spectral expansion [32].

Now, we aim to improve this problem, so we introduce the generalized Bessel function of the first kind (GBF), then by Riemann–Liouville fractional integral and derivative definition introduce explicit formulas to calculate fractional integro and derivative of GBF. Also, we introduce the derivative matrix of the Bessel function and GBF. Another novelty in this paper is using Newton–Krylov sub–space method to solve nonlinear system of algebraic equations that be obtained by spectral GBF method.

To show the reliability, efficiently and applicability of the proposed method we employ the presented method to solve nonlinear Abel FDE of the first kind [32, 33]:

Dαy(x)=a(x)y(x)3+b(x)y(x)2+c(x)y(x)+d(x),0<α<1,y(0)=0,(1)

where a(x), b(x), c(x) and d(x) are functions of x, and a(x) ≠ 0. D is the fractional derivative operator. The Abel differential equation has a long history and therefore it can be easily found in many areas of pure mathematics and applied mathematics [33, 34]. Among the existing methods, the most efficient is an analytical method, thus, many scholars have applied various analytical methods to find a reliable solution for different mathematical problems [33, 35]. On the other hand, for many decades, nonlinear differential equations such as Able equation were and are in the center of attentions to find an applicable and reliable analytical solution for them. Abel equation appears to reduce the order of many higher orders nonlinear problems. Hence, every day, the exact solution is demanded for Abel differential equation in first and second kind[36, 37].

The remainder of this paper is organized as follows. In Section 1.1, some essential definitions and information about the fractional calculus theory and FDEs are described. The basic information of function approximation, Bessel function and generalized Bessel function, spectral collocation methods based on generalized Bessel functions and Newton–Krylov method are explained in Section 2. In section 3, some examples of fractional Abel equation are solved by the proposed method and their results are presented. Finally, in the last section, we have described several concluding remarks.

1.1 Basic definitions of fractional calculus

In this section, we present some notations, definitions and preliminary facts of the fractional calculus theory.

Definition 1.

The Riemann–Liouville fractional integral operator I of order on a usual Lebesgue space is given by

Iαf(t)=1Γ(α)0t(tτ)α1f(τ)dτ.(2)

Some properties of this definition are:

I0f(t)=f(t)IαIβf(t)=Iα+βf(t)IαIβf(t)=IβIαf(t)Iα(t)ν=Γ(ν+1)Γ(α+ν+1)(t)α+ν

where fL1[a, b], β, α ≥ 0 and ν > −1

Definition 2.

The Riemann–Liouville fractional derivative of order α > 0 is defined as follows:

Dαf(t)=dmdtm(Imαf(t))=1Γ(mα)dmdtm0t(tτ)mα1f(τ)dτ(3)

where m is an integer, which is satisfied in m − 1 < αm. Another fractional differential operator D proposed by Caputo.

2 Spectral methods based on generalized Bessel functions

Definition 3:

Let λ = {x|a < x < b}, then nonnegative function ω(x) is a weight function if:

  1. (a) ω(x) ≥ 0 is measurable on finite or infinite interval.

  2. (b) µk = ∫Λxkω(x)dx < ∞ for k = 0, 1, ....

  3. (c) ∫Λω(x)dx > 0.

Let ω is a certain weight function, therefore:

Lω2(Λ)={v|v ismeasurableand vω<},

where

vω=(v,v)ω1/2=(Λ|v(x)|2ω(x)dx)1/2.

In particular, in Hilbert space Lω2(Λ), (u,v)ω = ∫Λu(x)v(x)ω(x)dx is inner product. If ω = 1 can be omitted, and let xkv=dkvdxk. Now for nonnegative integer m, we set

Hωm(Λ)={v|xkvLω2(Λ),0km},

with following norm, and semi-norm

(u,v)m,ω=k=0m(xku,xkv)ω,|v|m,ω=xmvω,vm,ω=(v,v)m,ω1/2.

For any real r ≥ 0, we define the space Hωr(Λ) by the space interpolation as in Adams [38].

2.1 Generalized Bessel function

In this section, we explain Bessel function and generalized Bessel function of the first kind and some useful relations of them.The Bessel function of the first kind Jn(x) is defined as follow:

Jn(x)=r=0(1)rr!Γ(n+r+1)(x2)2r+n,(4)

where Γ(λ) is the gamma function:

Γ(λ)=0ettλ1dt.

The series (4) is convergent for all −∞ < x < ∞. Actually, the Bessel function is a solution of the following Sturm– Liouville equation[39]:

x2y(x)+xy(x)+(x2n2)y(x)=0,forx(,),(n).(5)

It is clear that, for integer n, Jn(x) are linear independent. Some recursive relations of Bessel functions are as follows [39]:

ddx(xnJn(x))=xnJn1(x),Jn(x)=Jn1(x)nxJn(x),Jn(x)=nxJn(x)Jn+1(x).

Lemma:

One of the useful recursion relations of Bessel function of the first kind is:

Jn(x)=12Jn1(x)12Jn+1(x).(6)

Proof.

By deriving of (4) and using expansions of Jn−1(x) and Jn+1(x), the result is desirable. □

Remark:

The derivative operational matrix of the first kind Bessel functions can be obtained as follows:

Let Jn = [J0(x), J1(x), J2(x), ..., Jn(x)]T therefor J′ = D Jn, where D is derivative operational matrix and is obtained by (6):

D=[010000120120000120120000120120a0a2a30an](7)

where the a0, a1, a2, ..., an will be obtained by an interpolation technique.

Now we define generalized Bessel function (GBF) of the first kind as follows:

Definition 4:

Let n > −1 then generalized Bessel function (GBF) of the first kind is defined as:

J^n(x)=xn2Jn(x).(8)

Theorem 1:

A recursive relation of derivative of GBF of the first kind is as follows,

ddxJ^n(x)=12J^n1(x)(9)

Proof.

By using GBF of the first kind definition and expansion of Jn−1(x) the result will be achieved. □

Remark:

The derivative operational matrix of the first kind GBF can be obtained as follow:

Let J^n=[J^0(x),J^1(x),J^2(x),...,J^n(x)]T therefor J^n=D^J^n, where D^ is derivative operational matrix and is obtained using (9):

D=[b0b1b2bn1bn120000001200000012000000120](10)

where the b0, b1, b2, ..., bn will be obtained by an interpolation technique. Notice that:

J^1(x)=J^1(x)x

Theorem 2:

If α > 0 and n > −1 then the Riemann– Liouville fractional integral of generalized Bessel function of the first kind is:

IαJ^n(x)=2αJ^n+α(x),(11)

and the Riemann–Liouville fractional derivative of GBF is:

DαJ^n(x)=2αJ^nα(x).(12)

Proof.

By using definition of Bessel function of the first kind (4) and Riemann–Liouville fractional integral of J^n(x), we can write:

IαJ^n(x)=Iα[xn2Jn(x)]=Iα[xn2r=0(1)rr!Γ(n+r+1)(x2)2r+n]=Iα[r=0(1)rr!Γ(n+r+1)xr+n22r+n]=1Γ(α)0x(xt)α1r=0(1)rr!Γ(n+r+1)tr+n22r+ndt

by calculating and relations of Gamma function for real values, we have:

IαJ^n(x)=r=0(1)rr!Γ(n+r+α+1)xr+n+α22r+n.(13)

Which ultimately results

IαJ^n(x)=2αr=0(1)rr!Γ(n+r+α+1)xr+n+α22r+n+α=2αJ^n+α(x).(14)

Also, the Equation (12) can be concluded immediately in the same way. □

To comfort we denominate:

J^nα(x)=2αJ^nα(x)=DαJ^n(x),(15)

and J^nα=[J^0α(x),J^1α(x),...,J^nα(x)]T.

In this paper, we use the GBFs as the basis functions of L2(Λ). Let N be a positive integer, we define the following space:

JN=span{J^0,J^1,...,J^N},

this is clear that JN(Λ)Hr(Λ)L2(Λ).

Now consider L2(Λ)-orthogonal projection PN:L2(Λ)JN that, for any vL2(Λ):

(PNvv,ϕ)=0,ϕJN.

or equivalently

PNv(x)=i=0Nv^iJi(x),

In other words, let y be an arbitrary element in L2(Λ), since JN is finite dimensional subspace of L2, y has a unique best approximation y0JN such that

vJN,yy0yv,

so, for any vHr(Λ) and r 0 we have[40]:

PNvvcNrvr.(16)

Hence, the error of this approximation by increasing N will be decreased, in numerical examples, this principle will be shown.

2.2 Collocation method

Spectral methods, in the context of numerical schemes for solving differential equations, generically belong to the family of weighted residual methods (WRMs) [4143]. WRMs represent a particular group of approximation techniques, in which the residuals (or errors) are minimized in a certain way and thereby leading to specific methods including Galerkin, Petrov-Galerkin, collocation and tau formulations. consider the approximation of the following problem via spectral method:

u(x)+Pαu(x)+Nu(x)=f(x),(x)Ω,(17)

where is the differential or integral operator, Pa is fractional operator (differential or integral fractional operator), N is a lower-order linear and/or nonlinear operator involving only derivatives (if exist) and f (x) is a function of variables x, with enough initial and boundary conditions. The starting point of the spectral methods is to approximate the solution u(x) ∈ Hr(Ω) by a finite summation:

u(x)uN(x)=i=0Naiϕi(x),xΩ,(18)

where ϕn’s are the basis functions that we have chosen J^n(x) as the basis function and the expansion’s coefficients must be determined. Substituting u with uN in (17) leads to the residual function:

N(x)=uN(x)+PαuN(x)+NuN(x)f(x).(19)

Notice that, PαuN(x) is calculated by (12) and (15):

PαuN(x)=i=0NaiJ^nα(x).

The notion of the WRM is to force the residual function to zero in adequate norm by requiring:

<N,ψi>ω=0,0iNΩN(x)ψi(x)ω(x)dx=0,0iN(20)

where {ψk} are test functions, and ω is a positive weight function. The choice of test functions results to a kind of the spectral methods [41, 44]. A method for forcing the residual function (19) to zero, is the collocation algorithm [27, 44, 45]. In this method, by choosing Lagrange basis polynomials as test function, such that ψj(x) = Lj(x) and using Gauss quadrature rule in (20) we can write[41]:

<N,ψi>ω=j=0NN(xj)ψi(xj)ω(xj)Wq=0.0i,jN.(21)

Where xj is Gauss points and Wj is Gauss weights. If we use xj as collocation points and construct Lagrangian polynomial based on these points, according to Lagrange polynomials definition ψi(xj) = δij and by choosing ω = 1:

N(xj)=0,j=0,1,...,N.(22)

In this paper, since the FDEs (17) are nonlinear, the obtained system of equations (22) is nonlinear, too. To solve this nonlinear algebraic system, we use Newton–Krylov sub–space method [46, 47]. In this method for solving a nonlinear system of algebraic equations F(x) = 0, where F : ℝn → ℝn is a function F(x) = (f1(x), f2(x), f3(x), ..., fn(x))T and x ∈ ℝn is a vector. Speed and the accuracy of solving this nonlinear system are very important. Many works have been done to improve. One of the best methods to solve a nonlinear system is classical Newton’s iterative method:

F(xn+1)=F(xn)+(xnxn+1)F(xn),(23)

where F′(x) = J(x) is the n × n Jacobian matrix. Therefore:

xn+1=xnJ(xn)1F(xn).(24)

In fact, in each iteration, a linear system must be solved:

{xn+1=xn+δxnJ(xn)δxn=F(xn).(25)

Now, we apply the proposed method to solve equation (1) with initial condition y(0) = 0 in general form. To do this, we approximate the y(x) as follow:

Fig. 1 The graphs of the approximation solutions of Example 1 for N = 30 and α = 0.8, 0.85, 0.9, 0.95.
Fig. 1

The graphs of the approximation solutions of Example 1 for N = 30 and α = 0.8, 0.85, 0.9, 0.95.

3 Solving Some example of nonlinear Abel fractional differential equation of the first kind

In this section, we apply the proposed method which is described in section 2.2, to solve some examples of nonlinear Abel fractional differential equation of the first kind (1). All examples that are chosen to solve in this section have not analytical and semi–analytical solution.

In the all of the following examples, we use the roots of shifted Chebyshev polynomials as the collocation points, the initial guess of Newton–Krylov method is vector [1, 1, ..., 1]T and numbers of Newton–Krylov iterations maximum is 10.

Now, we use the generalized minimum residual method to solve obtained linear system in each Newton iteration. We have explained this method in previous work [46, 47].

y(x)yN(x)=i=1NaiJi^(x)J^N,(26)

then we construct the residual function as follows:

ResN(x)=DαyN(x)yN(x)3sin(x)                   +xyN(x)2x2yN(x)+x3

According to collocation technique, N nonlinear equation will be obtained via (20)–(22), then by solving this nonlinear system of equations by using Newton–Krylov the approximation solution yN(x) be achieved.

Example 1.

Consider the fist example of nonlinear Abel fractional differential equation of the first kind [32, 33]:

Dαy(x)=y(x)3sin(x)xy(x)2+x2y(x)x3,x(0,1],α(0,1)(27)

with the initial condition:

y(0)=0.(28)

This example has been solved by Xu and He by using the short memory principle (SMP) [33]. Also, Parand and Nikarya have solved this example by using a collocation method based on classical Bessel function [32].

Now, we have solved this example by employing the proposed method for α = 0.8, 0.85, 0.9 and 0.95. The obtained graphs of approximation solution yN(x) of Eq. (27) are shown in Fig. 1, also in Table 1 the values of yN(x) and Res(x) is compared with results of BFC method [32] and orthogonal fractional polynomials (OFP) method[48] for several. To show the accuracy and convergency of the present method to solve this example for α = 0.8, 0.85, 0.9 and 0.95, the graphs of residual function Res(x) is presented for several N in Fig. 2, in this these graphs, we showed that, by increasing the N the residual function decreases, to show the convergence of the presented method.

Fig. 2 The graphs of residual function to show convergence rate of the proposed method for solving Example 1 for α = 0.8, 0.85, 0.9, 0.95 and several N.
Fig. 2

The graphs of residual function to show convergence rate of the proposed method for solving Example 1 for α = 0.8, 0.85, 0.9, 0.95 and several N.

Fig. 3 The graphs of the approximation solutions of Example 2 for α = 0.8, 0.85, 0.9, 0.95 and N = 30.
Fig. 3

The graphs of the approximation solutions of Example 2 for α = 0.8, 0.85, 0.9, 0.95 and N = 30.

Example 2.

Consider the first kind Abel fractional differential equation:

Dαy(x)=exy(x)3y(x)2sin(x)+x2y(x)x3tan(αx)(29)

with initial conditions:

y(0)=0.(30)

We have solved Eq. (29) by the proposed method for α = 0.8, 0.85, 0.9 and 0.95. The graphs of approximation solution yN(x) are shown in Fig. 3, in Table 2 the values of yN(x) is presented for α = 0.8, 0.85, 0.9 and 0.95. Also to show the accuracy and convergency of the present method to solve this example for α = 0.8, 0.85, 0.9 and 0.95, the graphs of residual function Res(x) is presented for several N in Fig. 4, in this these graphs, we showed that, by increasing the N the residual function decreases.

Table 1

Comparison of obtained values of the proposed method and methods of [32, 48] for Example 1 for α = 0.8, 0.85, 0.9

xProposed methodOFP method [48]BFC method[32]
yN(x)Res(x)yN(x)Res(x)yN(x)Res(x)
α = 0.8
0.2−0.0007443425965.21e − 16−7.443e − 44.39e − 8−0.0007443472.34e − 7
0.4−0.0105220913341.41e − 18−1.052e − 23.00e − 8−0.0105220978.25e − 8
0.6−0.0510858837342.12e − 18−5.108e − 22.06e − 8−0.0510858884.23e − 7
0.8−0.1659259717994.84e − 16−1.659e − 14.53e − 8−0.1659259121.00e − 6
1.0−0.4693421303985.29e − 11−4.693e − 17.88e − 8−0.4693415398.71e − 5
α = 0.85
0.2−0.0006379693985.26e − 18____________−0.0006373255.21e − 6
0.4−0.0093173853951.02e − 19____________−0.0093161257.16e − 6
0.6−0.0459364569442.19e − 19____________−0.0459371479.43e − 6
0.8−0.1497057972395.53e − 17____________−0.1497086985.18e − 5
1.0−0.4149211341876.04e − 11____________−0.4149199884.36e − 4
α = 0.9
0.2−0.0005465215371.41e − 17−5.465e − 41.66e − 09−0.00054650313.26e − 6
0.4−0.0082487149223.63e − 20−8.248e − 31.06e − 09−0.00824827824.28e − 6
0.6−0.0413228241262.82e − 21−4.132e − 29.61e − 10−0.04132351468.33e − 6
0.8−0.1353497900844.30e − 18−1.353e − 19.78e − 10−0.13535081432.90e − 5
1.0−0.3701650194096.84e − 12−3.701e − 11.49e − 09−0.37016461462.31e − 4

Fig. 4 The graphs of residual function to show convergence rate of the proposed method for solving Example. 2 for α = 0.8, 0.85, 0.9, 0.95 and several N.
Fig. 4

The graphs of residual function to show convergence rate of the proposed method for solving Example. 2 for α = 0.8, 0.85, 0.9, 0.95 and several N.

Table 2

The values of approximation solution yN(x) of Example 2 for α = 0.8, 0.85, 0.9, 0.95 and N = 30

xα = 0.8α = 0.85α = 0.9α = 0.95
0.2−0.0005475041−0.0005222619−0.0004968084−0.0004718497
0.4−0.0053435740−0.0053795562−0.0053722684−0.0053332339
0.6−0.0161724534−0.0174150949−0.0183578125−0.0190602822
0.8−0.0240508103−0.0305890412−0.0359020939−0.0402140291
1.00.00457208778−0.0187336581−0.0379851769−0.0538981175

Table 3

The values of approximate solution yN(x) of Example 3 for α = 0.8, 0.85, 0.9, 0.95 and N = 30

xα = 0.8α = 0.85α = 0.9α = 0.95
0.20.033636163570.029619431040.026081938660.022960828432
0.40.121819166870.110531325120.100371528070.09118563054
0.60.262349383100.242531499730.224378916790.20768345736
0.80.440428317450.416467526450.393267007410.37093250960
10.592124717060.579616025780.565167432150.54897123418

Table 4

The values of approximate solution yN(x) of Example 4 for α = 0.85, 0.9, 0.95, N = 30 and α = 0.8, N = 120

xα = 0.8α = 0.85α = 0.9α = 0.95
0.10.00964410040.00820855610.00699574670.0059478742
0.30.07570647870.06748896440.06020601790.0537146181
0.50.21575623780.19501120850.17661056970.1601707949
0.70.48616876590.43658548960.39452798160.3581641713
0.91.23773428891.01062361350.86509440990.7594334013

Fig. 5 The graphs of the approximation solutions of Example 3 for N = 30 and α = 0.8, 0.85, 0.9, 0.95 and N = 30.
Fig. 5

The graphs of the approximation solutions of Example 3 for N = 30 and α = 0.8, 0.85, 0.9, 0.95 and N = 30.

Example 3.

Consider the fractional differential equation:

Dαy(x)=y(x)3cos2(x)+y(x)2sin(x)x2y(x)+tan(x)(31)

with conditions:

y(0)=0.(32)

We have solved Eq. (31) by the proposed method for α = 0.8, 0.85, 0.9 and 0.95. The graphs of obtained approximation solution yN(x) are shown in Fig. 5. Table 3 shows the values of yN(x) for α = 0.8, 0.85, 0.9 and 0.95. Also to show the accuracy and convergency of the present method to solve this example for α = 0.8, 0.85, 0.9 and 0.95, the graphs of residual function Res(x) is presented for several N in Fig. 6, in this these graphs, we showed that, by increasing the N the residual function decreases.

Example 4.

Consider the fractional differential equation:

Dαy(x)=x2y(x)3+xy(x)2+y(x)x+tan(x)(33)

with the initial condition:

y(0)=0.(34)

This example has not the exact or analytical solution, too. This example has been solved by Xu and He by using the short memory principle (SMP) [33].

We have solved Eq. (33) by the proposed method for α = 0.8, 0.85, 0.9 and 0.95. The graphs of the obtained approximation solution yN(x) are shown in Fig. 7. Table 4 shows the values of yN(x) for α = 0.8, 0.85, 0.9 and 0.95. Also to show the accuracy and convergency of the present method to solve this example for α = 0.8, 0.85, 0.9 and 0.95, the graphs of residual function Res(x) is presented for several N in Fig. 8, in this these graphs, we showed that, by increasing the N the residual function decreases.

Fig. 6 The graphs of residual function to show convergence rate of the proposed method for solving Example 3 for α = 0.8, 0.85, 0.9, 0.95 and several N
Fig. 6

The graphs of residual function to show convergence rate of the proposed method for solving Example 3 for α = 0.8, 0.85, 0.9, 0.95 and several N

Fig. 7 The graphs of the approximation solutions of Example 4 for α = 0.8, 0.85, 0.9, 95 and N = 30.
Fig. 7

The graphs of the approximation solutions of Example 4 for α = 0.8, 0.85, 0.9, 95 and N = 30.

4 Conclusion

The fractional calculus and fractional differential equations have found application in different sciences. But real and practical FDEs often have not exact or analytical solution, therefore, numerical solving of the fractional differential equations have become an attractive field of applied mathematics and computer science. In this article, we have introduced a new and high accurate numerical method based on generalized Bessel function (GBF) and collocation method to solve Abel fractional differential equation of the first kind. Also, in this paper, we have introduced an explicit formula to calculate Riemann–Liouville fractional derivative and integral of GBF, this formula causes the calculations be easier and faster. In the proposed method to solve obtained nonlinear algebraic systems, we use Newton–Krylov sub-space method. In this paper, we have solved the nonlinear Abel FDE of the first kind, that has not the exact or analytical solution. In this paper, we show the applicability and reliability of the proposed method to solve nonlinear FDEs.

Fig. 8 The graphs of residual function to show convergence rate of the proposed method for solving Example 4 for α = 0.8, 0.85, 0.9, 0.95 and several N
Fig. 8

The graphs of residual function to show convergence rate of the proposed method for solving Example 4 for α = 0.8, 0.85, 0.9, 0.95 and several N


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Acknowledgement

The corresponding author would like to thank Shahid Beheshti University for the awarded grant.

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Received: 2018-06-27
Revised: 2018-08-09
Accepted: 2018-09-30
Published Online: 2018-11-02
Published in Print: 2019-01-28

© 2019 K. Parand and M. Nikarya, published by De Gruyter.

This work is licensed under the Creative Commons Attribution 4.0 Public License.

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