Max-Planck-Institut für Mathematik in den Naturwissenschaften Leipzig
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1 Max-Planck-Institut für Mathematik in den Naturwissenschaften Leipzig A CAS Wavelet Method for Solving Nonlinear Fredholm Integro- Differential Equations of Fractional Order by Habib Allah Saeedi, Nasibeh Mollahasani, and Gennady Chuev Preprint no.: 4 2
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3 A CAS Wavelet Method for Solving Nonlinear Fredholm Integro- Differential Equations of Fractional Order H. Saeedi,3, M. Mohseni Moghadam 2, N. Mollahasani 3, G. N. Chuev 3,4 Department of Mathematics, Sahid Bahonar University of Kerman, Iran 2 Mahani Mathematical Research Center, Sahid Bahonar University of Kerman, Iran mohseni@mail.uk.ac.ir 3 Max Planck Institute for Mathematics in the Sciences (MIS) Inselstrasse 22-26, Leipzig 43, Germany mollahas@mis.mpg.de 4 Institute of Theoretical and Experimental Biophysics, Russian Academy of Science, Pushchino, Moscow Region 4229, Russia chuev@mis.mpg.de Abstract In this paper we present a computational method for solving a class of nonlinear Fredholm integro- differential equations of fractional order which is based on CAS (Cosine And Sine) wavelets. The CAS wavelet operational matrix of fractional integration is derived and used to transform the equation to a system of algebraic equations. some examples are included to demonstrate the validity and applicability of the technique. Keywords: fractional calculus, CAS wavelets, Fredholm integro- differential equations. 2 Mathematics Subject Classification: 65R2, 65T6, 26A33.
4 Introduction The conception of fractional calculus was first introduced in the middle of the 9th century. The use of fractional differential and integral operators in mathematical models has become increasingly widespread in recent years. However, it is in the past hundred years that the most fractional problems in engineering and scientific applications have been found. For example, the non- linear oscillation of earthquake can be modeled with fractional derivatives [4], and the fluid- dynamic traffic model with fractional derivatives can eliminate the deficiency arising from the assumption of continuum traffic flow [5], therefore differential equations with fractional order have recently proved to be valuable tools to the modeling of many physical phenomena [2, 8]. Also there are several techniques for solving such equations like Adomian decomposition method [23, 9], collocation method [22] and differential transform method []. Wavelets theory is a new and emerging area in mathematical research, it is very successfully used in signal analysis for waveform representation and segmentations, timefrequency analysis and fast algorithms for easy implementation [9, ]. However, the interest to the wavelet treatment of various integral equations has recently increased due to promising applications of this method in computational chemistry [4, 5, 6,, 2, 3]. The aim of this work is to present a numerical method (CAS wavelet method) for approximating the solution of a nonlinear fractional integro- differential equation of the second kind: D α f(x) λ with these supplementary conditions: k(x, t)[f(t)] q dt = g(x), q >, (.) f (i) () = δ i, i =,,..., r, r < α r, r N, (.2) where, g L 2 ([, )), k L 2 ([, ) 2 ) are known functions, f(x) is the unknown function, D α is the Caputo fractional differentiation operator and q is a positive integer. There are several definitions of a fractional derivative of order α >. The two most commonly used definitions are the Riemann- Liouville and Caputo. Each definition uses Riemann- Liouville fractional integration and derivatives of whole order. The Riemann- Liouville fractional integration of order α is defined as: J α f(x) = Γ(α) x (x t) α f(x)dt, x >, J f(x) = f(x), and the Caputo fractional derivatives of order α is defined as D α f(x) = J m α D m f(x), where D m is the usual integer differential operator of order m and J m α is the Riemann- 2
5 Liouville integral operator of order m α and m < α m. The relation between the Riemann- Liouville operator and Caputo operator is given by the following lemma [2]: Lemma.. If m < α m, m N, then D α J α f(x) = f(x), and: m J α D α f(x) = f(x) f (k) ( + ) xk k!, x >. k= The Caputo fractional derivative first computes an ordinary derivative followed by a fractional integral to achieve the desired order of fractional derivative. The Riemann- Liouville fractional derivative is computed in the reverse order. Therefore, the Caputo fractional derivative allows traditional initial and boundary conditions to be included in the formulation of the problem, but the Riemann- Liouville fractional derivative allows initial conditions in terms of fractional integrals and their derivatives. So we first define CAS wavelets and Block Pulse Functions and approximating a function via them, then we introduce the operational matrix of fractional integration. After that the method is described and the error is analyzed. Finally numerical results are shown in figures and tables. 2 Function Approximation In this section first we give some necessary definitions and mathematical preliminaries of CAS wavelets and Block Pulse Functions (BPFs) which are used further in this paper. Then function approximation via these two conceptions is introduced. The CAS wavelets employed in this paper are defined as: { 2 k/2 CAS m (2 k x n), if n x < n+ ; ψ n,m (x) = 2 k 2 k, otherwise, where: CAS m (x) = cos(2mπx) + sin(2mπx), and n =,,..., 2 k, k N {}, m Z. It is clear that CAS wavelets have compact support i. e: Supp(ψ n,m (x)) = {x : ψ n,m (x) } = [ n 2 k, n + 2 k ]. Let us introduce the following useful notation, corresponding to CAS wavelets here: { 2 ψ k/2 CAS m (n 2 k x), if n x < n+ ; n,m (x) = 2 k 2 k, otherwise. 3
6 An m-set of Block Pulse Functions (BPFs) over the interval [, T ) is defined as: { it, if b i (x) = m x < (i+)t m ; i =,, 2,..., m,, otherwise, with a positive integer value for m. In this paper, it is assumed that T =, so BPFs are defined over [, ). Now we explain some useful properties of BPFs: Disjointness : b i (x)b j (x) = { b i (x), i = j;, i j. (2.) Orthogonality : b i (x)b j (x)dx = { /m, i = j;, i j. (2.2) Completeness : For every f L 2 ([, )), the sequence {b i } is complete if b i f = results in f = almost every where. Because of completeness of {b i (x)},, Parsevals identity holds, i. e. we have f 2 (x)dx = i= f i 2 b i(x) 2, for every real bounded function f(x) L 2 ([, )) and: f i = m BPFs have compact support i. e Supp(b i (x)) = [ i m, i+ m ]. b i (x)f(x)dx. (2.3) The set of CAS wavelets forms an orthonormal basis for L 2 ([, )). This implies that any function f(x) defined over [, ) can be expanded as: f(x) = = c n,m ψ n,m (x) n= m Z 2 k M n= m= M = c T Ψ(x), c n,m ψ n,m (x) where c n,m =< f(x), ψ n,m (x) >= f(x)ψ n,m(x)dx, and < f, g > is the inner product of the function f and g, c and Ψ are 2 k (2M + ) vectors given bye: c = [c, M, c, M+,..., c,m, c, M,..., c,m,..., c 2 k, M,..., c 2 k,m] T, Ψ(x) = [ψ, M, ψ, M+,..., ψ,m, ψ, M,..., ψ,m,..., ψ 2 k, M,..., ψ 2 k,m]. 4
7 Notation. From now we define m = 2 k (2M + ), such that k, M N {}. Also from the orthogonality property of BPFs, it is possible to expand functions into their Block- Pulse series [2], this means that For every f(x) L 2 ([, )) we can write: f(x) = m i= f i b i (x) = f T B m (x), (2.4) where: f = [f, f,..., f m ] T, B m (x) = [b (x), b (x),..., b m (x)], such that f i for i =,,..., m are obtained by Eq. (2.3). 3 Operational Matrix of Fractional Integration Eq. (2.4) implies that CAS wavelets can be also expanded into an m -term BPFs as: ψ nm (x) = m i= f i b i (x). By using the properties of CAS wavelets and Eq. (2.3) we have: (i+)/m f i = m ψ nm (x)dx = = i/m m 2 k/2 i + 2 k/2+ mπ {sin(2mπ(2k m n)) sin(2mπ(2 k i m n)) cos(2mπ(2 k i + m n)) + cos(2mπ(2 k i m n))} m 2 k/2+ mπ { ψ nm ( i m ) ψ nm ( i + m )}, for i = n(2m + ),..., (n + )(2M + ) and otherwise f i =. Therefor we get: ψ nm (x) m = 2 k/2+ [,,...,, mπ }{{} ψ nm ( i m ) ψ nm ( i + m ),..., ψ nm ( i + 2M m ) ψ nm ( i + 2M + m ), n(2m+),..., ]B m (x) where i = n(2m + ), n =,,..., 2 k and m = M,..., M. Therefore: Ψ(x) = Φ m m B m (x), (3.) 5
8 where Φ m m = Diag(Φ, Φ,..., Φ 2 k ), and Φ n for n =,,..., 2 k is a (2M + ) (2M + ) matrix which is introduced as: Φ n = Λ ([ Ψn ( i m ) Ψn ( i+ m )... Ψn ( i+2m m ) ] [ Ψn ( i+ m ) Ψn ( i+2 m )... Ψn ( i+2m+ m ) ]), where: Λ = m 2 k/2+ π M M. M M+... M M+... M.. M+... M, Ψ n (x) = [ ψn, M (x) ψn, M+ (x)... ψn,m (x) ] T. Kilicman and Al Zhour (see [6] ) have given the Block Pulse operational matrix of fractional integration F α as follows: (J α B m )(x) = F α B m (x), (3.2) where: ξ ξ 2 ξ 3... ξ m ξ ξ 2... ξ m 2 F α = ξ... ξ m m α 3 Γ(α + 2) ξ..., and ξ k = (k + ) α+ 2k α+ + (k ) α+. Let: where matrix P α m m is called the CAS wavelet operational matrix of fractional integration. Using Eqs. (3.) and (3.2), we have: (J α Ψ m )(x) = P α m m Ψ m (x), (3.3) (J α Ψ m )(x) = (J α Φ m m B m )(x) = Φ m m (J α B m )(x) = Φ m m Fα B m (x). (3.4) By Eqs. (3.3)and (3.4), we get: P α m m Ψ m (x) = Φ m m Fα B m (x), therefore the CAS wavelet operational matrix of fractional integration P α m m is given by: P α m m = Φ m m Fα Φ m m. 6
9 4 Application of the Method Consider Eq. (.), by previous section, the two variable function k(x, t) L 2 ([, )) 2 can be approximated as: k(x, t) = 2 k M 2 k M n= l = M m= l 2 = M k i,j ψ n,l (x)ψ m,l2 (t), for i = n(2m + ) + l + M +, j = m(2m + ) + l 2 + M +, or in the matrix form: k(x, t) = Ψ T (x)kψ(t), (4.) where K = [k i,j ] and k i,j =< ψ n,l (x), < k(x, t), ψ m,l2 (t) >>. Also the right hand side of Eq. (.) can be written as: g(x) = g T Ψ(x). (4.2) Now, let: D α f(x) = c T Ψ(x). (4.3) For simplicity, we can assume that δ i = (in the supplementary conditions (.2)). Hence by using lemma. and Eqs. (4.3) and (3.3) we have: According to Eq. (3.), from above equation we get: f(x) = c T P α m m Ψ(x). (4.4) f(x) = c T P α m m Φ m m B m (x). Define: a = [a, a,..., a m ] = c T P α m m Φ m m, so, f(x) = a B m (x). From the disjoint property of the BPFs, we have: [f(x)] 2 = [a Bm (x)] 2 = [a b (x) + a b (x) a m b m (x)] 2 = a 2 b (x) + a 2 b (x) a 2 m b m (x) = [a 2, a 2,..., a 2 m ]B m (x) = ã 2 B m (x), and it is easy to show by induction that: [f(x)] q = [a q, aq,..., aq m ]B m (x) = ã qb m (x), (4.5) 7
10 where: ã q = [a q, aq,..., aq m ], for all positive integers q. Using Eqs. (3.), (4.) and (4.5) we will have: k(x, t)[f(t)] q dt = = Ψ T (x)kψ(t)b T m (t)ã q T dt Ψ T (x)kφ m m B m (t)bt m (t)ãt q dt = Ψ T (x)kφ m m B m (t)b T m (t)ãt q dt. (4.6) By using properties Eqs. (2.) and (2.2), we simplify the integral part of (4.6) as: B m (t)b T m (t)ãt q dt = Thus in (4.6) we have: = b (t) { O b (t)... O b m (t) a q a q. a q m [a q b (t), a q b (t),..., a q m b m (t)] T dt = m [aq, aq,..., aq m ]T = m ãq. }dt k(x, t)[f(t)] q dt = m ΨT (x)kφ m m ã q. (4.7) By substituting the approximations (4.2), (4.3) and (4.7) into (.) we obtain: Ψ(x) T c λ m ΨT (x)kφ m m ã q = Ψ(x) T g. (4.8) Now, by multiplying two sides of (4.8) in Ψ(x) then integration in the interval [, ], according to orthonormality of CAS wavelets we get: c λ m KΦ m m ã q = g which is a nonlinear system of algebraic equations. By solving this system we can obtain the approximate solution of Eq. (.) according to Eq. (4.4). 8
11 Figure. 5 Error Analysis We can easily check the accuracy of the method. Since the truncated CAS wavelet series is an approximate solution of Eq. (.), when the approximate functions (4.2), (4.3) and (4.7) are substituted in Eq.(.), the resulting equation, (4.8), must be satisfied approximately, that is for x [, ) R m (x) = Ψ(x) T c λ m ΨT (x)kφ m m ã q Ψ(x) T g =. If we set x = x i, then our aim is to have R m (x i ) r i, where r i is any positive integer. If we prescribe, Max{r i } = r, then we increase m as long as the following inequality holds at each point x r : R m (x i ) r, in other words, by increasing m the error function R m (x i ) approaches zero. If R m (x) when m is sufficiently large enough, then the error decreases. 6 Numerical Examples To show the efficiency of the proposed method, we consider the following examples. Note that: e m (x) 2 = ( e 2 m (x)dx)/2 = ( N N e 2 m (x i)) /2, i= 9
12 Figures 2. where e m (x i ) = f(x i ) f m (x i ), i =,,..., N. f(x) is the exact solution and f m (x) is the approximate solution which is obtained by Eq. (4.4). And also consider that all of the computations have been done by MATLAB 7.8. Example 6.. Consider the following fractional nonlinear integro- differential equation: D α f(x) xt[f(t)] 2 dt = x, x <, < α, 4 with this supplementary condition f() =. Figure shows the numerical results for k = 4, M = and various < α. The comparisons show that as α, the approximate solutions tend to f(x) = x, which is the exact solution of the equation in the case of α =. The error in the case α =, for different values of k and M, is shown in Table. Example 6.2. Consider equation: D 2 f(x) xt[f(t)] 4 dt = g(x), x <, such that f() = and g(x) = Γ(/2) ( 8 3 x 3 2 x) x 26. From figure 2 and table, we can see the numerical solutions are in a very good agreement with the exact solution, f(x) = x 2 x. Example 6.3. Consider the following equation, of order α = 5 6 : D 5 6 f(x) xe t [f(t)] 2 dt = g(x), x <,
13 Figures 3. where g(x) = 3 Γ(/6) (2 6 6 x x 3 )+x(248e 674), with these supplementary conditions f() = f () =. Figure 3 shows the behavior of the numerical solutions for various k and M, which are in agreement with the exact solution, f(x) = x x 3. The error for different values of k and M, is shown in Table. Example 6.4. Consider the following nonlinear Fredholm integro- differential equation, of order α = 5 3 : D 5 3 f(x) (x + t) 2 [f(t)] 3 dt = g(x), x <, where g(x) = 6 Γ(/3) 3 x x2 7 x 4 9, with these supplementary conditions f() = f () =. Figure 4 shows the numerical solutions for various k and M, with the exact solution, f(x) = x 2. The error for different values of k and M, is shown in Table. Examples e 2 2 (k = 2, M = ) e 24 2 (k = 3, M = ) e 48 2 (k = 4, M = ) Example e e e-5 Example e e e-6 Example e e e-4 Example e e e-5 Table.
14 Figures 4. 7 Conclusion In this work we derive CAS wavelet operational matrix of fractional integration, and use it to solve a class of nonlinear Fredholm integro- differential equation of fractional (arbitrary) order. Several examples are given to demonstrate the powerfulness of the proposed method. The solution is convergent, even though the size of increment may be large. Also this method can be used to obtain the numerical solutions of ordinary nonlinear integro- differential equations. The method is in the case of the fractional Fredholm integral equations, which is interest of current applications in computational chemistry [2, 3, 7, 8]. Acknowledgment The authors are thankful to Prof. M. V. Fedorov for his supports, and they also acknowledge the Max Planck Institute for Mathematics in the Sciences (MPI MIS, Leipzig). This work has been partially supported by the Mahani mathematical research center and the center of excellent in linear algebra and optimization of Shahid Bahonar University of Kerman too. 2
15 References [] G. Beylkin, R. Coifman, V. Rokhlin, Fast wavelet transforms and numerical algorithms, I, Commun. Pure Appl. Math. 44 (99) [2] S. Chiodo, G. N. Chuev, S. E. Erofeeva, M. V. Fedorov, N. Russo, E. Sicilia, Comparative study of electrostatic solvent response by RISM and PCM methods, International Journal of Quantum Chemistry, 7, (27). [3] G. N. Chuev, S. Chiodo, S. E. Erofeeva, M. V. Fedorov, N. Russo, E. Sicilia, Quasilinear RISM- SCF Approach for Computing Solvation Free Energy of Molecular Ions, Chemical Physics Letters 48, (26). [4] G. N. Chuev and M. V. Fedorov. Density Functional Method Based on Wavelets for Quantum- Classical Systems; International Journal of Quantum Chemistry,, (4) (24). [5] G. N. Chuev and M. V. Fedorov, Wavelet treatment of structure and thermodynamics of simple liquids; Journal of Chemical Physics, 2, 9-96 (24). [6] G. N. Chuev and M. V. Fedorov, Wavelet algorithm for solving integral equations of molecular liquids. A test for reference interaction site model; Journal of Computational Chemistry, 25, (24). [7] G. N. Chuev, M. V. Fedorov, S. Chiodo, N. Russo, E. Sicilia, Hydration of ionic species studied by the reference interaction site model with a repulsive bridge correction Journal of Computational Chemistry, 29, (4) (28). [8] G. N. Chuev, M. V. Fedorov, J. Crain, Improved estimates for hydration free energy obtained by the reference interaction site model Chemical Physics Letters, (27). [9] C. K. Chui, Wavelets, A mathematical Tool for Signal Analysis, SIAM, Philadelphia PA, 997. [] V. S. Erturk, S. Momani, Z. Odibat, Application of generalized differential transform method to multi-order fractional differential equations, Commun. Nonlinear Sci. Numer. Simulat. 3 (28) [] M. V. Fedorov, G. N. Chuev, Yu. A. Kuznetsov, E. G. Timoshenko, Wavelet treatment of the intrachain correlation functions of homopolymers in dilute solutions; Physical Review E 7, (24). [2] M. V. Fedorov, H-J. Flad, G. N. Chuev, L. Grasedyck, and B.N. Khoromskij, A Structured Low-Rank wavelet solver for the Ornstein-Zernike integral equation, Computing, 8, (27). [3] M. V. Fedorov and G. N. Chuev, Wavelet method for solving integral equations of simple liquids; Journal of Molecular Liquids, 2, (25). [4] J. H. He, Nonlinear oscillation with fractional derivative and its applications, in: International Conference on Vibrating Engineering98, Dalian, China, 998, pp
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