A NEW VARIABLE-COEFFICIENT BERNOULLI EQUATION-BASED SUB-EQUATION METHOD FOR SOLVING NONLINEAR DIFFERENTIAL EQUATIONS

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1 U.P.B. Sci. Bull., Series A, Vol. 76, Iss., 014 ISSN A NEW VARIABLE-COEFFICIENT BERNOULLI EQUATION-BASED SUB-EQUATION METHOD FOR SOLVING NONLINEAR DIFFERENTIAL EQUATIONS Bin Zheng 1 In this paper, a new variable-coefficient Bernoulli equation-based subequation method is proposed to establish exact solutions for nonlinear differential equations. For illustrating the validity of this method, we apply it to the (1)- dimensional breaking soliton equation and the (1)-dimensional dispersive long wave equations. As a result, some new exact solutions for them are successfully obtained. Keywords: Variable-coefficient sub-equation method; Bernoulli equation; Breaking soliton equation; Dispersive long wave equations; Nonlinear differential equation; Exact solution. MSC010: 5Q51, 5Q5. 1. Introduction Nonlinear differential equations (NLDEs) can be used to describe many nonlinear phenomena such as fluid mechanics, plasma physics, optical fibers, biology, solid state physics, chemical kinematics, chemical physics, and so on. In the research of the theory of NLDEs, searching for more explicit exact solutions to NLDEs is one of the most fundamental and significant study in recent years. With the help of computerized symbolic computation, much work has been focused on the various extensions and applications of the known algebraic methods to construct the solutions to NLDEs. There have been a variety of powerful methods. For example, these methods include the known homogeneous balance method [1,], the tanh-method [-5], the inverse scattering transform [6], the Backlund transform [7,8], the Hirotas bilinear method [9,10], the generalized Riccati sub-equation method[11,1], the Jacobi elliptic function expansion [1,14], the F-expansion method [15], the expfunction expansion method [16,17], the (G /G)-expansion method [18,19] and so on. However, we notice that most of the existing methods are companied with constant coefficients, while very few methods are concerned of variable-coefficients. In this paper, by introducing a new ansatz, we develop a new variable-coefficient Bernoulli equation-based sub-equation method for solving NLDEs. First we give the description of the variable-coefficient Bernoulli equation-based sub-equation method. Then we apply the method to solve the (1)-dimensional breaking soliton equation and the (1)-dimensional dispersive long wave equations. Some conclusions are presented at the end of the paper. 1 Researcher, School of Sciences, Shandong University Of Technology, Zibo, Shandong, 55049, China, zhengbin601@16.com zhengbin601@16.com 6

2 64 Bin Zheng. Description of the variable-coefficient Bernoulli equation-based sub-equation method We consider the following Bernoulli equation: G λg = G, (1) where λ 0 is a complex number, G = G(ξ). The solutions of Eq. (1) is denoted by λ G(ξ) =, () λξ 1 λde where d is an arbitrary constant. Especially, when λ is a real number and d = 1 λ, we obtain G(ξ) = λ (1 tanh(λξ )). () When d = λ 1, λ = i λ, where λ is a real number, i is the unit of imaginary number, we obtain G(ξ) = λ λi tan( λξ ). (4) Suppose that a nonlinear equation, say in two or three independent variables x, y, t, is given by P (u, u t, u x, u y, u tt, u xt, u xx, u xy...) = 0, (5) where u = u(x, y, t) is an unknown function, P is a polynomial in u = u(x, y, t) and its various partial derivatives, in which the highest order derivatives and nonlinear terms are involved. Step 1. Suppose that u(x, y, t) = u(ξ), ξ = ξ(x, y, t), (6) and then Eq. (5) can be turned into the following form P (u, u, u,...) = 0. Step. Suppose that the solution of (7) can be expressed by a polynomial in G as follows: u(ξ) = a m (x, y, t)g m a m 1 (x, y, t)g m 1... a 0 (x, y, t), (7) where G = G(ξ) satisfies Eq. (1), and a m (x, y, t), a m 1 (x, y, t),..., a 0 (x, y, t) are all unknown functions to be determined later with a m (x, y, t) 0. The positive integer m can be determined by considering the homogeneous balance between the highest order derivatives and nonlinear terms appearing in (7). Step. Substituting (8) into (7) and using (1), collecting all terms with the same order of G together, the left-hand side of (7) is converted to another polynomial in G. Equating each coefficient of this polynomial to zero, yields a set of partial differential equations for a m (x, y, t), a m 1 (x, y, t)..., a 0 (x, y, t), ξ(x, y, t), λ. Step 4. Solving the equations system in Step, and using the solutions of Eq. (1), we can construct exact coefficient function solutions of Eq. (7). Remark.1. As the partial differential equations in Step are usually over-determined, we may choose some special forms of a m, a m 1,..., a 0 as will be done in the following.

3 Variable-coefficient Bernoulli Sub-equation Method 65. Applications of the proposed method In this section, we will present some applications of the method described in Section..1. (1)-dimensional breaking soliton equation We consider the (1)-dimensional breaking soliton equation [0-]: u xxxy u y 4u x u xy u xt = 0. (8) Eq. (9) is used to describe the (1)-dimensional interaction of Riemann wave propagated along the y-axis with long wave propagated along the x-axis []. Some types of exact solutions for Eq. (9) have been obtained by the Riccati sub-equation method [0, 1] and the symbolic computation method []. To apply the method described above, we assume that u(x, y, t) = U(ξ), where ξ = ξ(x, y, t). Then Eq. (9) can be turned into ξ xξ y U (ξ xξ xy ξ x ξ y ξ xx )U (ξ xy ξ xx ξ x ξ xxy ξ xxx ξ y ξ x ξ t )U (ξ xxxy ξ y ξ xt )U 4ξ x ξ xy U 4ξxξ y U U = 0. (9) We will proceed to solve Eq. (10) in two cases. Case 1: Assume that U(ξ) = m i=0 a i(y, t)g i. By balancing the order of U and U U in Eq. (10), we can obtain m = 1. So U(ξ) = a 1 (y, t)g a 0 (y, t). (10) Substituting (1) into (10) and collecting all the terms with the same power of G together, equating each coefficient to zero yields a set of under-determined partial differential equations for a 0 (y, t), a 1 (y, t) and ξ(x, y, t). Solving these equations with the aid of Maple software yields F amily 1: ξ(x, y, t) = x f(t), a 1 (y, t) = 4, a 0(y, t) = f (t)y g(t), where is an arbitrary constant, and f(t), g(t) are two arbitrary functions. Combining with Eq. () we can obtain the following exact solutions for (1)- dimensional breaking soliton equation: u 1 (x, y, t) = 4 [ λ 1 λde λ(xf(t)) ] f (t)y g(t). (11) In the special case of Eq. () we obtain the following solitary wave solutions: u (x, y, t) = 4 [λ (1 tanh(λ(x f(t)) ))] f (t)y g(t). (1) Using Eq. (4) we obtain the following trigonometric function solutions: u (x, y, t) = 4 [λ λi tan( λ( x f(t)) ))] f (t)y g(t). (1)

4 66 Bin Zheng F amily : ξ(x, y, t) = C (C e xc 4 e xc 4 ), a 1 (y, t) = C 5, a 0 (y, t) = f(t), where C i, i = 1,,, 4, 5 are an arbitrary constant, and f(t) is an arbitrary function. Combining with Eq. () we can obtain the following exact solutions: u 4 (x, y, t) = Case : Assume that C 5 λ 1 λde λ[c (C e xc 4 xc 4 f(t). (14) e )] U(ξ) = m a i (x)g i. (15) i=0 Similarly, by balancing the order of U and U U in Eq. (10), we can obtain m = 1. So U(ξ) = a 1 (x)g a 0 (x). (16) Substituting (18) into (10) and collecting all the terms with the same power of G together, equating each coefficient to zero yields a set of under-determined partial differential equations for a 0 (x), a 1 (x) and ξ(x, y, t). Solving these equations yields F amily : ξ(x, y, t) = F 1 (y) F (x), a 1 (x) = F (x), F a 0 (x) = (x)f (x) 4λF (x)f (x) F (x) λ F 4 (x) 4F, (x) where is an arbitrary constant, and F 1 (y), F (x) are two arbitrary functions with respect to the variable y and x respectively. Then we have F u 5 (x, y, t) = (x)λ 1 λde λ(f 1(y)F (x)) F (x)f (x) 4λF (x)f (x) F (x) λ F 4 (x) 4F. (17) (x) F amily 4: ξ(x, y, t) = F 1 (y), a 1 (x) = 1 (x C ) 1 ± i (x C ) 1, a 0 (x) = C ( x C ) 1 5 6( x C ) C 4, where C i, i = 1,,, 4 are arbitrary constants, and F 1 (y) is an arbitrary function. Then we have u 6 (x, y, t) = λ[ 1 (x C ) 1 ± i (x C ) 1 ] 1 λde λf 1(y) C ( x C ) 1 5 6( x C ) C 4. (18)

5 Variable-coefficient Bernoulli Sub-equation Method 67 F amily 5: ξ(x, y, t) = F 1 (y), a 1 (x) = ( x C ) 1, a 0 (x) = C ( x C ) 1 5 6( x C ) C 4, where C i, i = 1,,, 4 are arbitrary constants, and F 1 (y) is an arbitrary function. Then we have u 7 (x, y, t) = λ(x C ) 1 1 λde λf 1(y) F amily 6: C ( x C ) 1 5 6( x C ) C 4. (19) ξ(x, y, t) = t F 1 (y), a 1 (x) = C, a 0 (x) = C x C 4, where C i, i = 1,,, 4 are arbitrary constants, and F 1 (y) is an arbitrary function. Then we have λc u 8 (x, y, t) = 1 λde λ(tf 1 (y)) C x C 4. (0) F amily 7: ξ(x, y, t) = t C C y, a 1 (x) = 1 (C 4x C 5 ) 1 ± i (C 4x C 5 ) 1, (6C C a 0 (x) = 4C 6 x 7C C 4 C 5 C 6 x 6C C5C 6 ) dx, 6C (C 4 x C 5 ) 8 (9C1 C 4x 18 C 4 C 5 x 9 C5 5C C4)(C 4 x C 5 ) dx C 6C (C 4 x C 5 ) 8 7, where C i, i = 1,,..., 7 are arbitrary constants. Then we have λ[ 1 u 9 (x, y, t) = (C 4x C 5 ) 1 ± i (C 4x C 5 ) 1 ] 1 λde λ(tc C y) (6C C 4C 6 x 7C C 4 C 5 C 6 x 6C C5C 6 ) dx, 6C (C 4 x C 5 ) 8 (9C1 C 4x 18 C 4 C 5 x 9 C5 5C C4)(C 4 x C 5 ) dx C 6C (C 4 x C 5 ) 8 7. (1) F amily 8: ξ(x, y, t) = t C C y, a 1 (x) = (C 4 x C 5 ) 1, (6C C a 0 (x) = 4C 6 x 7C C 4 C 5 C 6 x 6C C5C 6 ) dx, 6C (C 4 x C 5 ) 8 (9C1 C 4x 18 C 4 C 5 x 9 C5 5C C4)(C 4 x C 5 ) dx C 6C (C 4 x C 5 ) 8 7, where C i, i = 1,,..., 7 are arbitrary constants. Then we have u 10 (x, y, t) = λ(c 4x C 5 ) 1 1 λde λ(tc C y)

6 68 Bin Zheng (6C C 4C 6 x 7C C 4 C 5 C 6 x 6C C5C 6 ) dx, 6C (C 4 x C 5 ) 8 (9C1 C 4x 18 C 4 C 5 x 9 C5 5C C4)(C 4 x C 5 ) dx C 6C (C 4 x C 5 ) 8 7. () F amily 9: C ξ(x, y, t) = [ ( y C )(C 1) ] C 1 C, C 4 a 1 (x) = 1 (C 5x C 6 ) 1 ± i (C 5x C 6 ) 1, a 0 (x) = C 7(C 5 x C 6 ) 1 5C 5 C 5 6(C 5 x C 6 ) C 8, where C i, i = 1,,..., 8 are arbitrary constants. Then we have F amily 10: u 11 (x, y, t) = λ[ 1 (C 5x C 6 ) 1 ± i (C 5x C 6 ) 1 ] C λ[ 1 λde ( y C )(C 1) C 4 ] C 1 C C 7(C 5 x C 6 ) 1 5C 5 C 5 6(C 5 x C 6 ) C 8. () ξ(x, y, t) = F 1 (x) C ln[ (C y C 4 ) ], a 1 (x) = F 1(x), F a 0 (x) = 1 (x)f 1 (x) 4λF 1 (x)f 1 (x) F 1 (x) λ F 1 4 (x) 4F 1, (x) where C i, i = 1,,, 4 are arbitrary constants, and F 1 (x) is an arbitrary function. Then we have λf u 1 (x, y, t) = 1(x) C λ(f 1 (x) C ln[ 1(C y C 4 ) 1 λde C ]) F 1 (x)f 1 (x) 4λF 1 (x)f 1 (x) F 1 (x) λ F 1 4 (x) 4F 1. (4) (x) C Remark.1. In Families -10, if we use Eqs. ()-(4), then we also obtain corresponding hyperbolic function solutions and trigonometric function solutions as the analysis in Family 1, which are omitted here. Remark.. We note that the established exact solutions for the (1)-dimensional breaking soliton equation above are different from those in [0-] essentially as we have used a new variable-coefficient method based on a different Bernoulli subequation here, and are new exact solutions which have not been reported by other authors in the literature.

7 Variable-coefficient Bernoulli Sub-equation Method 69.. (1)-dimensional dispersive long wave equation 7]: We consider the known (1)-dimensional dispersive long wave equations [4- u yt v xx (uu x ) y = 0, (5) v t u x (uv) x u xxy = 0, (6) Some types of exact solutions for Eqs. (7)-(8) have been obtained in [4-7] by use of various methods including the Riccati sub-equation method [4, 5, 0], the nonlinear transformation method [6], Jacobi function method [8, 9, 7], (G /G)- expansion method [7], modified CK s direct method [1], EXP-function method [], Hopf-Cole transformation method [], modified extended Fan s sub-equation method [4, 5], generalized algebraic method [6]. To apply the proposed method, similar to the process above, we assume that u(x, y, t) = U(ξ), ξ = ξ(x, y, t), and suppose m n U(ξ) = a i (y, t)g i, V (ξ) = b i (y, t)g i, (7) i=0 where G = G(ξ) satisfies Eq. (1). By balancing the highest order derivatives and nonlinear terms in Eqs. (7)-(8) we have m = 1, n =. So U(ξ) = a 1 (y, t)g a 0 (y, t), V (ξ) = b (y, t)g b 1 (y, t)g b 0 (y, t), (8) Combining (7), (8), (0), collecting all the terms with the same power of G together, equating each coefficient to zero yields a set of under-determined partial differential equations for a 0 (y, t), a 1 (y, t), b 0 (y, t), b 1 (y, t), b (y, t) and ξ(x, y, t). Solving these equations with the aid of Maple software yields F amily 1: ξ(x, y, t) = x 1 i=0 F 1 (t)dt 1 4 λt 1 tf (y) F (y), a 1 (y, t) =, a 0 (y, t) = F 1 (t) F (y), b (y, t) = (tf (y) F (y)), b 1 (y, t) = λ(f (y) t F (y)), b 0 (y, t) = F (y) 1, where is an arbitrary constant, and F 1 (t), F (y), F (y) are arbitrary functions. Combining with Eq. () we can obtain the following exact solutions for the (1)- dimensional dispersive long wave equation: λ u 1 (x, y, t) = [ 1 λde λ[x 1 C1 F 1 (t)dt 1 4 Cλt 1 ] F 1 (t) F (y), 1 tf (y)f (y)] (9) v 1 (x, y, t) = (tf (y) F (y))

8 70 Bin Zheng λ [ 1 λde λ[x 1 C1 F 1 (t)dt 1 4 Cλt 1 ] 1 tf (y)f (y)] λ(f (y) t F (y))[ λ 1 λde λ[x 1 C1 F 1 (t)dt 4 1 Cλt 1 ] 1 tf (y)f (y)] F (y) 1. (0) In the special case of Eq. () we obtain the following solitary wave solutions: λ[ x 1 {1 tanh( λ[ x 1 {1 tanh( λ[ x 1 {1 tanh( u (x, y, t) = λ F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} F 1 (t) F (y), (1) v (x, y, t) = λ ( tf (y) F (y)) 8 F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} λ (F (y) t F (y)) F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} F (y) 1. () Using Eq. (4) we obtain the following trigonometric function solutions: {1 itan( λ[ x 1 {1 itan( {1 itan( F amily : λ[ x 1 λ[ x 1 ξ(x, y, t) = x 1 u (x, y, t) = λ F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} F 1 (t) F (y), () v (x, y, t) = λ ( tf (y) F (y)) 8 F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} λ (F (y) t F (y)) F 1 (t)dt 1 4 λt 1 tf (y) F (y)] )} F (y) 1. (4) F 1 (t)dt 1 4 λt 1 tf (y) F (y), a 1 (y, t) =, a 0 (y, t) = F 1 (t) F (y),

9 Variable-coefficient Bernoulli Sub-equation Method 71 b (y, t) = (tf (y) F (y)), b 1 (y, t) = λ(f (y) t F (y)), b 0 (y, t) = F (y) 1, where is an arbitrary constant, and F 1 (t), F (y), F (y) are arbitrary functions. Then combining with Eq. () we obtain the following exact solutions: λ u 4 (x, y, t) = 1 λde λ[ x 1 C1 F 1 (t)dt 1 4 Cλt1 F 1 (t) F (y), 1 tf (y)f (y)] (5) v 4 (x, y, t) = ( tf (y) F (y)) λ { 1 λde λ[ x 1 C1 F 1 (t)dt 1 4 Cλt1 } 1 tf (y)f (y)] λ(f (y) t F (y)) λ { 1 λde λ[ x 1 C1 F 1 (t)dt 1 4 Cλt1 } F (y) 1. (6) 1 tf (y)f (y)] F amily : ξ(x, y, t) = x F 1 (t)dt C1λt F (y), a 1 (y, t) = ±, a 0 (y, t) = F 1 (t), b (y, t) = F (y), b 1 (y, t) = λf (y), b 0 (y, t) = 1, where is an arbitrary constant, and F 1 (t), F (y) are arbitrary functions. Then we have ± λ u 5 (x, y, t) = 1 λde λ[c F 1x F1 (t)dt C 1(t), 1 λtf (y)] (7) v 5 (x, y, t) = F (y){ λ 1 λde λ[c 1x F1 (t)dt C1 λtf (y)] } λf (y){ λ 1 λde λ[c } 1. 1x F1 (t)dt C1 λtf (y)] (8) F amily 4: ξ(x, y, t) = x F 1 (y), a 1 (y, t) = ±, a 0 (y, t) = λ, b (y, t) = F 1(y), b 1 (y, t) = λf 1(y), b 0 (y, t) = 1, where is an arbitrary constant, and F 1 (y) is an arbitrary function. Then we have ± λ u 6 (x, y, t) = 1 λde λ[xf 1 (y)] λ, (9) v 6 (x, y, t) = F 1(y){ λ 1 λde λ[xf 1 (y)] } λf 1(y){ λ 1 λde λ[c } 1. (40) 1xF 1 (y)]

10 7 Bin Zheng F amily 5: ξ(x, y, t) = x C t F 1 (y), a 1 (y, t) = ±, a 0 (y, t) = λ C, b (y, t) = F 1(y), b 1 (y, t) = λf 1(y), b 0 (y, t) = 1, where, C are arbitrary constants, and F 1 (y) is an arbitrary function. Then we have ± λ u 7 (x, y, t) = 1 λde λ[xc tf 1 (y)] λ C, (41) v 7 (x, y, t) = F 1(y){ λ 1 λde λ[xc tf 1 (y)] } λf 1(y){ λ 1 λde λ[c } 1. (4) 1xC tf 1 (y)] F amily 6: ξ(x, y, t) = x C y F 1 (t), a 1 (y, t) = ±, a 0 (y, t) = λ C, b (y, t) = C, b 1 (y, t) = C λ, b 0 (y, t) = 1, where, C are arbitrary constants, and F 1 (t) is an arbitrary function. Then we have ± λ u 8 (x, y, t) = 1 λde λ[xc yf 1 (t)] λ C, (4) λ v 8 (x, y, t) = C { 1 λde λ[xc yf 1 (t)] } λ C λ{ 1 λde λ[c } 1. (44) 1xC yf 1 (t)] Remark.. By the combination of Families -6 with Eqs. ()-(4), we also obtain some hyperbolic function solutions and trigonometric function solutions, which are omitted here. Remark.4. The established solutions Eqs. (1)-(46) for the (1)-dimensional dispersive long wave equations can not be obtained by the methods in [4-7], and are new exact solutions to our best knowledge. 4. Conclusions We have proposed a variable-coefficient Bernoulli equation-based sub-equation method method for solving nonlinear differential equations. Based on this method, abundant exact solutions have been obtained with the aid of Maple software for the (1)-dimensional breaking soliton equation and the (1)-dimensional dispersive long wave equations. As one can see, this method is concise, powerful, and can be applied to solve other nonlinear differential equations.

11 5. Acknowledgements Variable-coefficient Bernoulli Sub-equation Method 7 I would like to thank the anonymous referees for their useful and valuable suggestions. R E F E R E N C E S [1] M. Wang, Solitary wave solutions for variant Boussinesq equations, Phys. Lett. A, 199(1995), [] E.M.E. Zayed, H.A. Zedan and K.A. Gepreel, On the solitary wave solutions for nonlinear Hirota-Satsuma coupled KdV equations, Chaos, Solitons and Fractals, (004), [] M.A. Abdou, The extended tanh-method and its applications for solving nonlinear physical models, Appl. Math. Comput., 190(007), [4] E.G. Fan, Extended tanh-function method and its applications to nonlinear equations, Phys. Lett. A, 77(000), [5] W. Malfliet, Solitary wave solutions of nonlinear wave equations, Am. J. Phys., 60(199), [6] M.J. Ablowitz and P.A. Clarkson, Solitons, Nonlinear Evolution Equations and Inverse Scattering Transform, Cambridge University Press, Cambridge, [7] M.R. Miura, Backlund Transformation, Springer-Verlag, Berlin, [8] C. Rogers and W.F. Shadwick, Backlund Transformations, Academic Press, New York, 198. [9] R. Hirota, Exact envelope soliton solutions of a nonlinear wave equation, J. Math. Phys., 14(197), [10] R. Hirota and J. Satsuma, Soliton solution of a coupled KdV equation, Phys. Lett. A,85(1981), [11] L. Song and H.Q. Zhang, New exact solutions for the Konopelchenko-Dubrovsky equation using an extended Riccati equation rational expansion method and symbolic computation, Appl. Math. Comput., 187(007), [1] W.T. Li and H.Q. Zhang, Generalized multiple Riccati equations rational expansion method with symbolic computation to construct exact complexiton solutions of nonlinear partial differential equations, Appl. Math. Comput., 197(008), [1] S.K. Liu, Z.T. Fu, S.D. Liu and Q. Zhao, Jacobi elliptic function expansion method and periodic wave solutions of nonlinear wave equations, Phys. Lett. A, 89(001), [14] Z. Yan, Abundant families of Jacobi elliptic functions of the ( 1)-dimensional integrable Davey-Stawartson-type equation via a new method, Chaos, Solitons and Fractals, 18(00), [15] M.L. Wang and X.Z. Li, Applications of F-expansion to periodic wave solutions for a new Hamiltonian amplitude equation, Chaos, Solitons and Fractals, 4(005), [16] J. Biazar and Z. Ayati, Exp and modified Exp function methods for nonlinear Drinfeld-Sokolov system, J. King Saud Univer.-Sci., 4(01), [17] J.H. He and X.H. Wu, Exp-function method for nonlinear wave equations, Chaos, Solitons and Fractals, 0(006), [18] M.L. Wang, X.Z. Li and J.L. Zhang, The (G /G)-expansion method and travelling wave solutions of nonlinear evolution equations in mathematical physics, Phys. Lett. A, 7(008), [19] M.L. Wang, J.L. Zhang and X.Z. Li, Application of the (G /G)-expansion to travelling wave solutions of the Broer-Kaup and the approximate long water wave equations, Appl. Math. Comput., 06(008), 1-6.

12 74 Bin Zheng [0] Z. Xie and H.Q. Zhang, Symbolic computation and construction of soliton-like solutions for a (1)-dimensional breaking soliton equation, Appl. Math. Comput., 16(005), [1] S.H. Ma, J.P. Fang and C.L. Zheng, New exact solutions of the (1)-dimensional breaking soliton system via an extended mapping method, Chaos, Solitons and Fractals, 40(009), [] Z.Y Yan and H.Q. Zhang, Constructing Families of Soliton-Like Solutions to a (l)- Dimensional Breaking Soliton Equation Using Symbolic Computation, Comput. Math. Appl., 44(00), [] R. Radha, M. Lakshmanan, Singularity analysis and localized coherent structures in (1) dimensional generalized Korteweg-de Vries equations, J. Math. Phys., 5(1994), [4] C.C. Kong, D. Wang, L.N. Song and H.Q. Zhang, New exact solutions to MKDV-Burgers equation and (1)-dimensional dispersive long wave equation via extended Riccati equation method, Chaos, Solitons and Fractals, 9(009), [5] Z.Y. Yan, Generalized Transformations and Abundant New Families of Exact Solutions for (l)-dimensional Dispersive Long Wave Equations, Comput. Math. Appl., 46(00), [6] J.F. Zhang and P. Han, New multisoliton solutions of the (1)-dimensional dispersive long wave equations, Commun. Nonlinear Sci. Numer. Simul., 6(001), [7] M. Eslami, A. Neyrame and M. Ebrahimi, Explicit solutions of nonlinear (1)-dimensional dispersive long wave equation, J. King Saud Univer.-Sci., 4(01), [8] Y. Chen and Q. Wang, A new general algebraic method with symbolic computation to construct new doubly-periodic solutions of the (1)-dimensional dispersive long wave equation, Appl. Math. Comput., 167(005), [9] Q. Wang, Y. Chen and H.Q. Zhang, An extended Jacobi elliptic function rational expansion method and its application to (1)-dimensional dispersive long wave equation, Phys. Lett. A, 40(005), [0] Y. Chen and B. Li, Symbolic computation and construction of soliton-like solutions to the (1)-dimensional dispersive long-wave equations, Inter. J. Engin. Sci., 4(004), [1] N. Liu, X.Q. Liu and H.L. Lu, New exact solutions and conservation laws of the (1)- dimensional dispersive long wave equations, Phys. Lett. A, 7(009), [] S. Zhang, J.L. Tong and W. Wang, Exp-function method for a nonlinear ordinary differential equation and new exact solutions of the dispersive long wave equations, Comput. Math. Appl., 58(009), [] Y.Q. Zhou, Q. Liu, J. Zhang and W.N. Zhang, Exact solution for (1)-dimension nonlinear dispersive long wave equation, Appl. Math. Comput., 177(006), [4] E. Yomba, The modified extended Fan s sub-equation method and its application to (1)- dimensional dispersive long wave equation, Chaos, Solitons and Fractals, 6(005), [5] Y. Chen and Q. Wang, A series of new soliton-like solutions and double-like periodic solutions of a (1)-dimensional dispersive long wave equation, Chaos, Solitons and Fractals, (005), [6] X. Zeng and J. Zeng, Symbolic computation and new families of exact solutions to the (1)- dimensional dispersive long-wave equations, Chaos, Solitons and Fractals, 9(006), [7] S. Zhang, The periodic wave solutions for the (1)-dimensional dispersive long water equations, Chaos, Solitons and Fractals, (007),

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