Abstract
Under investigation in this paper are the Belov–Chaltikian (BC), Leznov and Blaszak–Marciniak (BM) lattice equations, which are associated with the conformal field theory, UToda\((m_1,m_2)\) system and r-matrix, respectively. With symbolic computation, the Bell-polynomial approach is developed to directly bilinearize those three sets of differential–difference nonlinear evolution equations (NLEEs). This Bell-polynomial approach does not rely on any dependent variable transformation, which constitutes the key step and main difficulty of the Hirota bilinear method, and thus has the advantage in the bilinearization of the differential–difference NLEEs. Based on the bilinear forms obtained, the N-soliton solutions are constructed in terms of the \(N \times N\) Wronskian determinant. Graphic illustrations demonstrate that those solutions, more general than the existing results, permit some new properties, such as the solitonic propagation and interactions for the BC lattice equations, and the nonnegative dark solitons for the BM lattice equations.
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Qin, B., Tian, B., Wang, YF. et al. Bell-polynomial approach and Wronskian determinant solutions for three sets of differential–difference nonlinear evolution equations with symbolic computation. Z. Angew. Math. Phys. 68, 111 (2017). https://doi.org/10.1007/s00033-017-0853-1
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DOI: https://doi.org/10.1007/s00033-017-0853-1