In this paper,the direct symmetry method is extended to the Lax pair of the ANNV equation.As a result,symmetries of the Lax pair and the ANNV equation are obtained at the same time.Applying the obtained symmetry,the (...In this paper,the direct symmetry method is extended to the Lax pair of the ANNV equation.As a result,symmetries of the Lax pair and the ANNV equation are obtained at the same time.Applying the obtained symmetry,the (2+1)-dimensionai Lax pair is reduced to (1+1)-dimensional Lax pair,whose compatibility yields the reduction ofthe ANNV equation.Based on the obtained reductions of the ANNV equation,a lot of new exact solutions for theANNV equation are found.This shows that for an integrable system,both the symmetry and the reductions can beobtained through its corresponding Lax pair.展开更多
In this paper, the complex short pulse equation and the coupled complex short pulse equations that can describe the ultra-short pulse propagation in optical fibers are investigated. The two complex nonlinear models ar...In this paper, the complex short pulse equation and the coupled complex short pulse equations that can describe the ultra-short pulse propagation in optical fibers are investigated. The two complex nonlinear models are turned into multi-component real models by proper transformations. Lie symmetries are obtained via the classical Lie group method, and the results for the coupled complex short pulse equations contain the existing results as particular cases.Based on the linearizing operator and adjoint linearizing operator for the two real systems,adjoint symmetries can be obtained. Explicit conservation laws are constructed using the symmetry/adjoint symmetry pair(SA) method. Relationships between the nonlinear selfadjointness method and the SA method are investigated.展开更多
基金Natural Science Foundation of Shandong Province under Grant Nos.2004zx16 and Q2005A01
文摘In this paper,the direct symmetry method is extended to the Lax pair of the ANNV equation.As a result,symmetries of the Lax pair and the ANNV equation are obtained at the same time.Applying the obtained symmetry,the (2+1)-dimensionai Lax pair is reduced to (1+1)-dimensional Lax pair,whose compatibility yields the reduction ofthe ANNV equation.Based on the obtained reductions of the ANNV equation,a lot of new exact solutions for theANNV equation are found.This shows that for an integrable system,both the symmetry and the reductions can beobtained through its corresponding Lax pair.
基金funded by the National Natural Science Foundation of China(No.12105073)Science and Technology Program of Colleges and Universities in Hebei Province(No.QN2020144)+2 种基金Science and Technology Plan Project(Special Program for Soft Science)in Hebei Province(No.20556201D)Scientific Research and Development Program Fund Project of Hebei University of Economics and Business(Nos.2020YB15,2020YB12 and 2021ZD07)Youth Team Support Program of Hebei University of Economics and Business。
文摘In this paper, the complex short pulse equation and the coupled complex short pulse equations that can describe the ultra-short pulse propagation in optical fibers are investigated. The two complex nonlinear models are turned into multi-component real models by proper transformations. Lie symmetries are obtained via the classical Lie group method, and the results for the coupled complex short pulse equations contain the existing results as particular cases.Based on the linearizing operator and adjoint linearizing operator for the two real systems,adjoint symmetries can be obtained. Explicit conservation laws are constructed using the symmetry/adjoint symmetry pair(SA) method. Relationships between the nonlinear selfadjointness method and the SA method are investigated.