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Nonlinear self-adjointness through differential substitutions
DOI:10.1016/j.cnsns.2014.02.013.png)
摘要
En 中文
It is known (Ibragimov, 2011; Galiakberova and Ibragimov, 2013) [14,18] that the property of nonlinear self-adjointness allows to associate conservation laws of the equations under study, with their symmetries. In this paper we show that, even when the equation is nonlinearly self-adjoint with a non differential substitution, finding the explicit form of the differential substitution can provide new conservation laws associated to its symmetries. By using the general theorem on conservation laws (Ibragimov, 2007) [11] and the property of nonlinear self-adjointness we find some new conservation laws for the modified Harry-Dym equation. By using a differential substitution we construct a conservation law for the Harry-Dym equation, which has not been derived before using Ibragimov method. (C) 2014 Elsevier B.V. All rights reserved.
Keyword:
Self-adjointness
Quasi self-adjointness
Weak self-adjointness
Nonlinear self-adjointness
Symmetries
Partial differential equations
Conservation laws
期刊
IF:
3.8
论文数:
9.3K
被引数:
1.8W
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