New conservation laws of some third-order systems of pdes arising from higher-order multipliers

被引:3
|
作者
Morris, R.
Kara, A. H. [1 ]
机构
[1] Univ Witwatersrand, Sch Math, ZA-2050 Wits, South Africa
关键词
Higher-order conservation laws; Third-order systems of pdes; PARTIAL LAGRANGIANS; SYMMETRIES;
D O I
10.1016/j.amc.2010.08.002
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In this paper, we study conservation laws for some third-order systems of pdes, viz., some versions of the Boussinesq equations and the BBM equation. It is shown that new and interesting conserved quantities arise from 'multipliers' that are of order greater than one in derivatives of the dependent variables. Furthermore, the invariance properties of the conserved flows with respect to the Lie point symmetry generators are investigated via the symmetry action on the multipliers. (C) 2010 Elsevier Inc. All rights reserved.
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页码:2639 / 2643
页数:5
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