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Non-Lie symmetry groups of \((2+1)\)-dimensional nonlinear systems obtained from a simple direct method. (English) Zbl 1069.37048

MSC:
37K05 Hamiltonian structures, symmetries, variational principles, conservation laws (MSC2010)
17B99 Lie algebras and Lie superalgebras
35A30 Geometric theory, characteristics, transformations in context of PDEs
35Q53 KdV equations (Korteweg-de Vries equations)
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