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arXiv · 1202.3955

New classes of nonlinearly self-adjoint evolution equations of third- and fifth-order

Igor Leite Freire
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Abstract

In a recent communication Nail Ibragimov introduced the concept of nonlinearly self-adjoint differential equation [N. H. Ibragimov, Nonlinear self-adjointness and conservation laws, J. Phys. A: Math. Theor., vol. 44, 432002, 8 pp., (2011)]. In the present communication a nonlinear self-adjoint classification of a general class of fifth-order evolution equation with time dependent coefficients is presented. As a result five subclasses of nonlinearly self-adjoint equations of fifth-order and four subclasses of nonlinearly self-adjoint equations of third-order are obtained. From the Ibragimov's theorem on conservation laws [N. H. Ibragimov, A new conservation theorem, J. Math. Anal. Appl., vol. 333, 311--328, (2007)] conservation laws for some of these equations are established.

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Igor Leite Freire. 2012-02-17. New classes of nonlinearly self-adjoint evolution equations of third- and fifth-order. https://doi.org/10.1016/j.cnsns.2012.08.022

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