New classes of nonlinearly self-adjoint evolution equations of third- and fifth-order
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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Cite
@article{arxiv.1202.3955,
title = {New classes of nonlinearly self-adjoint evolution equations of third- and fifth-order},
author = {Igor Leite Freire},
journal= {arXiv preprint arXiv:1202.3955},
year = {2018}
}