Classification of classical and non-local symmetries of fourth-order nonlinear evolution equations

Details Classification of classical and non-local symmetries of fourth-order nonlinear evolution equations Classification of classical and non-local symmetries of fourth-order nonlinear evolution equations

2009-05-13

arxiv.org/abs/0905.2033v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

LaTeX, 60 pages

Scientific paper

In this paper, we consider group classification of local and quasi-local symmetries for a general fourth-order evolution equations in one spatial variable. Following the approach developed by Zhdanov and Lahno, we construct all inequivalent evolution equations belonging to the class under study which admit either semi-simple Lie groups or solvable Lie groups. The obtained lists of invariant equations (up to a local change of variables) contain both the well-known equations and a variety of new ones possessing rich symmetry. Based on the results on the group classification for local symmetries, the group classification for quasi-local symmetries of the equations is also given.

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