Cherniha, Roman; Myroniuk, Liliia Lie symmetries and exact solutions of a class of thin film equations. (English) Zbl 1264.74156 J. Phys. Math. 2, Article ID P100508, 19 p. (2010). Summary: A symmetry group classification for fourth-order reaction-diffusion equations, allowing for both second-order and fourth-order diffusion terms, is carried out. The fourth-order equations are treated, firstly, as systems of second-order equations that bear some resemblance to systems of coupled reaction-diffusion equations with cross diffusion, secondly, as systems of a second-order equation and two first-order equations. The paper generalizes the results of Lie symmetry analysis derived earlier for particular cases of these equations. Various exact solutions are constructed using Lie symmetry reductions of the reaction-diffusion systems to ordinary differential equations. The solutions include some unusual structures as well as the familiar types that regularly occur in symmetry reductions, namely, self-similar solutions, decelerating and decaying traveling waves, and steady states. Cited in 6 Documents MSC: 74K35 Thin films 35K99 Parabolic equations and parabolic systems 35K60 Nonlinear initial, boundary and initial-boundary value problems for linear parabolic equations Software:DESOLV PDF BibTeX XML Cite \textit{R. Cherniha} and \textit{L. Myroniuk}, J. Phys. Math. 2, Article ID P100508, 19 p. (2010; Zbl 1264.74156) Full Text: DOI arXiv OpenURL