Abstract
We perform complete group classification of the general class of quasi linear wave equations in two variables. This class may be seen as a broad generalization of the nonlinear d'Alembert, Liouville, sin/sinh-Gordon and Tzitzeica equations. In this way we derived a number of new genuinely nonlinear invariant models with high symmetry properties. In particular, we obtain four classes of nonlinear wave equations admitting five-dimensional invariance groups. Applying the symmetry reduction technique we construct multi-parameter families of exact solutions of these equations.
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Lahno, V., Zhdanov, R. & Magda, O. Group Classification and Exact Solutions of Nonlinear Wave Equations. Acta Appl Math 91, 253–313 (2006). https://doi.org/10.1007/s10440-006-9039-0
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DOI: https://doi.org/10.1007/s10440-006-9039-0