Abstract
We present a complete list of nonlinear one-field hyperbolic equations with integrable third-order x and y symmetries. The list includes both equations of the sine-Gordon type and equations linearizable by differential substitutions.
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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 166, No. 1, pp. 51–67, January, 2011.
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Meshkov, A.G., Sokolov, V.V. Hyperbolic equations with third-order symmetries. Theor Math Phys 166, 43–57 (2011). https://doi.org/10.1007/s11232-011-0004-3
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DOI: https://doi.org/10.1007/s11232-011-0004-3