Abstract
We present a new Bäcklund-type transformation for the nonlinear equation\(\vartheta _{xy} = 2\sqrt {\lambda \left( {x,y} \right)\vartheta _x \vartheta _y } \) studied by É. Goursat. Goursat found a linearization transformation and some properties of this equation, which make it similar to the Moutard equation uxy=M(x, y)u. However, this Goursat transformation does not provide proper superposition formulas. We give the necessary extended superposition formulas.
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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 122, No. 1, pp. 50–57, January, 1999.
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Ganzha, E.I. An analogue of the Moutard transformation for the Goursat equation\(\vartheta _{xy} = 2\sqrt {\lambda \left( {x,y} \right)\vartheta _x \vartheta _y } \) . Theor Math Phys 122, 39–45 (2000). https://doi.org/10.1007/BF02551168
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DOI: https://doi.org/10.1007/BF02551168