Abstract
We determine conditions under which partial differential equations are reducible to equations with a smaller number of independent variables and show that these conditions are necessary and sufficient in the case of a single dependent variable.
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Zhdanov, R.Z., Tsifra, I.M. Reduction of differential equations and conditional symmetry. Ukr Math J 48, 661–670 (1996). https://doi.org/10.1007/BF02384233
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DOI: https://doi.org/10.1007/BF02384233