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Multivalued solutions and a principle of classification of nonlinear differential equations. (English. Russian original) Zbl 0306.35003
Sov. Math., Dokl. 14, 661-665 (1973); translation from Dokl. Akad. Nauk SSSR 210, 11-14 (1973).

MSC:
 35A30 Geometric theory, characteristics, transformations in context of PDEs 35G20 Nonlinear higher-order PDEs 35N15 $$\overline\partial$$-Neumann problems and formal complexes in context of PDEs 58J99 Partial differential equations on manifolds; differential operators 58A20 Jets in global analysis