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zbMATH Open0438.35069MaRDI QIDQ3879638

Petar Popivanov

Publication date: 1975

Title of this publication is not available (Why is that?)

zbMATH Keywords

pseudodifferential operators elliptic operators necessary and sufficient conditions local solvability characteristics sub-elliptic estimates

Mathematics Subject Classification ID

Pseudodifferential operators as generalizations of partial differential operators (35S05) Geometric theory, characteristics, transformations in context of PDEs (35A30) Elliptic equations and elliptic systems (35J99)

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