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zbMath0558.35082MaRDI QIDQ3223291

Chavdar Georgiev, Peter R. Popivanov

Publication date: 1984

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

a priori estimate double characteristics nonsolvability microlocal nonsolvability nonhypoellipticity principal type operator

Mathematics Subject Classification ID

Pseudodifferential operators as generalizations of partial differential operators (35S05) A priori estimates in context of PDEs (35B45) Geometric theory, characteristics, transformations in context of PDEs (35A30)

Related Items (1)

Microlocal Solvability and Subellipticity of Several Classes of Pseudodifferential Operators with Involutive Characteristics

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