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zbMath0437.35024MaRDI QIDQ3878046

Peter R. Popivanov, Georgi S. Popov

Publication date: 1980

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

zbMATH Keywords

a priori estimates pseudo-differential operators multiple characteristics principal symbol subprincipal symbol microlocal hypoellipticity algebraic characterisation

Mathematics Subject Classification ID

Pseudodifferential operators as generalizations of partial differential operators (35S05) A priori estimates in context of PDEs (35B45) Hypoelliptic equations (35H10) Pseudodifferential operators and other generalizations of partial differential operators (35S99)

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