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zbMath0497.35018MaRDI QIDQ3961840

Peter R. Popivanov

Publication date: 1981

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

zbMATH Keywords

symbol multiple characteristics hypoelliptic quasihomogeneous local nonsolvability

Mathematics Subject Classification ID

General theory of PDEs and systems of PDEs with constant coefficients (35E20) Geometric theory, characteristics, transformations in context of PDEs (35A30)

Related Items (2)

On a nonsolvable partial differential operator ⋮ A link between small divisors and smoothness of the solutions of a class of partial differential operators

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