On some classes of non-hypoelliptic second order partial differential operators

zbMath0665.35019MaRDI QIDQ1116017

Toyohiro Akamatsu

Publication date: 1988

Published in: Osaka Journal of Mathematics (Search for Journal in Brave)

zbMATH Keywords

second orderglobally hypoellipticnon-hypoellipticity

Mathematics Subject Classification ID

Hypoelliptic equations (35H10) Linear higher-order PDEs (35G05)

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