An invariant measuring the irregularity of a differential operator and a microdifferential operator

zbMath0451.35006MaRDI QIDQ1147885

Takashi Aoki

Publication date: 1982

Published in: Journal de Mathématiques Pures et Appliquées. Neuvième Série (Search for Journal in Brave)

zbMATH Keywords

irregularitydifferential operatorcharacteristic varietymicrodifferential operatorDe Paris decompositionDe Paris functionGerard- Levelt invariantsKomatsu irregularity

Mathematics Subject Classification ID

Pseudodifferential operators as generalizations of partial differential operators (35S05) Analyticity in context of PDEs (35A20) Ordinary differential equations in the complex domain (34M99) Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions) (35R20) Integral, integro-differential, and pseudodifferential operators (47Gxx)

Related Items (1)

Microlocal analysis of partial differential operators with irregular singularities

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