Corner Mellin operators and reduction of orders with parameters
B. W. Schulze (1989)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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B. W. Schulze (1989)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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C. Parenti, L. Rodino (1983)
Banach Center Publications
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J. J. Duistermaat (1971-1972)
Séminaire Équations aux dérivées partielles (Polytechnique)
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Nazaikinskii, V.E., Sternin, B.Yu. (2006)
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Lars Hörmander (1961)
Annales de l'institut Fourier
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On donne une condition suffisante pour l’hypoellipticité d’une équation différentielle à coefficients variables. La démonstration utilise une paramétrix construite par transformation de Fourier.
Richard Beals (1979)
Annales de l'institut Fourier
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Continuity in spaces and spaces of Hölder type is proved for pseudodifferential operators of order zero, under general conditions on the class of symbols. Applications to the regularity theory of some hypoelliptic operators are outlined.
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Electronic Journal of Differential Equations (EJDE) [electronic only]
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Todor V. Gramchev (1987)
Banach Center Publications
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Rodino, Luigi, De Donno, Giuseppe (2000)
Rendiconti del Seminario Matematico
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