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• W1533830901 abstract "AbstractThis paper studies the solvability for square systems of classical pseudodifferential operators. We assume that the system is of principal type, i.e., the principal symbol vanishes of first order on the kernel. We shall also assume that the eigenvalues of the principal symbol close to zero have constant multiplicity. We prove that local solvability for the system is equivalent to condition (ψ) on the eigenvalues of the principal symbol. This condition rules out any sign changes from - to + of the imaginary part of the eigenvalue when going in the positive direction on the bicharacteristics of the real part. Thus we need no conditions on the lower order terms.We obtain local solvability by proving a localizable a priori estimate for the adjoint operator with a loss of 3/2 derivatives (compared with the elliptic case).KeywordsSolvabilitypseudodifferential operatorprincipal typesystems of differential equations" @default.
• W1533830901 created "2016-06-24" @default.
• W1533830901 creator A5047925516 @default.
• W1533830901 date "2011-01-01" @default.
• W1533830901 modified "2023-09-25" @default.
• W1533830901 title "On the solvability of systems of pseudodifferential operators" @default.
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• W1533830901 doi "https://doi.org/10.1007/978-0-8176-8244-6_5" @default.
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