Propagation of singularities for operators with constant coefficient hyperbolic-elliptic principal part |
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Authors: | M Cicognani A Corli |
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Institution: | (1) Present address: Istituto di Matematica, P. zza di Porta S. Donato 5, Bologna;(2) Present address: Istituto di Matematica, Via Machiavelli 35, Ferrara |
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Abstract: | Summary In this paper we consider partial differential operators of the type P(x, D)= Pm(D)+Q(x, D), where the constant coefficient principal part Pm is supposed to be hyperbolic-elliptic. We study the propagation of Gevrey singularities for solutions u of the equation P(x, D) u=f, for ultradistributions f, finding exactly to which spaces of ultradistribuiions u microlocally belongs. The results are obtained by constructing a fundamental solution for P when the lower order part Q is with constant coefficients, and a parametrix otherwise. |
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