On the Regularity of the Riemann Function for Hyperbolic Equations
Open Access
- 1 January 1973
- journal article
- Published by JSTOR in Transactions of the American Mathematical Society
- Vol. 175, 483-490
- https://doi.org/10.2307/1996090
Abstract
In an earlier paper, A. Friedman demonstrated that the Riemann function for a strictly hyperbolic system with Gevrey coefficients was locally Gevrey of some higher order except along the bicharacteristics. By representing the Riemann function in terms of a progressing wave expansion, this result is extended beyond caustics.Keywords
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