
Accession Number : AD0693628
Title : ASYMPTOTIC GEVREY CLASSES AND THE CAUCHY PROBLEM FOR NONSTRICTLY HYPERBOLIC LINEAR DIFFERENTIAL EQUATIONS.
Descriptive Note : Doctoral thesis,
Corporate Author : INDIANA UNIV BLOOMINGTON DEPT OF MATHEMATICS
Personal Author(s) : Newberger,Edward
Report Date : SEP 1969
Pagination or Media Count : 70
Abstract : The notion of asymptotic Gevrey classes alpha, alpha > 1 is introduced. These classes are related to but distinct from the Gevrey classes used by J. Leray and Y. Ohya in connection with the Cauchy problem for a nonstrictly hyperbolic equation defined on a strip X in R sub (l+1), l = or > 1. A characterization of an asymptotic Gevrey class alpha is given in terms of conditions on the determining sequence of the class. To this end, the work of S. Mandelbrojt on classes of infinitely differentiable functions is extended to strips X and to the norms associated with these strips. Asymptotic Gevrey classes are then applied to a study of the Cauchy problem for a nonstrictly hyperbolic linear differential equation on X. It is proved that if the coefficients of the differential operator, the nonhomogeneous term, and the Cauchy data belong to certain asymptotic Gevrey classes alpha, then a solution exists on X which belongs to an appropriate Gevrey class alpha. (Author)
Descriptors : (*PARTIAL DIFFERENTIAL EQUATIONS, *CAUCHY PROBLEM), SEQUENCES(MATHEMATICS), INEQUALITIES, THEOREMS, THESES
Subject Categories : Theoretical Mathematics
Distribution Statement : APPROVED FOR PUBLIC RELEASE