Remarks on hyperbolic polynomials
Remarks on hyperbolic polynomials
In the study of hyperbolic partial differential operators, it is important to in- vestigate properties of the characteristic roots.Bronshtein [2] proved the Lipschitz continuity of the characteristic roots of hyperbolic operators with variable coeffi- cients, and he studied the hyperbolic Cauchy problem in Gevrey classes (see [3]).Ohya and Tarama [7] …