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Uniqueness of solutions of partial differential equations when the initial surface is characteristic at a point

Author: Letitia J. Korbly
Journal: Proc. Amer. Math. Soc. 86 (1982), 617-624
MSC: Primary 35L15
MathSciNet review: 674093
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Abstract: Uniqueness in the Cauchy problem for hyperbolic operators degenerate at a point on the initial surface depends on values of the coefficients of the lower order terms. If the operator $ P$ is doubly characteristic at the origin with respect to the $ t = 0$ line, $ P$ has uniqueness for functions which are smooth enough if the coefficient of the $ {D_t}$ term does not lie in a certain discrete set of numbers.

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Keywords: Hyperbolic PDE, Cauchy problem, doubly characteristic
Article copyright: © Copyright 1982 American Mathematical Society

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