摘 要: | Definition For a linear partial differential equation of hyperbolic type,when a set of Cauchy dataυ_1,υ_2,…,υ_n is given on a manifold,if the value of the solution of the Cauchy problem at any point P° bdepends on the valucs υ_(i1),υ(i2),… υ_(ik) only at points in a neighborhood of the intersection of bicharactertic curves passing through P°and the manifold,and if 0<κ
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