算子cosine函数族与二阶发展方程的初值问题

Operator Cosine Function Family and Insitial Value Problems of Second Order Evolution Equations

讨论了定度域在ＲＨｎ（）上的广义微分算子生成的正则算子ｃｏｓｉｎｅ函数，并将其结果应用于讨论发展方程。

Cosider the regular opertor cosine function family genorated be generalized differential operator,which are defined in H n(R) The result can be applied to the Cauchy problems of second order evolution prtial differential equations.