...特征超曲面及次特征线双曲型方程柯西问题混杂初-边值问题 定义 双曲型偏微分方程（Hyperbolic partial differential equations）：描写振动或波动现象的偏微分方程。它的一个典型特例是波动方程和n=1时的波动方程。
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hyperbolic partial functional differential equations 双曲偏泛函微分方程
The underlying method is based on the simple wave solutions of a system of hyperbolic partial differential equations.
基本的方法是以双曲型偏微分方程组的简单波解为根据的。
The underlying method is based on the simple wave solutions of a system of hyperbolic partial differential equations.
复杂介质中地震波的传播多是通过求取单程或双程波动方程的数值解进行模拟的。
This model consists the hyperbolic partial differential equations, boundary conditions and cyclical conditions of the system.
该模型由描述系统振动的双曲型偏微分方程组及相应的边界条件和周期性条件组成。
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