The model is a free boundary problem for a system of partial differential equations.
该模型是一个偏微分方程系统的自由边界问题。
The kinematics of free electrons is described by the free Dirac equation, a four-dimensional system of partial differential equations.
自由电子的运动学由自由狄拉克方程——一个四维系统的偏微微分方程描述。
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。
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