It is a partial differential equation satisfied by the electric field e.
这是一个，由电场e确定的偏微分方程。
In solving partial differential equation (i. e. pricing model), the author adopted the finite difference method to get its numerical solution.
本文采用有限差分法求解偏微分方程(即定价模型)的数值解。
A dynamic model of overhead cable for ropeway is developed, i. e. some differential equations of its vibration with initial and boundary conditions proved.
建立了架空索道在起动和制动时缆索的纵向运动微分方程，对其进行了数值求解。
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