讨论了计算二维静电场的非正交有限差分算法，给出了数值计算公式。
A finite difference method in non orthogonal curvilinear coordinate is used for the simulation of two dimensional electrostatic field. The computational formula is derived.
本文采用有限差分法进行分析，提出了闭式导轨的设计计算公式。
Finite difference method is applied, giving formula for the design of close-type air-lubricated guide-ways.
根据拓扑熵的定义公式，用逆像点个数的方法找到了有限长度超稳揉序列词的拓扑熵的差分关系式。 该函数关系式直接依赖于揉序列词。
According to the definition of topological entropy, a new method of calculating topological entropy is found, which directly depends on the kneading sequence or word.
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