The equivalence relation on a finite set is an important relation, which relates to the partition on the set.
有限集上等价关系是一个重要的关系，它同集合的划分有着密切的联系。
Generally speaking, there are few profound discussion and research on the partition and covering of finite set.
关于有限集合上的划分与覆盖，一般很少讨论和研究。
The equation is discretized by discontinuous Galerkin finite element method, that is approximating functions being discontinuous at the nodes of partition in time.
利用间断时空有限元方法对方程进行离散，即允许近似函数在时间节点处是间断的。
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