如果一个无限集中的元素可以按某种规律排成一个序列，或者说，可以对这个集合的元素标号表示为 {a1,a2,a3, ... ,an, ...}, 则称其为可列集。
可得当位置集为可列集且每次转移多个粒子时，耦合随机徘徊过程是存在的且为一无穷质点马氏过程。
The main methods to achieve this is the transition from a finite set to infinite set and the coupling of stochastic processes.
可连续扩张到边界的连续映射在列紧集上具有若干与紧集上相同的性质。
A continuous mapping on a sequential compact set that can be continuously extended to the boundary has the same properties as on a compact set.
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