countable set

• 可数集

countable set的用法和样例：

例句

1. The results show that the eigenvalues of the boundary-value problem form a denumerable set, and the eigenvalue approaches infinity.
   结果表明边值问题的特征值构成一个可数集，并且特征值趋向于无穷大。
2. There is no requirement that this set of columns is a minimal set of columns.
   不要求此列集是最小列集。