比式判别法和根式判别法是对正项级数收敛性进行判别的两种广用的方法。
The ratio test and the root test are two widely used convergence tests for positive series.
无穷级数的收敛性与发散性与此概念有关。
Convergence and divergence of infinite series depend upon this concept.
要准确计及电子相关效应，还需通过作更高阶展开，以考察级数的收敛性。
To estimate more accurately the electron correlation effects, one has to calculate to higher orders and check he convergency of the series.
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