Sigma-ring
（重定向自Sigma ring）
In mathematics, a nonempty collection of sets is called a σ-ring (pronounced sigma-ring) if it is closed under countable union and relative complementation.
| 单词 | Sigma ring |
| 释义 |
Sigma ring
英语百科
Sigma-ring（重定向自Sigma ring）
In mathematics, a nonempty collection of sets is called a σ-ring (pronounced sigma-ring) if it is closed under countable union and relative complementation. |
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