Ring of sets

In mathematics, there are two different notions of a ring of sets, both referring to certain families of sets. In order theory, a nonempty family of sets $\mathcal{R}$ is called a ring (of sets) if it is closed under intersection and union. That is, the following two statements are true for all sets $A$ and $B$ ,

单词	Ring of sets
释义	Ring of sets 英语百科 Ring of sets In mathematics, there are two different notions of a ring of sets, both referring to certain families of sets. In order theory, a nonempty family of sets $\mathcal{R}$ is called a ring (of sets) if it is closed under intersection and union. That is, the following two statements are true for all sets $A$ and $B$ ,
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