集合数学知识点交集:GRE数学重要知识点：交集并集

【#GRE# 导语】宝剑锋从磨砺出，梅花香自苦寒来。坚持备考的人生，很积极，很宝贵，很励志。冲吧，努力吧！以下为©文档大全网整理的“GRE数学重要知识点：交集并集”，欢迎阅读参考！更多相关讯息请关注©文档大全网！

　　Intersection of Sets

　　Intersection of two sets is another set with only the members that are in both sets. If the two sets do not share any common member, the intersection is the empty set with no member.

　　Example:

　　Intersection of {1,2,3} and {2,3,5} is the set {2,3}.

　　Intersection of the set with all primes and the set with all even numbers is the set {2} since only 2 is both even and prime.

　　Intersection of {1,2,3} and {4,5,6} is the empty set {}.

　　Remember:

　　Intersection contains only the common members.

　　Two sets are disjoint if they have no member in common, that is they have an empty intersection.

　　Union of Sets

　　Union of two sets is another set with all the members from both sets.

　　Example

　　Union of {2,3,5} and {1,3,4} is the set {1,2,3,4,5}.

　　Union of {1,2,1} and {1,2} is the set {1,2,1}.

　　Remember:

　　The common members do not repeat in the union.

本文来源：https://www.wddqw.com/KQfZ.html