新GRE数学考点：并集和交集.

　　今天针对新gre数学复习，小编给大家整理的是关于Set的相关内容，这些概念在考试中一定会考到的。希望考生能再接再厉，取得一个好成绩，突破新gre数学难的困境。

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　　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.

　　俗话说：“工欲善其事必先利其器”。有一部分考生认为新GRE数学具有一定的难度，这其中的原因是由于考生在复习时没有把新gre数学的基础打牢。想要新gre数学考好，复习的时候一定要把基本概念和重要考点都弄扎实。