GRE數學考點：交集和并集。 新GRE數學相當于中國高中數學的水平，對考生來說沒有太大的問題，不過，考生依然要認真對待，以免造成不必要的失分。 下面是天道小編為同學們搜索整理的有關GRE數學考點：交集和并集的介紹。希望對同學們的gre 考試有所幫助，下面和小編一起來看看吧：
　　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.