GRE數(shù)學(xué)考點(diǎn)之Set和交并集

交集和并集
　　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.
　　以上是新GRE數(shù)學(xué)備考中關(guān)于交集和并集的內(nèi)容，大家在備考的時(shí)候不妨分考點(diǎn)來復(fù)習(xí)，將做錯(cuò)的題整理出來，考前一個(gè)星期內(nèi)集中再過一遍。
　　新GRE數(shù)學(xué)考點(diǎn)：Set
　　A set is a collection of objects or things. Each object in a set a member or element of that set.Size of a set is the number of members in the set.
　　Example:
　　The set of even numbers between 2 and 10 is of size 5:{2,4,6,8,10}.
　　The set of primes between 2 and 10 is of size 4:{2,3,5,7}.
　　Remember:
　　Each member of set A belongs to A or is in the set A.
　　A set can not have repeating member:{1,3,1,2}is not a set.
　　Rearranging the order of the members does not change the set:{1,2,3}is same as{3,2,1}.