新GRE数学要点:Set

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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.
- d% a4 M! |+ B( {8 }+ p, P　　Example:
/ Y* h  k$ {& N4 r　　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}.
' Q9 i( y. D, O' G2 R　　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}.