新GRE数学要点
IntersectionofSets
Intersectionoftwosetsisanothersetwithonlythemembersthatareinbothsets. Ifthetwosetsdonotshareanycommonmember， theintersectionistheemptysetwithnomember.
Example：
Intersectionof {1，2，3} and {2，3，5} istheset {2，3}。
Intersectionofthesetwithallprimesandthesetwithallevennumbersistheset {2} sinceonly 2 isbothevenandprime.
Intersectionof {1，2，3} and {4，5，6} istheemptyset {}。
Remember：
Intersectioncontainsonlythecommonmembers.
Twosetsaredisjointiftheyhavenomemberincommon， thatistheyhaveanemptyintersection.
UnionofSets
Unionoftwosetsisanothersetwithallthemembersfrombothsets.
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