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.
初中英语常用词组2 介词短语词组
09年中考英语总复习经典习题讲解5一代词
常用英语词语辨析105组(2)
词汇笔记 五种词汇的学习方法 超强
09年中考英语总复习经典习题讲解3一冠词
2009中考英语词汇短语集锦 (1)
2009中考英语词汇表 系列W
2010年中考英语词汇熟词新义:start
2009最新中考英语单项填空模拟考试卷 附详解答案
初中英语常用词组复习2
初中英语短语汇总 A- Y
2009中考英语词汇表 系列H
2009中考英语词汇表 系列JKL
中考英语词汇“for短语”全攻略
2009中考英语词汇表 系列S
常用英语词语辨析105组(5)
十个窍门积累英语词汇
2010年中考英语词汇旧词新义:deal
2010年中考英语词汇旧词新义:cost
09年英语短语集中联想记忆110条
初中英语 词缀记忆法
2009中考英语词汇表 系列PQ
高中英语词汇:80后“A到Z”生存法则
初中英语常用词组1 动词词组
为英语写作”画龙点睛“的24句谚语
常用英语词语辨析105组(11)
2010年中考英语词汇旧词新义:clean
常用英语词语辨析105组(3)
2009中考英语词汇表 系列R
2009中考英语词汇表 系列M
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |