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A=B,they are not two sets...No definion,no right

jinjing 2010-07-24 11:06:23 ( reads)

or wrong.You are right,though I also is right.Complementary set is very important for a set.

跟帖(2)

皆兄弟也

2010-07-24 11:37:48

A=B,they are semantically not two sets, but symbolically two set

皆兄弟也

2010-07-24 11:59:45

A和B指同一个集合，如果A=B；A和B指不同集合，如果A!=B。但A和B是不同符号。