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空集是任何集合的真子集,你的那個說法是不正確的,比如一個集合是{0、2、5、8},那麼空集(這個符號我打不出來)、{2}、{2,5,8}、{0}都是集合{0、2、5、8}的真子集.一個集合的真子集就是不包含這個集合的全部元素的任意一個集合(包括空集),這樣解釋你應該懂了吧!
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