数学吧 关注:940,705贴子:9,435,025
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拓扑学 证明题啊,会的童鞋求教啊!谢谢!!

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Let X = Z(有理数) and let O be the collections of all sets that contain 0,
together with the empty set.
Show that (X;O) is a topology. 求证明!!!!
谢谢啊谢谢啊谢谢啊-0-。


1楼2012-07-04 17:45回复