Topology space

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\(\underline{Def:}\)A topology space
\(X=(\underline{X},\eth_{x})\)consists of a set \(\underline{X}\),called the underlying space of \(X\) ,and a family \(\eth_{x}\)of subsets of \(X\)(ie.\(\eth_{x}\subset P(\underline{X})\))

Topology space

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原文地址：https://www.cnblogs.com/zonghanli/p/12232602.html