摘要: Chap 1 Point Set Topology Lec1 Def: \(T\) topology of X if: (1) \(\empty, X\in T\) (2) ( union of elts in \(T\)) \(\in T\) (3) \(a, b\in T\), then \(a 阅读全文
posted @ 2021-09-21 10:59 CauchySheep 阅读(557) 评论(0) 推荐(0) 编辑