推 jacky7987 :第一個是邊界嗎? 03/10 22:23
→ NTUEEboy :YES 03/10 23:31
推 czk0622 :要先知道S的Topological Space才能討論 closed吧 03/12 16:11
→ xcycl :這幾題根據定義就出來了吧 ... 03/13 02:55
Let S be an arbitary set. prove
(a) δS is closed
(b) S^0 is open
(c) The exterior of S is open
(d) The limit points of S form a closed set
(e) ═ ─
S = S
以上幾題希望有大大可以幫我解答一下
拜託 謝謝喔
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