推 jacky7987 :limit point:在metric sp下,x是一個limit point if 10/27 07:31
→ jacky7987 :for all r>0, B(x;r)交集該空間扣掉\{x}不是空集合 10/27 07:32
→ jacky7987 :跟closed set的關係是:如果F is closed iff 10/27 07:32
→ jacky7987 :F contains all its limit point i.e. 10/27 07:33
→ jacky7987 :F'包含在F, F' is the set of all limit point, 10/27 07:33
→ playmypig :是這樣啊, 因為還是大一生,是初學分析的說,那對於數 10/27 23:04
→ playmypig :列來說,是怎樣呢? 10/27 23:05