→ Xixan :右到左應該有反例 12/05 11:05
→ Xixan :因為凝聚點 =/= 有 conv. seq. 收斂到它 12/05 11:06
請問各位先進一個問題
If (X, T) is a topological space,
A is closed iff every conv. seq. in A converges to a point in A.
由左到右我有寫出來, 但是由右到左我被卡住了
還是說這個命題只有單邊的(左到右)
求教了!謝謝^^
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