[分析] 關於函數極限的ㄧ個小定理
有個定理是這樣的~
f:A -> T
假設p是accumulation point of A 且 b屬於T
(a)lim x→p f(x) = b
if and only if
(b)lim n→∞ f(Xn) = b for every sequence {Xn} of points in A-{p} which converges to p
我的問題是
(b) implies (a)
所以如果(a)不成立那(b)就不成立
所以如果lim x→p f(x) ≠ b 那 請問是(1) 存在sequence {Xn} of points in A-{p} which converges to p 使得lim n→∞ f(Xn) ≠ b
還是(2)for every sequence {Xn} of points in A-{p} which converges to p 使得lim n→∞ f(Xn) ≠ b
按照我看的書上證明應該是(1)不過我覺得(2)好像也滿合理的XD
煩請各位高手幫我解答> <
感謝~^^
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