作者TibetFreedom (西藏自由加油!达赖加油!!)
看板Grad-ProbAsk
标题[理工] [微积] open subset closed subset 的问题
时间Tue Nov 3 19:41:45 2009
Let f be a real continuous function on a metric space S.
Let P(f)={s属於S ▎f(s)＞0}
Is P(f) a closed subset,open subset,or neither？
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