作者pboywc (AC)
看板trans_math
标题Re: [微积]bounded & closed
时间Wed Sep 28 20:55:24 2005
※ 引述《Hirorio (重新开始)》之铭言:
: ※ [本文转录自 Math 看板]
: 作者: Hirorio (重新开始) 看板: Math
: 标题: [微积]bounded & closed
: 时间: Wed Sep 28 12:50:33 2005
: 感觉有点像 又好像不太一样
: 拜托罗 ^^
po一下def好了 应该会比较好懂
Def bounded
A sequence{An}is bounded from above if there exists a number M
s.t. An≦M for all n.The number M is an upper bound for{An}.
Def closed
A set α is a closed set if α 包含其所有 limit points
closed比较常用於高微描述set
bounded则是常用来描述sequence(set也有)
有错请指正
注:limit point定义是
A是一set,若对P的每一neighbourhood都包含有一异於P之A上的点,则P是A的limit point
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