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Closure of union and union of closures

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发表于 2010-10-3 01:23 | 显示全部楼层 |阅读模式

I know how to do (a) and (b), have trouble with the infinite.

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发表于 2010-10-3 02:20 | 显示全部楼层

Closure of union and union of closures

cl({1/n})

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 楼主| 发表于 2010-10-3 02:27 | 显示全部楼层

Closure of union and union of closures

I see. New limit points appear when n tends to infinity.
发表于 2010-10-7 16:36 | 显示全部楼层

Closure of union and union of closures

外文帖子,别往下掉,,,
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