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基础数学 今日: 10 |主题: 32990|排名: 2 

版主: luyuanhong
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预览 R and the empty set are the only open and closed sets. attachment  ...2 kindlychung 2010-9-30 13:00 107154 wangyangkee 2010-10-7 16:38
预览 Isn';t this definition of closed sets flawed? attachment kindlychung 2010-10-1 23:42 54329 wangyangkee 2010-10-7 16:38
预览 Open cover, finite subcover attachment kindlychung 2010-10-2 15:53 15244 wangyangkee 2010-10-7 16:37
预览 \sum{min{a_n, b_n}} converges, while \sum{a_n} and attachment  ...23 kindlychung 2010-9-28 13:46 239906 wangyangkee 2010-10-7 16:37
预览 Closure of union and union of closures attachment kindlychung 2010-10-3 01:23 34002 wangyangkee 2010-10-7 16:36
预览 finite, compact attachment kindlychung 2010-10-2 17:25 23555 wangyangkee 2010-10-7 16:35
预览 Perfect set of rationals. attachment  ...2 kindlychung 2010-10-2 17:37 107385 wangyangkee 2010-10-7 16:35
预览 Does Cantor set contain isolated points? kindlychung 2010-10-2 16:04 43702 wangyangkee 2010-10-7 16:34
预览 Cantor set completely seperated. attachment kindlychung 2010-10-3 15:28 13678 wangyangkee 2010-10-7 16:34
预览 Nonempty perfect set of irrational numbers attachment kindlychung 2010-10-3 15:44 13898 wangyangkee 2010-10-7 16:33
预览 set connected => set closure connected? attachment kindlychung 2010-10-2 20:30 95784 wangyangkee 2010-10-7 16:33
预览 F\sigma set and G\delta set attachment kindlychung 2010-10-1 16:17 54676 wangyangkee 2010-10-7 16:32
预览 Density of Q diluted? attachment kindlychung 2010-10-3 16:45 34406 wangyangkee 2010-10-7 16:31
预览 Sum of Cantor sets attachment kindlychung 2010-10-2 14:07 84505 wangyangkee 2010-10-7 16:31
预览 关于证明的路径 attachment popo 2010-10-5 20:02 74705 changbaoyu 2010-10-7 14:36
预览 请教：关于逆否命题 attachment  ...2 popo 2010-10-4 23:16 169973 changbaoyu 2010-10-7 13:17
预览 二氯甲烷立体结构是只有一种理论 XIAOYU6968 2010-10-7 11:38 04344 XIAOYU6968 2010-10-7 11:38
预览 催化剂与分遗产 XIAOYU6968 2010-10-7 11:31 04098 XIAOYU6968 2010-10-7 11:31
预览 [原创]让外国人来攻占我们这个山头——凤鸣山  ...2345 技术员 2010-9-28 21:41 4218288 elimqiu 2010-10-7 11:02
预览 【数论小题征解】已知a为质数，b为奇数，a^2+b^2=629.··· trx 2010-10-6 15:49 24181 trx 2010-10-7 08:24
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