Kakeya needle problem 答案是arbitrarily small
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新语丝读书论坛
送交者: lightman 于 2009-01-15, 03:22:23:
Wiki里都说了,引用的都没仔细看吗?
http://en.wikipedia.org/wiki/Kakeya_set#Kakeya_needle_problem
引用:
Besicovitch[2] was able to show that there is no lower bound > 0 for the area of such a region D, in which a needle of unit length can be turned round.
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这个理论好,就叫资源紧张的条件下创建和谐社会的数学基础 (无内容)
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田野
(0 bytes)
2009-01-15, 08:13:45
(293233)
如果为0的话,问题已经变质了吧?
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田野
(21 bytes)
2009-01-15, 08:10:20
(293232)
What makes you think of "如果为0"?
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LaoXiao
(108 bytes)
2009-01-15, 08:45:51
(293235)
“Besicovitch's work
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田野
(109 bytes)
2009-01-15, 11:25:02
(293251)
"Adapting this method further,
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田野
(143 bytes)
2009-01-15, 11:15:50
(293248)
Thanks for the info. It talks about, however,
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LaoXiao
(142 bytes)
2009-01-15, 12:16:34
(293270)
The limit is also a Besicovitch set
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lightman
(207 bytes)
2009-01-15, 15:24:24
(293324)
Agree.
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LaoXiao
(403 bytes)
2009-01-15, 16:20:11
(293339)
挂谷问题(Kakeya needle problem)是如何想出来的?
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sl
(393 bytes)
2009-01-15, 03:44:42
(293217)
挺好,我看到这个题目时就觉得这是个很实用的问题,
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老中乙号
(170 bytes)
2009-01-15, 05:24:00
(293220)
"一开始就是由生产决定的", 后来就被数学家搞歪了.什么测度为0也搞出来了. (无内容)
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008
(0 bytes)
2009-01-15, 13:42:24
(293286)
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