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Pchief
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dx-null set ÀïÃæµÄ dx ²»ÊÇÖ¸ x µÄ΢·Ö£¬ËûµÄÒâ˼Ӧ¸ÃÊÇÓà dx ±íʾ Lebesgue ²â¶È£¬ dx-null set ¾ÍÊÇÁã²â¶È¼¯¡£ Ïà¶Ô±Õ¼¯µÄÒâ˼ÊÇ£¬Ïà¶ÔÓÚ A µÄ±Õ¼¯µÈÓÚÈ«¿Õ¼äÖÐij¸ö±Õ¼¯Óë A µÄ½»¡£ ºÃ±È˵ÔÚÊýÖáÉÏ£¬Áî A=(0,2)£¬B=(0,1]£¬ ¾¡¹Ü B ²¢²»ÊÇÊýÖáÉϵıռ¯£¬µ« B ÊÇÏà¶ÔÓÚ A µÄ±Õ¼¯£¬ÒòΪ B µÈÓÚÊýÖáÉϵıռ¯ [0,1] Óë A µÄ½»¡£ ×îºóÄǸö¸ÅÄîûÌý˵¹ý¡£ |
2Â¥2013-05-27 19:57:21
cowlemon
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3Â¥2013-05-28 15:38:35
cowlemon
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4Â¥2013-05-29 12:31:32
Pchief
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http://en.wikipedia.org/wiki/Lebesgue_measure ×¢ÒâÕâ¾ä»°£ºThe Lebesgue measure is often denoted dx, ... |
5Â¥2013-05-29 13:27:48
xxdyt
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Ò»¸ö¼¯ºÏ¶ÔÓ¦µÄÇÐÏß(Ãæ)£¬ÈçºÎÀí½â£¿ The blow-up limit around a boundary point. Usually, Given a domain U, if the boundary \partial U is not smooth (or differentiable) at some point x, then there is not derivative, equivalent no tangent plane (line). But in may case, the blowup limit of the B(x,r)\cap \partial U may exist in some weak sense, which is usually called tangent cone. the typical example the the domain U={x, |x|>0}, the 0 is not the smooth boundary point. But the tangent cone of 0 does exactly exist. [ Last edited by xxdyt on 2013-6-1 at 04:21 ] |
6Â¥2013-05-31 08:54:00













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