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11Â¥2015-05-23 08:03:45
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wurongjun(½ð±Ò+1): лл²ÎÓë
12Â¥2015-05-23 08:21:11
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wurongjun

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feixiaolin: ½ð±Ò+5, С½±Ò»Ï 2015-05-24 05:52:52
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13Â¥2015-05-23 08:21:56
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mocean

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wurongjun(feixiaolin´ú·¢): ½ð±Ò+3 2015-05-23 10:20:19
wurongjun: ½ð±Ò+2 2015-05-26 08:31:36
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14Â¥2015-05-23 08:59:26
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feixiaolin: ½ð±Ò+1 2015-05-23 10:20:03
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15Â¥2015-05-23 09:47:22
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16Â¥2015-05-23 09:55:53
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17Â¥2015-05-23 10:31:52
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pippi6

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wurongjun: ½ð±Ò+1, ²»´í! 2015-05-23 11:51:34
wurongjun: ½ð±Ò+2 2015-05-26 08:31:05
Well, ËÆºõÊǵÂÓﵥλ¾ØÕóµÄËõд

An identity matrix may be denoted 1, I, or E (the latter being an abbreviation for the German term "Einheitsmatrix"; Courant and Hilbert 1989, p. 7). Identity matrices are sometimes also known as unit matrices (Akivis and Goldberg 1972, p. 71).

http://mathworld.wolfram.com/IdentityMatrix.html
18Â¥2015-05-23 11:28:49
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pippi6

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feixiaolin: ½ð±Ò+3 2015-05-23 19:26:19
Æäʵ£¬´ËÂÛ̳Ôç¾ÍÓйýÌÖÂÛ ...
http://muchong.com/bbs/viewthread.php?tid=2755638
19Â¥2015-05-23 17:55:11
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20Â¥2015-05-24 00:43:55
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