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rainbowguy

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Originally posted by Pchief at 2011-01-16 17:10:41:
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3Â¥2011-01-16 17:41:54
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rainbowguy(½ð±Ò+5): 2011-01-16 18:36:30
E+{x0} = {x+x0 | x¡ÊE}

Ò»°ãµØ£¬ÏßÐÔ¿Õ¼äÖÐÁ½¸ö¼¯ºÏµÄºÍ A+B ={x+y | x¡ÊA, y¡ÊB}£¬ÉÏÀýÊǸöÌØÊâÇé¿ö£¬ÆäÖÐÒ»¸ö¼¯ºÏÊǶÀµã¼¯¡£
4Â¥2011-01-16 18:34:13
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rainbowguy

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5Â¥2011-01-16 18:36:49
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rainbowguy

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»¹ÒªÀÍ·³Pchief´óϺ£ºÁ½¸ö¼¯ºÏ{1,2}+{2,3}ÊǵÈÓÚ{1,2,2,3}£¨¼¯ºÏÏà¼ÓµÈÓÚ¼¯ºÏ²¢Ó뼯ºÏµÄ½»£©£¿
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Originally posted by Pchief at 2011-01-16 18:34:13:
E+{x0} = {x+x0 | x¡ÊE}

Ò»°ãµØ£¬ÏßÐÔ¿Õ¼äÖÐÁ½¸ö¼¯ºÏµÄºÍ A+B ={x+y | x¡ÊA, y¡ÊB}£¬ÉÏÀýÊǸöÌØÊâÇé¿ö£¬ÆäÖÐÒ»¸ö¼¯ºÏÊǶÀµã¼¯¡£

6Â¥2011-01-16 18:49:40
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{1,2}+{2,3}={3,4,5}

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7Â¥2011-01-16 18:55:09
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rainbowguy(½ð±Ò+5): 2011-01-16 21:23:35
Áí£º¼¯ºÏÂÛÖÐËùνµÄ¡°²»½»²¢¡± ÔÊÐí¼¯ºÏÖÐÓÐÖØ¸´µÄÔªËØ£¬µ«ÑϸñÀ´½²ÄÇÐ©ÖØ¸´µÄÔªËØ²¢·ÇÍ¬Ò»ÔªËØ¡£

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A1={1,2}  A2={2,3}

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{1,2,2,3}

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{(1,1), (2,1), (2,2), (3,2)}

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http://en.wikipedia.org/wiki/Disjoint_union

[ Last edited by Pchief on 2011-1-16 at 19:03 ]
8Â¥2011-01-16 19:02:30
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rainbowguy

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