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2Â¥: Originally posted by hank612 at 2014-07-01 04:18:20
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Ä㿼ÂÇthe power set  (http://en.wikipedia.org/wiki/Power_set) µÄHasse Diagram (http://en.wikipedia.org/wiki/Partially_ordered_set).

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Ö»ÊǸöÏë·¨ ²»ÖªÊÇ·ñ¿ÉÐÐ?

Ä㿼ÂÇthe power set  (http://en.wikipedia.org/wiki/Power_set) µÄHasse Diagram (http://en.wikipedia.org/wiki/Partially_ordered_set).

ÄãÏëÇóµÄÊÇ Hasse ͼµÄÉú³ÉÊ÷(spanning tree)µÄ¸öÊý, Òò´Ëд³öLaplacian ¾ØÕó, Ëæ±ãɾ³ýÆäÖÐÈÎÒ»ÐÐ, ÈÎÒ»ÁÐ, ¼ÆËãÐÐÁÐʽ, ËüµÄ¾ø¶ÔÖµÉú³ÉÊ÷µÄ¸öÊý(kirchhoff ¶¨Àí http://en.wikipedia.org/wiki/Kirchhoff%27s_theorem)

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We_must_know. We_will_know.
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