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實質上就是求四階完全圖K4的非同構的生成子圖,一共有11個,耿素雲的教材上有. 方法就是從邊數和度數著手,邊數只能是0、1、2、3、4、5、6,而每個頂點的度數在0到3之間,由此得到結果 0條邊:1個 1條邊:1個 2條邊:2個 3條邊:3個 4條邊:2個 5條邊:1個 6條邊:1個
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