考虑完全图K4的列表边染色 X X3 4 设X是每条边所染的颜色（值)；在点山周围，必须满足 X1≠X2)X1-X2≠0 X1≠X6)X1-X6≠0 →(X1-X2)(X1-X6)(x2-X6)≠0 X2≠X6→X2-X6≠0考虑完全图 K4的列表边染色 --------------------------------------------------------- 设 xi是每条边所染的颜色（值）；在点 u 周围，必须满足 x1≠x2  x1-x2≠0 x1≠x6  x1-x6≠0  (x1-x2)(x1-x6)(x2-x6) ≠0 x2≠x6  x2-x6≠0