Prove 相鄰的邊最多4個 that means 平均相鄰的邊的角度是360/4 = 90度,那是平均值,和人習慣看相鄰的邊界最多的度數
假如是鈍角、另一邊的線條就是銳角如果只取一邊鈍角,另一邊無接觸,就能破解四色定理,就需要五色才能填滿,以下是概念圖。
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