如何证明一个不含三角形的n阶简单图，其各顶点度数的平方和小于等于mn（m是边的个数）。 知乎 Sketch Coloring Page

如何证明一个不含三角形的n阶简单图，其各顶点度数的平方和小于等于mn（m是边的个数）。 知乎 Template

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