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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tomski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 coloring