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A short constructive proof of the Erdos-Gallai characterization of graphic lists

机译:简短的建设性证明,证明了图形列表的鄂尔多斯-加莱(Erdos-Gallai)特征

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摘要

Erdos and Gallai proved that a nonincreasing list (d(1),..., d(n)) of nonnegative integers is the list of degrees of a graph (with no loops or multi-edges) if and only if the sum is even and the list satisfies Sigma(k)(i=1) d(i) <= k(k -1) + Sigma(n)(i=k+1) min{k, d(i)} for 1 <= k <= n. We give a short constructive proof of the characterization.
机译:鄂尔多斯(Erdos)和加莱(Gallai)证明,当且仅当总和为时,非负整数的非递增列表(d(1),...,d(n))是图的度数列表(无环或多边)。偶数且列表满足Sigma(k)(i = 1)d(i)<= k(k -1)+ Sigma(n)(i = k + 1)min {k,d(i)} 1 = k <= n。我们提供了简短的结构化证明。

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