Degree sum conditions of ID-factor-critical graphs are studied. A lower bound for the degree sum of any two nonadjacent vertices such that G is ID-factor-critical is obtained, and the bound is sharp.

本文研究ID-因子临界图的度和条件，得到使得图G是ID-因子临界图的任意两个不相邻的顶点的度和的下界，同时说明这些结果是最好可能的。

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That was brought into sharp focus Thursday when South Korean President Lee Myung-bak, host of the G-20 summit, was asked at a press conference about the impact of the Fed's decision.

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