The Importance of Being Biased
STOC '02 Proceedings of the thiry-fourth annual ACM symposium on Theory of computing（2001）
摘要
(MATH) We show that the Minimum Vertex Cover problem is NP-hard to approximate to within any factor smaller than $10\sqrt{5}-21 \approx 1.36067$, improving on the previously known hardness result for a $\frac{7}{6}$ factor.
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