关于超图匹配与Füredi-Kahn-Seymour猜想的一些注记
Some remarks on hypergraph matching and the Füredi-Kahn-Seymour conjecture
AI总结:
本文研究Füredi-Kahn-Seymour猜想,证明其对秩3超图成立,并给出迭代舍入算法的改进界,优于基线保证。
摘要:
Füredi、Kahn和Seymour(1993年)的一个经典猜想指出:给定任意具有非负边权重$w(e)$的超图,存在一个匹配$M$,使得$\sum_{e \in M} (|e|-1+1/|e|)\\, w(e) \geq w^*$,其中$w^*$是最优分数匹配的值。我们证明该猜想对秩为3的超图成立,并且可由一种自然的迭代舍入算法实现。虽然一般猜想仍然开放,但我们给出了几个新的改进界。特别地,我们证明迭代舍入算法给出$\sum_{e \in M} (|e|-δ(e))\\, w(e) \geq w^*$,其中$δ(e) = |e|/(|e|^2+|e|-1)$,改进了基线保证$\sum_{e \in M} |e|\\,w(e) \geq w^*$。
英文摘要:
A classic conjecture of Füredi, Kahn and Seymour (1993) states that given any hypergraph with non-negative edge weights $w(e)$, there exists a matching $M$ such that $\sum_{e \in M} (|e|-1+1/|e|)\, w(e) \geq w^*$, where $w^*$ is the value of an optimum fractional matching. We show the conjecture is true for rank-3 hypergraphs, and is achieved by a natural iterated rounding algorithm. While the general conjecture remains open, we give several new improved bounds. In particular, we show that the iterated rounding algorithm gives $\sum_{e \in M} (|e|-δ(e))\, w(e) \geq w^*$, where $δ(e) = |e|/(|e|^2+|e|-1)$, improving upon the baseline guarantee of $\sum_{e \in M} |e|\,w(e) \geq w^*$.
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