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arXiv 0707.4565cs.CCmath.CO
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关于交错多项式的复杂性

On the Complexity of the Interlace Polynomial

Markus Bläser, Christian Hoffmann

摘要:

我们考虑由Arratia,Bollobas和Sorkin(2004)引入的二元交错多项式。我们开发的图形变换,使我们能够获得点到点减少交错多项式。利用这些减少,我们得到了新的结果有关的计算复杂性评价交错多项式在一个固定的点。关于确切的评价,我们证明了交错多项式是P-难以评估的每一个点的平面,除了一行,它是平凡的多项式时间可计算的,和四行,其中的复杂性仍然是开放的。这解决了Arratia,Bollobas和Sorkin(2004)提出的问题。特别是,两变量交错多项式的三种特殊化,顶点零交错多项式,顶点秩交错多项式和独立集多项式,几乎到处都是P-难以评估的。对于独立集多项式,我们的约简使我们能够证明,它甚至很难近似在任何点,除了在0。

英文摘要:

We consider the two-variable interlace polynomial introduced by Arratia, Bollobas and Sorkin (2004). We develop graph transformations which allow us to derive point-to-point reductions for the interlace polynomial. Exploiting these reductions we obtain new results concerning the computational complexity of evaluating the interlace polynomial at a fixed point. Regarding exact evaluation, we prove that the interlace polynomial is #P-hard to evaluate at every point of the plane, except on one line, where it is trivially polynomial time computable, and four lines, where the complexity is still open. This solves a problem posed by Arratia, Bollobas and Sorkin (2004). In particular, three specializations of the two-variable interlace polynomial, the vertex-nullity interlace polynomial, the vertex-rank interlace polynomial and the independent set polynomial, are almost everywhere #P-hard to evaluate, too. For the independent set polynomial, our reductions allow us to prove that it is even hard to approximate at any point except at 0.

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