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A Dichotomy for k-Regular Graphs with {0,1}-Vertex Assignments and Real Edge Functions

机译:具有{0,1}-顶点分配和实边功能的k正则图的二分法

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We prove a complexity dichotomy theorem for a class of Holant Problems over k-regular graphs, for any fixed k. These problems can be viewed as graph homomorphisms from an arbitrary k-regular input graph G to the weighted two vertex graph on {0,1} denned by a symmetric function h. We completely classify the computational complexity of this problem. We show that there are exactly the following alternatives, for any given h. Depending on h, over k-regular graphs: Either (1) the problem is #P-hard even for planar graphs; or (2) the problem is #P-hard for general (non-planar) graphs, but solvable in polynomial time for planar graphs; or (3) the problem is solvable in polynomial time for general graphs. The dependence on h is an explicit criterion. Furthermore, we show that in case (2) the problem is solvable in polynomial time over k-regular planar graphs, by exactly the theory of holographic algorithms using matchgates.
机译:我们证明了对于任意固定k的一类关于k正则图的Holant问题的复杂性二分法定理。这些问题可以看作是图形同态,从任意k正则输入图G到由对称函数h限定的{0,1}上的加权两个顶点图。我们将这个问题的计算复杂度完全分类。我们表明,对于任何给定的h,都存在以下完全正确的选择。根据h,在k个正则图上:(1)即使对于平面图,问题也是#P-hard;或(2)对于一般(非平面)图,该问题是#P-hard,但对于平面图,该问题在多项式时间内可解决;或(3)对于一般图形,该问题可以在多项式时间内解决。对h的依赖是一个明确的标准。此外,我们证明,在情况(2)中,通过使用匹配门的全息算法的理论,该问题在k正则平面图的多项式时间内是可解决的。

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