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Counting the Number of Perfect Matchings in K5-Free Graphs

机译:计数K5 - 自由图中完美匹配的数量

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Counting the number of perfect matchings in arbitrary graphs is a sharpP-complete problem. However, for some restricted classes of graphs the problem can be solved efficiently. In the case of planar graphs, and even for K_{3, 3}-free graphs, Vazirani showed that it is in NC^2. The technique there is to compute a Pfaffian orientation of a graph. In the case of K_5-free graphs, this technique will not work because some K_5-free graphs do not have a Pfaffian orientation. We circumvent this problem and show that the number of perfect matchings in K_5-free graphs can be computed in polynomial time and we describe a circuit construction in TC2.
机译:计算任意图中完美匹配的数量是一个锐利完整的问题。但是,对于一些限制的图表,问题可以有效地解决。在平面图的情况下,甚至对于K_ {3,3} -Free图,Vazirani表明它处于NC ^ 2中。该技术是计算图形的PFaffian方向。在k_5的图形的情况下,这种技术将不起作用,因为某些k_5无图没有PFaffian方向。我们规避了这个问题,并表明可以在多项式时间中计算K_5-Free图表中完美匹配的数量,并在TC2中描述了一种电路结构。

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