The Pfaffian property of circulant graphs

The Pfaffian property of circulant graphs
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循环图的普法夫性质

DOI:
10.1016/j.dam.2014.09.002
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发表时间:
2015-01
影响因子:
1.1
通讯作者:
Yan Wang
Yan Wang
中科院分区:
数学3区
文献类型:
--
作者:
Fuliang Lu;Lianzhu Zhang;Yan Wang

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The importance of the Pfaffian property of a graph stems from the fact that if the graph is Pfaffian, then the number of its perfect matchings can be computed in polynomial time. A graph G is Pfaffian if there exists an orientation of G, denoted by G ⃗, such that the determinant of the skew adjacency matrix of G ⃗ equals the square of the number of perfect matchings of G. An undirected graph G=(V, E) with n vertices is a circulant graph, denoted by C n (a 1, a 2,…, a m), if there exists a labeling of the vertices of G, v 1, v 2,…, v n, and m integers, a 1, a 2,…, a m, such that the edge set E={v i v j: i− j≡±a k (mod n) for 1≤ k≤ m}. In this paper, the Pfaffian property of circulant graphs is completely characterized, that is, a simple connected circulant graph C n (a 1, a 2,…, a m) of even order is Pfaffian if and only if m= 1 or, m= 2 and a 1+ a 2 is odd.
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