Counting 1-factors in regular bipartite graphs

Counting 1-factors in regular bipartite graphs
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DOI:
10.1006/jctb.1997.1798
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发表时间:
1998-01-01
影响因子:
1.4
通讯作者:
Schrijver, A
Schrijver, A
中科院分区:
数学2区
文献类型:
--
作者:
Schrijver, A

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我们表明,任何具有2N顶点的K规范两分图至少具有((k-1)(k-1)/k(k-2))(n)完美匹配(1因子)。等效地,这是任何非负整数N x n矩阵的永久性上的下限,每个行和列总和等于k。对于任何K,基数(K-1)(K-1)/K(K-2)最大。 (c)1998学术出版社。
We show that any k-regular bipartite graph with 2n vertices has at least((k - 1)(k-1)/k(k-2))(n)perfect matchings (1-factors). Equivalently, this is a lower bound on the permanent of any nonnegative integer n x n matrix with each row and column sum equal to k. For any k, the base (k - 1)(k-1)/k(k-2) is largest possible. (C) 1998 Academic Press.