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
中科院分区:
文献类型:
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作者:
Schrijver, A
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.