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- W1554080308 abstract "Let G be a bipartite graph with a bicoloration {A,B}, |A|=|B|. Let E(G) → A x B denote the edge set of G, and let m(G) denote the number of perfect matchings of G. Let K be a (multiplicative) finite abelsian group |K| = k, and let w:E(G) → K be a weight assignment on the edges of G. FOr S → E(G) let w(S) = ∏e∈Sw(e). A perfect matching M of G is a w-matching if w(M)=1. We shall be interested in m(G,w), the number of w-matchings of G. It is shown that if deg(a) ≥ d for all a ∈ A, then either G has no w-matchings, or G has at least (d - k + 1)! w-matchings." @default.
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- W1554080308 date "1998-01-01" @default.
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- W1554080308 doi "https://doi.org/10.1023/a:1008671206536" @default.
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