(Q25101392)

English

hafnian

given an adjacency matrix of a graph, the number of perfect matchings in the graph

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defining formula

\operatorname {haf} (A)={\frac {1}{n!2^{n}}}\sum _{\sigma \in S_{2n}}\prod _{j=1}^{n}A_{\sigma (2j-1),\sigma (2j)}

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WikiProject Mathematics

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https://en.wikipedia.org/w/index.php?title=Hafnian&oldid=985384320

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enwiki Hafnian

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