Hafnian

In mathematics, the hafnian of an adjacency matrix of a graph is the number of perfect matchings in the graph. It was so named by Eduardo R. Caianiello "to mark the fruitful period of stay in Copenhagen (Hafnia in Latin)."

The hafnian is computed as

where $S_n$ is the symmetric group on [n].

单词	Hafnian
释义	Hafnian 英语百科 Hafnian In mathematics, the hafnian of an adjacency matrix of a graph is the number of perfect matchings in the graph. It was so named by Eduardo R. Caianiello "to mark the fruitful period of stay in Copenhagen (Hafnia in Latin)." The hafnian is computed as where $S_n$ is the symmetric group on [n].
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