Abstract

A perfect matching or a 1-factor of a graph G is a spanning subgraph that is regular of degree one. Hence a perfect matching is a set of independent edges which matches all the nodes of G in pairs. Thus in a hypercube parallel processor, the number of perfect matchings evaluates the number of different ways that all the processors can pairwise exchange information in parallel. Making use of matrices and their permanents one can write a straightforwardformula which we evaluate for n ≤ 5.

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