Abstract
Let R( r 1,…, r m ) and S( s 1,…, s n ) be two nonnegative integral vectors, and let U ( R,S) denote the class of all m× n matrices of 0's and 1's having row sum vector R and column sum vector S. We prove that if s 1 s 2⋯ s n 1, the interchange graph G( R, S) of U ( R, S) is hamiltonian.
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