Abstract
The authors study the problem of bipartitioning a random graph of fixed finite valence using a mean-field replica-symmetric theory of an Ising ferromagnet with zero magnetisation constraint. The thermodynamics is determined by the probability distribution of an auxiliary field. The expression for the ground-state energy agrees with that proposed by Mezard and Parisi (1986) using a cavity-field method, but their expression for the fraction of crazy spins is reinterpreted.

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