Circuits in random graphs: from local trees to global loops

Abstract
We compute the number of circuits and of loops with multiple crossings in random regular graphs. We discuss the importance of this issue for the validity of the cavity approach. On the one hand we obtain analytical results for the infinite volume limit in agreement with existing exact results. On the other hand we implement a counting algorithm, enumerate circuits at finite N, and draw some general conclusions about the finite-N behaviour of the number of circuits.
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