Small subgraphs of random regular graphs

Small subgraphs of random regular graphs

The main aim of this short paper is to answer the following question. Given a fixed graph H , for which values of the degree d does a random d-regular graph on n vertices contain a copy of H with probability close to one?

Regular subgraphs of random graphs

In this paper, we prove that there exists a function ρk = (4 + o(1))k such that G(n, ρ/n) contains a k-regular graph with high probability whenever ρ > ρk. In the case of k = 3, it is also shown that G(n, ρ/n) contains a 3-regular graph with high probability whenever ρ > λ ≈ 5.1494. These are the first constant bounds on the average degree in G(n, p) for the existence of a k-regular subgraph. W...

Distribution of subgraphs of random regular graphs

The asymptotic distribution of small subgraphs of a random graph has been basically worked out (see Ruciński [5] for example). But for random regular graphs, the main techniques for proving, for instance, asymptotic normality, do not seem to be usable. One very recent result in this direction is to be found in [3], where switchings were applied to cycle counts. The aim of the present note is to...

On small subgraphs of random graphs

Sudden emergence of q-regular subgraphs in random graphs

– We investigate the computationally hard problem whether a random graph of finite average vertex degree has an extensively large q-regular subgraph, i.e., a subgraph with all vertices having degree equal to q. We reformulate this problem as a constraint-satisfaction problem, and solve it using the cavity method of statistical physics at zero temperature. For q = 3, we find that the first large...