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On the sizes of large subgraphs of the binomial random graph
Institution:1. Department of Mathematical Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;2. Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprodny, Moscow Region, 141701, Russian Federation;3. Adyghe State University, Caucasus Mathematical Center, ul. Pervomayskaya, 208, Maykop, Republic of Adygea, 385000, Russian Federation;4. The Russian Presidential Academy of National Economy and Public Administration, Prospect Vernadskogo, 84, bldg 2, Moscow, 119571, Russian Federation;5. Moscow Center for Fundamental and Applied Mathematics, Russian Federation
Abstract:We consider the binomial random graph G(n,p), where p is a constant, and answer the following two questions.First, given e(k)=p(k2)+O(k), what is the maximum k such that a.a.s. the binomial random graph G(n,p) has an induced subgraph with k vertices and e(k) edges? We prove that this maximum is not concentrated in any finite set (in contrast to the case of a small e(k)). Moreover, for every constant C>0, with probability bounded away from 0, the size of the concentration set is bigger than Cn/ln?n, and, for every ωn, a.a.s. it is smaller than ωnn/ln?n.Second, given k>εn, what is the maximum μ such that a.a.s. the set of sizes of k-vertex subgraphs of G(n,p) contains a full interval of length μ? The answer is μ=Θ((n?k)nln?(nk)).
Keywords:Random graph  Induced subgraphs  Large subgraphs
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