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首页> 外文期刊>SIAM Journal on Discrete Mathematics >RESILIENT PANCYCLICITY OF RANDOM AND PSEUDORANDOM GRAPHS
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RESILIENT PANCYCLICITY OF RANDOM AND PSEUDORANDOM GRAPHS

机译:随机和伪随机图的弹性泛滥

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摘要

A graph G on n vertices is pancyclic if it contains cycles of length t for all 3 ≤ t≤ n. In this paper we prove that for any fixed ε > 0, the random graph G(n,p) with p(n)》 n~1/2 (i.e., with p(n)~1/2 tending to infinity) asymptotically almost surely has the following resilience property. If H is a subgraph of G with maximum degree at most (1/2 —ε)np, then G — H is pancyclic. In fact, we prove a more general result which says that if p》 n~1+1/(1-1) for some integer l ≥ 3, then for any ε > 0, asymptotically almost surely every subgraph of G(n,p) with minimum degree greater than (1/2 + ε)np contains cycles of length t for all l ≤ t≤ n. These results are tight in two ways. First, the condition on p essentially cannot be relaxed. Second, it is impossible to improve the constant 1/2 in the assumption for the minimum degree. We also prove corresponding results for pseudorandom graphs.
机译:如果对所有3≤t≤n都包含长度为t的循环,则n个顶点上的图G为全循环。本文证明,对于任何固定的ε> 0,随机图G(n,p)具有p(n)》 n〜1/2(即p(n)/ n〜1/2趋于无穷大) )几乎肯定具有以下弹性。如果H是G的子图,最大程度为(1/2-ε)np,则G-H为全环。实际上,我们证明了一个更笼统的结果,即如果对于某些整数l≥3,p〉 n〜1 + 1 /(1-1),那么对于任何ε> 0,几乎可以肯定地渐近确定G(n,最小度数大于(1/2 +ε)np的p)对于所有l≤t≤n都包含长度为t的循环。这些结果在两个方面都很严格。首先,p上的条件基本上不能放松。第二,在最小度的假设中不可能提高常数1/2。我们还证明了伪随机图的相应结果。

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