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arXiv 0905.2381cs.DScs.CC
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随机张量和种植集团

Random Tensors and Planted Cliques

S. Charles Brubaker, Santosh Vempala

摘要:

图的r-奇偶张量是邻接矩阵的推广,其中张量的元素表示由r个不同顶点诱导的子图中边数的奇偶性。对于r=2,它是边为1,非边为-1的邻接矩阵。随机图的邻接矩阵的2-范数是O(\sqrt{n})。这里我们证明了r-宇称张量的2-范数至多为f(r)\sqrt{n} \log^{O(r)} n,回答了Frieze和Kannan的一个问题,他们证明了r=3。因此,我们得到了一个紧密的联系之间的种植集团问题和找到一个向量,近似的2-范数的随机图的r-奇偶张量的问题。我们的证明方法是基于一个归纳应用的浓度的措施。

英文摘要:

The r-parity tensor of a graph is a generalization of the adjacency matrix, where the tensor's entries denote the parity of the number of edges in subgraphs induced by r distinct vertices. For r=2, it is the adjacency matrix with 1's for edges and -1's for nonedges. It is well-known that the 2-norm of the adjacency matrix of a random graph is O(\sqrt{n}). Here we show that the 2-norm of the r-parity tensor is at most f(r)\sqrt{n}\log^{O(r)}n, answering a question of Frieze and Kannan who proved this for r=3. As a consequence, we get a tight connection between the planted clique problem and the problem of finding a vector that approximates the 2-norm of the r-parity tensor of a random graph. Our proof method is based on an inductive application of concentration of measure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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