Random symmetric matrices are almost surely nonsingular
Random symmetric matrices are almost surely nonsingular
复制标题
随机对称矩阵几乎肯定是非奇异的
DOI:
10.1215/s0012-7094-06-13527-5
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发表时间:
2005
影响因子:
2.5
通讯作者:
V. Vu
中科院分区:
文献类型:
--
作者:
Kevin P. Costello;T. Tao;V. Vu
Let $Q_n$ denote a random symmetric $n$ by $n$ matrix, whose upper diagonal entries are i.i.d. Bernoulli random variables (which take values 0 and 1 with probability 1/2). We prove that $Q_n$ is non-singular with probability $1-O(n^{-1/8+\delta})$ for any fixed $\delta > 0$. The proof uses a quadratic version of Littlewood-Offord type results concerning the concentration functions of random variables and can be extended for more general models of random matrices.