Random symmetric matrices are almost surely nonsingular

Random symmetric matrices are almost surely nonsingular
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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
V. Vu
中科院分区:
数学1区
文献类型:
--
作者:
Kevin P. Costello;T. Tao;V. Vu

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被引文献

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设Q_n表示一个随机对称n × n矩阵,其上对角元独立同分布.伯努利随机变量(取值为0和1的概率为1/2)。我们证明了$Q_n$是非奇异的概率为1-O(n^{-1/8+\delta})$对于任何固定的$\delta > 0$。证明使用二次版本的Littlewood-Offord型结果的浓度函数的随机变量,并可以扩展到更一般的模型的随机矩阵。
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.