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arXiv 1707.02635math.PRmath.CO
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移位$d$ -正则随机方阵的最小奇异值

The smallest singular value of a shifted $d$-regular random square matrix

Alexander Litvak, Anna Lytova, Konstantin Tikhomirov, Nicole Tomczak-Jaegermann, Pierre Youssef

摘要:

我们导出了随机$d$ -正则矩阵的最小奇异值的一个下界,即随机$d$ -正则有向图的邻接矩阵。更精确地说,令$C_1<d< c_1 n/\log^2 n$和$\mathcal{M}_{n,d}$是所有$0/1$值的$n\times n$方阵的集合,使得矩阵$M\in \mathcal{M}_{n,d}$的每一行和每一列都恰好有$d$ 1.令$M$均匀分布在$\mathcal{M}_{n,d}$上。则$M$的最小奇异值$s_{n} (M)$以至少$1-C_2\log^2 d/\sqrt{d}$的概率大于$c_2 n^{-6}$,其中$c_1$、$c_2$、$C_1$和$C_2$是独立于任何其它参数的绝对正常数。

英文摘要:

We derive a lower bound on the smallest singular value of a random $d$-regular matrix, that is, the adjacency matrix of a random $d$-regular directed graph. More precisely, let $C_1<d< c_1 n/\log^2 n$ and let $\mathcal{M}_{n,d}$ be the set of all $0/1$-valued square $n\times n$ matrices such that each row and each column of a matrix $M\in \mathcal{M}_{n,d}$ has exactly $d$ ones. Let $M$ be uniformly distributed on $\mathcal{M}_{n,d}$. Then the smallest singular value $s_{n} (M)$ of $M$ is greater than $c_2 n^{-6}$ with probability at least $1-C_2\log^2 d/\sqrt{d}$, where $c_1$, $c_2$, $C_1$, and $C_2$ are absolute positive constants independent of any other parameters.

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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