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arXiv 0907.5137math.PR
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最长公共子序列的标准差

Standard deviation of the longest common subsequence

Jüri Lember, Heinrich Matzinger

摘要:

令$L_n$为两个独立i.i.d.长度为$n$的伯努利变量序列。证明了当Bernoulli变量的参数足够小时,$L_n$的标准差的阶数为$\sqrt{n}$.这验证了沃特曼的猜想在这种情况下[Philos.trans.R. Soc. Lond. Ser.B344(1994)383- 390]。Chvatal和Sankoff [J. Appl. Probab. 12(1975)306- 315],然而,这是不同的。

英文摘要:

Let $L_n$ be the length of the longest common subsequence of two independent i.i.d. sequences of Bernoulli variables of length $n$. We prove that the order of the standard deviation of $L_n$ is $\sqrt{n}$, provided the parameter of the Bernoulli variables is small enough. This validates Waterman's conjecture in this situation [Philos. Trans. R. Soc. Lond. Ser. B 344 (1994) 383--390]. The order conjectured by Chvatal and Sankoff [J. Appl. Probab. 12 (1975) 306--315], however, is different.

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