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arXiv math/0004082math.COmath.PR
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最长递增子序列问题的一个平均恒等式

A mean identity for longest increasing subsequence problems

Eric M. Rains

摘要:

我们发现,各种各样的广义增长子序列问题承认一个参数家庭的扩展,我们可以准确地计算最长的增长子序列的平均长度。根据扩展的性质,这给出了未扩展模型中平均值的上界,这对于迄今为止分析的所有模型都是渐近紧的。基于这一事实的启发式分析不仅给出了渐近平均值,而且给出了渐近比例因子,再次与所有已知情况一致。

英文摘要:

We show that a wide variety of generalized increasing subsequence problems admit a one parameter family of extensions for which we can exactly compute the mean length of the longest increasing subsequence. By the nature of the extension, this gives upper bounds on the mean in the unextended model, which turn out to be asymptotically tight for all of the models that have so far been analyzed. A heuristic analysis based on this fact gives not just the asymptotic mean but also the asymptotic scale factor, again agreeing with all known cases.

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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