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arXiv 2007.15562math.COcs.DM
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广义Dyck路径中的下行步统计

Down-step statistics in generalized Dyck paths

Andrei Asinowski, Benjamin Hackl, Sarah J. Selkirk

AI总结:

本文研究广义Dyck路径中上步对间下行步的计数,通过双射和生成函数证明,发现与穿孔卷积码的联系,并给出Catalan数的新组合解释。

摘要:

研究了$k_t$-Dyck路径中上步对之间下行步的数量,$k_t$-Dyck路径是由步长$\((1, k), (1, -1)\)$组成的Dyck路径的推广,使得路径保持(弱)高于线$y=-t$。结果通过双射方法和生成函数证明,并引出了几个有趣的恒等式以及与其他组合结构的联系。特别是,$k_t$-Dyck路径与编码理论中用于穿孔卷积码(二进制矩阵)的穿孔模式之间存在联系。令人惊讶的是,限制到通常的Dyck路径时,这产生了Catalan数的一个新的组合解释。

英文摘要:

The number of down-steps between pairs of up-steps in $k_t$-Dyck paths, a generalization of Dyck paths consisting of steps $\{(1, k), (1, -1)\}$ such that the path stays (weakly) above the line $y=-t$, is studied. Results are proved bijectively and by means of generating functions, and lead to several interesting identities as well as links to other combinatorial structures. In particular, there is a connection between $k_t$-Dyck paths and perforation patterns for punctured convolutional codes (binary matrices) used in coding theory. Surprisingly, upon restriction to usual Dyck paths this yields a new combinatorial interpretation of Catalan numbers.

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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