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arXiv 1606.02183math.CO
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有理Dyck路与无因子Dyck词的enumeration

On rational Dyck paths and the enumeration of factor-free Dyck words

Daniel Birmajer, Juan B. Gil, Michael D. Weiner

摘要:

受Bizley和Duchon的独立结果的启发,我们研究了有理Dyck路及其无因子元子集。一方面,我们给出了有理Dyck路和正则Dyck路之间的一个双射,其中上升部分被无因子词着色。这种双射导致了一个新的统计的基础上的减少水平的路径,我们提供了一个相应的公式。另一方面,我们证明了通过部分贝尔多项式定义的某些序列的逆关系,我们用它来推导出一个公式的枚举因子自由的话。此外,我们给出了替代公式的各种枚举序列中出现的情况下,合理的戴克路径。

英文摘要:

Motivated by independent results of Bizley and Duchon, we study rational Dyck paths and their subset of factor-free elements. On the one hand, we give a bijection between rational Dyck paths and regular Dyck paths with ascents colored by factor-free words. This bijection leads to a new statistic based on the reducibility level of the paths for which we provide a corresponding formula. On the other hand, we prove an inverse relation for certain sequences defined via partial Bell polynomials, and we use it to derive a formula for the enumeration of factor-free words. In addition, we give alternative formulas for various enumerative sequences that appear in the context of rational Dyck paths.

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