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arXiv 1602.03550math.CO
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基于部分Bell多项式的着色Dyck路的Enumeration

Enumeration of colored Dyck paths via partial Bell polynomials

Daniel Birmajer, Juan B. Gil, Peter R. W. McNamara, Michael D. Weiner

摘要:

我们考虑一类格路径的上升和下降的步骤有一定的限制,并使用它们作为积木来构建各种家庭的戴克路径。我们让每个构建块$P_j$采用$c_j$颜色,并计算给定半长度的所有有色Dyck路径。我们的方法是证明一个递归关系的卷积型,从而产生一个代表性的部分贝尔多项式,简化了处理不同的着色。这使得我们能够以统一的方式恢复Dyck路径和相关晶格路径的多个已知公式。

英文摘要:

We consider a class of lattice paths with certain restrictions on their ascents and down steps and use them as building blocks to construct various families of Dyck paths. We let every building block $P_j$ take on $c_j$ colors and count all of the resulting colored Dyck paths of a given semilength. Our approach is to prove a recurrence relation of convolution type, which yields a representation in terms of partial Bell polynomials that simplifies the handling of different colorings. This allows us to recover multiple known formulas for Dyck paths and related lattice paths in an unified manner.

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