학술논문
Refined enumeration of vertices among all rooted ordered $d$-trees
Document Type
Article
Source
대한수학회보, 56(4), pp.899-910 Jul, 2019
Subject
Language
English
ISSN
2234-3016
1015-8634
1015-8634
Abstract
In this paper, we enumerate the cardinalities for the set of all vertices of outdegree $\ge k$ at level $\ge \ell$ among all rooted ordered $d$-trees with $n$ edges. Our results unite and generalize several previous works in the literature.