Refined enumeration of vertices among all rooted ordered $d$-trees
published by Heesung Shin
in 2018
and research's language is
English
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Abstract in English
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.