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arxiv 1106.1290 v2 pith:BCF6NMLJ submitted 2011-06-07 math.CO

On the enumeration of rooted trees with fixed size of maximal decreasing trees

classification math.CO
keywords decreasingmaximalrootedtreeslabeledsubtreedefinededges
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Let $\T_{n}$ be the set of rooted labeled trees on $\set{0,...,n}$. A maximal decreasing subtree of a rooted labeled tree is defined by the maximal subtree from the root with all edges being decreasing. In this paper, we study a new refinement $\T_{n,k}$ of $\T_n$, which is the set of rooted labeled trees whose maximal decreasing subtree has $k+1$ vertices.

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