CPC
2004
14 years 9 days ago
2004
Heap ordered trees are planted plane trees, labelled in such a way that the labels always increase from the root to a leaf. We study two parameters, assuming that p of the n nodes ...
RSA
2006
14 years 11 days ago
2006
We study three families of labelled plane trees. In all these trees, the root is
EJC
2006
14 years 14 days ago
2006
The problem of counting plane trees with n edges and an even or an odd number of leaves has been recently studied by Eu, Liu and Yeh, in connection with an identity on coloring ne...
EJC
2006
14 years 14 days ago
2006
Abstract. A leaf of a plane tree is called an old leaf if it is the leftmost child of its parent, and it is called a young leaf otherwise. In this paper we enumerate plane trees wi...
EJC
2010
14 years 16 days ago
2010
We consider plane trees whose vertices are given labels from the set {1, 2, . . . , k} in such a way that the sum of the labels along any edge is at most k + 1; it turns out that ...