3 search results - page 1 / 1 » Bijections for Hook Pair Identities |
COMBINATORICS
2000
13 years 4 months ago
2000
Short, bijective proofs of identities for multisets of `hook pairs' (arm-leg pairs) of the cells of certain diagrams are given. These hook pair identities were originally foun...
COMBINATORICS
2006
13 years 4 months ago
2006
In [5] the authors refine the well-known permutation statistic "descent" by fixing parity of one of the descent's numbers. In this paper, we generalize the results o...
EJC
2006
13 years 4 months 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...