Two Enumerative Results on Cycles of Permutations
Combinatorics
2009-01-15 v1
Abstract
Answering a question of Bona, it is shown that for n>1 the probability that 1 and 2 are in the same cycle of a product of two n-cycles on the set {1,2,...,n} is 1/2 if n is odd and 1/2 - 2/(n-1){n+2) if n is even. Another result concerns the generating function P_h(q) for the number of cycles of the product (1,2,...,n)w, where w ranges over all permutations of 1,2,...,n of cycle type h. A formula is obtained for P_h(q) from which it is proved that the zeros of P_h(q) have real part 0.
Keywords
Cite
@article{arxiv.0901.2008,
title = {Two Enumerative Results on Cycles of Permutations},
author = {Richard P. Stanley},
journal= {arXiv preprint arXiv:0901.2008},
year = {2009}
}
Comments
10 pages