Statistics on Multisets
Combinatorics
2018-08-28 v1
Abstract
We offer a new proof that a certain q-analogue of multinomial coeffi- cients furnishes a q-counting of the set of permutations of an associated multiset of positive integers, according to the number of inversions in such arrangements. Our proof uses the fact that such q-multinomial coefficients enumerate certain classes of chains of subspaces of a fnite dimensional vector space over a fnite field of cardinality q. Additionally, we investigate the function that counts the number of permutations of a multiset having a fixed number of inversions.
Cite
@article{arxiv.1808.08906,
title = {Statistics on Multisets},
author = {Shashikant Mulay and Carl Wagner},
journal= {arXiv preprint arXiv:1808.08906},
year = {2018}
}