English

Inversion polynomials for 321-avoiding permutations: addendum

Combinatorics 2013-05-17 v1

Abstract

This addendum contains results about the inversion number and major index polynomials for permutations avoiding 321 which did not fit well into the original paper. In particular, we consider symmetry, unimodality, behavior modulo 2, and signed enumeration.

Keywords

Cite

@article{arxiv.1305.3845,
  title  = {Inversion polynomials for 321-avoiding permutations: addendum},
  author = {Szu-En Cheng and Sergi Elizalde and Anisse Kasraoui and Bruce E. Sagan},
  journal= {arXiv preprint arXiv:1305.3845},
  year   = {2013}
}

Comments

8 pages, 1 figure. arXiv admin note: text overlap with arXiv:1112.6014

R2 v1 2026-06-22T00:17:42.567Z