On the halves of a Riordan array and their antecedents
Combinatorics
2019-07-02 v2
Abstract
Every Riordan array has what we call a horizontal half and a vertical half. These halves of a Riordan array have been studied separately before. Here, we place them in a common context, showing that one may be obtained from the other. We also ask and answer the question: given a Riordan array, when is it the half (either horizontal of vertical) of a Riordan array?
Cite
@article{arxiv.1906.06373,
title = {On the halves of a Riordan array and their antecedents},
author = {Paul Barry},
journal= {arXiv preprint arXiv:1906.06373},
year = {2019}
}
Comments
19 pages, extended from first version