English

Periodic Infinite Frieze Patterns of Type $\Lambda_{p_1,\ldots,p_n}$ and Dissections on Annuli

Combinatorics 2021-06-15 v1

Abstract

Finite frieze patterns with entries in Z[λp1,,λps]\mathbb{Z}[\lambda_{p_1},\ldots,\lambda_{p_s}] where {p1,,ps}Z3\{p_1,\ldots,p_s\} \subseteq \mathbb{Z}_{\geq 3} and λp=2cos(π/p)\lambda_p = 2 \cos(\pi/p) were shown to have a connection to dissected polygons by Holm and Jorgensen. We extend their work by studying the connection between infinite frieze patterns with such entries and dissections of annuli and once-punctured discs. We give an algorithm to determine whether a frieze pattern with entries in Z[λp1,,λps]\mathbb{Z}[\lambda_{p_1},\ldots,\lambda_{p_s}], finite or infinite, comes from a dissected surface. We introduce quotient dissections as a realization for some frieze patterns unrealizable by an ordinary dissection. We also introduce two combinatorial interpretations for entries of frieze patterns from dissected surfaces. These interpretations are a generalization of matchings introduced by Broline, Crowe, and Isaacs for finite frieze patterns over Z\mathbb{Z}.

Keywords

Cite

@article{arxiv.2106.06679,
  title  = {Periodic Infinite Frieze Patterns of Type $\Lambda_{p_1,\ldots,p_n}$ and Dissections on Annuli},
  author = {Esther Banaian and Jiuqi Chen},
  journal= {arXiv preprint arXiv:2106.06679},
  year   = {2021}
}

Comments

52 pages, many figures, comments welcome