English

Counting lattice points that appear as algebraic invariants of Cameron-Walker graphs

Commutative Algebra 2024-03-06 v1 Combinatorics

Abstract

In 2021, Hibi et. al. studied lattice points in N2\mathbb{N}^2 that appear as (\depthR/I,dimR/I)(\depth R/I,\dim R/I) when II is the edge ideal of a graph on nn vertices, and showed these points lie between two convex polytopes. When restricting to the class of Cameron--Walker graphs, they showed that these pairs do not form a convex lattice polytope. In this paper, for the edge ideal II of a Cameron--Walker graph on nn vertices, we find how many points in N2\mathbb{N}^2 appear as (\depth(R/I),dim(R/I))(\depth(R/I),\dim(R/I)), and how many points in N4\mathbb{N}^4 appear as (\depth(R/I),\reg(R/I),dim(R/I),\degh(R/I)).(\depth(R/I),\reg(R/I),\dim(R/I),\degh(R/I)).

Keywords

Cite

@article{arxiv.2403.02557,
  title  = {Counting lattice points that appear as algebraic invariants of Cameron-Walker graphs},
  author = {Sara Faridi and Iresha Madduwe Hewalage},
  journal= {arXiv preprint arXiv:2403.02557},
  year   = {2024}
}

Comments

16 pages, 4 figures