On binomial edge ideals of corona of graphs
Abstract
For a simple graph , let denote the corresponding binomial edge ideal. This article considers the binomial edge ideal of the corona product of two connected graphs and . The corona product of and , denoted by , is a construction where each vertex of is connected (via the coning-off) to an entire copy of . This is a direct generalization of a cone construction. Previous studies have shown that for to be Cohen-Macaulay, both and must be complete graphs. However, there are no general formulae for the dimension, depth, or Castelnuovo-Mumford regularity of for all graphs and . In this article, we provide a general formula for the dimension, depth and Castelnuovo-Mumford regularity of the binomial edge ideals of certain corona and corona-type (somewhat a generalization of corona) products of special interests. Additionally, we study the Cohen-Macaulayness, unmixedness and related properties of binomial edge ideals corresponding to above class of graphs. We have also added a short note on the reduction of the Bolognini-Macchia-Strazzanti Conjecture to all graphs with a diameter of .
Keywords
Cite
@article{arxiv.2503.12114,
title = {On binomial edge ideals of corona of graphs},
author = {Buddhadev Hajra and Rajib Sarkar},
journal= {arXiv preprint arXiv:2503.12114},
year = {2025}
}
Comments
22 pages, comments and suggestions are welcome