English

The $v$-number of generalized binomial edge ideals of some graphs

Commutative Algebra 2026-04-08 v2

Abstract

Let GG be a finite connected simple graph, and let JKm,G\mathcal{J}_{K_m,G} denote its generalized binomial edge ideal. By investigating the colon ideals of JKm,G\mathcal{J}_{K_m,G}, we derive a formula for the local v\mathrm{v}-number of JKm,G\mathcal{J}_{K_m,G} with respect to the empty cut set. Furthermore, we classify graphs for which this generalized binomial edge ideal has v\mathrm{v}-numbers 11 or 22. When GG is a connected closed graph, we compute the local v\mathrm{v}-number of JK2,G\mathcal{J}_{K_2,G} by generalizing the work of Dey et al. Additionally, under the condition that GG is Cohen--Macaulay, we derive formulas for the v\mathrm{v}-number of JKm,G\mathcal{J}_{K_m,G} and JK2,Gk\mathcal{J}_{K_2,G}^k, and show that the v\mathrm{v}-number of JK2,Gk\mathcal{J}_{K_2,G}^k is a linear function of kk.

Keywords

Cite

@article{arxiv.2603.29516,
  title  = {The $v$-number of generalized binomial edge ideals of some graphs},
  author = {Yi-Huang Shen and Guangjun Zhu},
  journal= {arXiv preprint arXiv:2603.29516},
  year   = {2026}
}