English

Extremal distance spectral radius of graphs with $h$-extra $r$-component connectivity

Combinatorics 2025-09-29 v1

Abstract

For two integers r2r\geq 2 and h0h\geq 0, the hh-extra rr-component connectivity of a graph GG, denoted by cκrhc\kappa_{r}^{h}, is defined as the minimum number of vertices whose removal produces a disconnected graph with at least rr components, where each component contains at least h+1h+1 vertices. Let Gn,δcκrh\mathcal{G}_{n,\delta}^{c\kappa_{r}^{h}} represent the set of graphs of order nn with minimum degree δ\delta and hh-extra rr-component connectivity cκrhc\kappa_{r}^{h}. Hu, Lin, and Zhang [\textit{Discrete Math.} \textbf{345} (2025) 114621] investigated the case when h=0h=0 within Gn,δcκrh\mathcal{G}_{n,\delta}^{c\kappa_{r}^{h}}, and characterized the corresponding extremal graphs that minimize the distance spectral radius. In this paper, we further explore the relevant extremal graphs in Gn,δcκrh\mathcal{G}_{n,\delta}^{c\kappa_{r}^{h}} for h1h\geq 1.

Keywords

Cite

@article{arxiv.2509.22538,
  title  = {Extremal distance spectral radius of graphs with $h$-extra $r$-component connectivity},
  author = {Daoxia Zhang and Dan Li and Wenxiu Ding},
  journal= {arXiv preprint arXiv:2509.22538},
  year   = {2025}
}