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Relative g-noncommuting graph of finite groups

Group Theory 2020-08-11 v1

Abstract

Let GG be a finite group. For a fixed element gg in GG and a given subgroup HH of GG, the relative gg-noncommuting graph of GG is a simple undirected graph whose vertex set is GG and two vertices xx and yy are adjacent if xHx \in H or yHy \in H and [x,y]g,g1[x,y] \neq g, g^{-1}. We denote this graph by ΓH,Gg\Gamma_{H, G}^g. In this paper, we obtain computing formulae for degree of any vertex in ΓH,Gg\Gamma_{H, G}^g and characterize whether ΓH,Gg\Gamma_{H, G}^g is a tree, star graph, lollipop or a complete graph together with some properties of ΓH,Gg\Gamma_{H, G}^g involving isomorphism of graphs. We also present certain relations between the number of edges in ΓH,Gg\Gamma_{H, G}^g and certain generalized commuting probabilities of GG which give some computing formulae for the number of edges in ΓH,Gg\Gamma_{H, G}^g. Finally, we conclude this paper by deriving some bounds for the number of edges in ΓH,Gg\Gamma_{H, G}^g.

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Cite

@article{arxiv.2008.04123,
  title  = {Relative g-noncommuting graph of finite groups},
  author = {Monalisha Sharma and Rajat Kanti Nath},
  journal= {arXiv preprint arXiv:2008.04123},
  year   = {2020}
}

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23 pages