F. Heydari

activity

20132021

most citedThe Prime Index Graph of a Group

2 citations · 3 across the 6 of their papers we have counts for

collaborators

6 papers

math.CO2021

On the Signed Complete Graphs with Maximum Index

N. Kafai, F. Heydari, N. Jafari Rad +1

Let $Γ = (K_{n}, H^{-})$ be a signed complete graph whose negative edges induce a subgraph $H$ . The index of $Γ$ is the largest eigenvalue of its adjacency matrix. In this paper we stud…

math.CO2019

On the eigenvalues of some signed graphs

M. Souri, F. Heydari, M. Maghasedi

Let $G$ be a simple graph and $A (G)$ be the adjacency matrix of $G$ . The matrix $S (G) = J - I - 2 A (G)$ is called the Seidel matrix of $G$ , where $I$ is an identity matrix and $J$ is…

math.AC2017★ 1 cited

On the intersection graph of ideals of a commutative ring

F. Heydari

Let $R$ be a commutative ring and $M$ be an $R$ -module, and let $I (R)^{*}$ be the set of all non-trivial ideals of $R$ . The $M$ -intersection graph of ideals of $R$ , denoted by $G_M(R…

math.GR2015★ 2 cited

The Prime Index Graph of a Group

S. Akbari, A. Ashtab, F. Heydari +2

Let $G$ be a group. The prime index graph of $G$ , denoted by $Π (G)$ , is the graph whose vertex set is the set of all subgroups of $G$ and two distinct comparable vertices $H$ and $…

math.AC2013

The M-Regular Graph of a Commutative Ring

M. J. Nikmehr, F. Heydari

Let $R$ be a commutative ring and $M$ be an $R$ -module, and let $Z (M)$ be the set of all zero-divisors on $M$ . In 2008, D.F. Anderson and A. Badawi introduced the regular graph of…

math.AC2013

The M-Principal Graph of a Commutative Ring

M. J. Nikmehr, F. Heydari

This paper has been withdrawn by the author because there are some typos in proofs.