Volume 4, Issue 1


ارسال های اخیر

  • A note on a graph related to the comaximal ideal graph of a commutative ring 

    Visweswaran, Subramanian؛ Parejiya, Jaydeep (Yazd University, 2017-02-01)
    ‎The rings considered in this article are commutative with identity which admit at least two maximal ideals‎.  ‎This article is inspired by the work done on the comaximal ideal graph of a commutative ring‎. ‎Let R ...

  • On two-dimensional Cayley graphs 

    Behtoei, Ali؛ Golkhandy Pour, yasser (Yazd University, 2017-02-01)
    A subset W of the vertices of a graph G is a resolving set for G when for each pair of distinct vertices u,v in V (G) there exists w in W ...

  • On the Edge-Difference and Edge-Sum Chromatic Sum of the Simple Graphs 

    Rahimi Sharbaf, S.؛ Erfani, Kh. (Yazd University, 2017-02-01)
    ‎For a coloring $c$ of a graph $G$‎, ‎the edge-difference coloring sum and edge-sum coloring sum with respect to the coloring $c$ are respectively‎ ‎$sum_c D(G)=sum |c(a)-c(b)|$ and $sum_s S(G)=sum (c(a)+c(b))$‎, ‎where ...

  • The Main Eigenvalues of the Undirected Power Graph of a Group 

    Javarsineh, Mehrnoosh؛ Fath-Tabar, Gholam Hossein (Yazd University, 2017-02-01)
    The undirected power graph of a finite group $G$, $P(G)$, is a graph with the group elements of $G$ as vertices and two vertices are adjacent if and only if one of them is a power of the other. Let $A$ be an adjacency ...

  • D-Spectrum and D-Energy of Complements of Iterated Line Graphs of Regular Graphs 

    Gopalapillai, Indulal (Yazd University, 2017-02-01)
    The D-eigenvalues {µ1,…,µp} of a graph G are the eigenvalues of its distance matrix D and form its D-spectrum. The D-energy, ED(G) of G is given by ED (G) =∑i=1 ...

  • Small graphs with exactly two non-negative eigenvalues 

    Derikvand, Tajedin؛ Oboudi, Mohammad Reza (Yazd University, 2017-02-01)
    Let $G$ be a graph with eigenvalues $lambda_1(G)geqcdotsgeqlambda_n(G)$. In this paper we find all simple graphs $G$ such that $G$ has at most twelve vertices and $G$ has exactly two non-negative eigenvalues. In other words ...