Volume 4, Issue 1

 

ارسال های اخیر

  • SIGNED ROMAN DOMINATION NUMBER AND JOIN OF GRAPHS 

    Behtoei, A.؛ Vatandoost, E.؛ Azizi Rajol Abad, F. (Shahrood University of Technology, 2016-09-01)
    In this paper we study the signed Roman dominationnumber of the join of graphs. Specially, we determine it for thejoin of cycles, wheels, fans and friendship graphs.

  • STRONGLY DUO AND CO-MULTIPLICATION MODULES 

    Safaeeyan, S. (Shahrood University of Technology, 2016-09-01)
    Let R be a commutative ring. An R-module M is called co-multiplication provided that foreach submodule N of M there exists an ideal I of R such that N = (0 : I). In this paper weshow that co-multiplication ...

  • ON RELATIVE CENTRAL EXTENSIONS AND COVERING PAIRS 

    Pourmirzaei, A.؛ Hassanzadeh, M.؛ Mashayekhy, B. (Shahrood University of Technology, 2016-09-01)
    Let (G;N) be a pair of groups. In this article, first we con-struct a relative central extension for the pair (G;N) such that specialtypes of covering pair of (G;N) are homomorphic image of it. Second, we

  • ON FINITE GROUPS IN WHICH SS-SEMIPERMUTABILITY IS A TRANSITIVE RELATION 

    Mirdamadi, S.E.؛ Rezaeezadeh, Gh.R (Shahrood University of Technology, 2016-09-01)
    Let H be a subgroup of a finite group G. We say that H is SS-semipermutable in Gif H has a supplement K in G such that H permutes with every Sylow subgroup X of Kwith (jXj; jHj) = 1. In this paper, the Structure ...

  • ON COMPOSITION FACTORS OF A GROUP WITH THE SAME PRIME GRAPH AS Ln(5) 

    Mahmoudifar, A. (Shahrood University of Technology, 2016-09-01)
    The prime graph of a finite group $G$ is denoted by$ga(G)$. A nonabelian simple group $G$ is called quasirecognizable by primegraph, if for every finite group $H$, where $ga(H)=ga(G)$, thereexists a ...

  • SOME REMARKS ON GENERALIZATIONS OF MULTIPLICATIVELY CLOSED SUBSETS 

    Ebrahimpour, M. (Shahrood University of Technology, 2016-09-01)
    Let R be a commutative ring with identity and Mbe a unitary R-module. In this paper we generalize the conceptmultiplicatively closed subset of R and we study some propertiesof these genaralized subsets ...