Volume 39, Issue 5

 

ارسال های اخیر

  • G-positive and G-repositive solutions to some adjointable operator equations over Hilbert C^{∗}-modules 

    Song, G. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    Some necessary and sufficient conditions are given for the existence of a G-positive (G-repositive) solution to adjointable operator equations $AX=C,AXA^{left( astright) }=C$ and $AXB=C$ over Hilbert

  • Biflatness of certain semigroup algebras 

    Essmaili, M.؛ Medghalchi, A. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    In the present paper, we consider biflatness of certain classes of semigroupalgebras. Indeed, we give a necessary condition for a band semigroup algebra to bebiflat and show that this condition is ...

  • Limit distribution of the degrees in scaled attachment random recursive trees 

    Javanian, M. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    We study the limiting distribution of the degree of a given node in a scaled attachment random recursive tree, a generalized random recursive tree, which is introduced by Devroye et. al (2011). In a scaled ...

  • Tutte polynomials of wheels via generating functions 

    Brennan, C.؛ Mansour, T.؛ Mphako-Banda, E. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    We find an explicit expression of the Tutte polynomial of an $n$-fan. We also find a formula of the Tutte polynomial of an $n$-wheel in terms of the Tutte polynomial of $n$-fans. Finally, we give an alternative expression ...

  • Applications of Epi-Retractable and Co-Epi-Retractable Modules 

    Mostafanasab, H. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    A module M is called epi-retractable if every submodule of M is a homomorphic image of M. Dually, a module M is called co-epi-retractable if it contains a copy of each of its factor modules. In special case, a ring ...

  • POS-groups with some cyclic Sylow subgroups 

    Shen, R.؛ Shi, W. J.؛ Shi, J. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    A finite group G is said to be a POS-group if for each x in G the cardinality of the set {y in G | o(y) = o(x)} is a divisor of the order of G. In this paper we study the structure of POS-groups with some cyclic ...

  • On Generalization of prime submodules 

    Ebrahimpour, M.؛ Nekooei, R. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    Let R be a commutative ring with identity and M be a unitary R-module. Let : S(M) −! S(M) [ {;} be a function, where S(M) is the set of submodules ofM. Suppose n 2 is a positive integer. A proper submodule ...

  • Generalized numerical ranges of matrix polynomials 

    Aghamollaei, G.؛ Avizeh, N.؛ Jahanshahi, Y. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    In this paper, we introduce the notions of C-numerical range and C-spectrum of matrix polynomials. Some algebraic and geometrical properties are investigated. We also study the relationship between the C-numerical ...

  • A new proof for the Banach-Zarecki theorem: A light on integrability and continuity 

    Mahdipour Shirayeh, A.؛ Eshraghi, H. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    To demonstrate more visibly the close relation between thecontinuity and integrability, a new proof for the Banach-Zareckitheorem is presented on the basis of the Radon-Nikodym theoremwhich emphasizes on ...

  • Analytic solutions for the Stephen's inverse problem with local boundary conditions including Elliptic and hyperbolic equations 

    Jahanshahi, M.؛ Sajjadmanesh, M. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    In this paper, two inverse problems of Stephen kind with local (Dirichlet) boundary conditions are investigated. In the first problem only a part of boundary is unknown and in the second problem, the whole of boundary is ...

  • Some combinatorial aspects of finite Hamiltonian groups 

    Tarnauceanu, M. (Springer and the Iranian Mathematical Society (IMS), 2013-10-01)
    In this paper we provide explicit formulas for the number of elements/subgroups/cyclic subgroups of a given order and for the total number of subgroups/cyclic subgroups in a finite Hamiltonian group. The coverings with ...