مرور Volume 43, Issue 7 بر اساس عنوان

در حال نمایش موارد 1 - 20 از 34

  • Bounds for the dimension of the $c$-nilpotent multiplier of a pair of Lie algebras 

    Arabyani, H. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper‎, ‎we study the Neumann boundary value problem of a class of nonlinear divergence type diffusion equations‎. ‎By a priori estimates‎, ‎difference and variation techniques‎, ‎we establish the existence and ...

  • Characterization of $2times 2$ full diversity space-time codes and inequivalent full rank spaces 

    Momenaee Kermani, H.؛ Ashenab, M. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In wireless communication systems‎, ‎space-time codes are applied to encode data when multiple antennas are used in the receiver and transmitter‎. ‎The concept of diversity is very crucial in designing space-time codes‎. ...

  • Characterization of finite $p$-groups by the order of their Schur multipliers ($t(G)=7$) 

    Jafari, S.H. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎Let $G$ be a finite $p$-group of order $p^n$ and‎ ‎$|{mathcal M}(G)|=p^{frac{1}{2}n(n-1)-t(G)}$‎, ‎where ${mathcal M}(G)$‎ ‎is the Schur multiplier of $G$ and $t(G)$ is a nonnegative integer‎. ‎The classification of such ...

  • A characterization of orthogonality preserving operators 

    Ansari-piri, E.؛ Sanati, R.G.؛ Kardel, M. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper‎, ‎we characterize the class of orthogonality preserving operators on an infinite-dimensional Hilbert space $H$ as scalar multiples of unitary operators between $H$ and some closed subspaces of $H$‎. ‎We ...

  • Determination of a jump by Fourier and Fourier-Chebyshev series 

    Avdispahic, M.؛ Sabanac, Z. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎By observing the equivalence of assertions on determining the jump of a‎ ‎function by its differentiated or integrated Fourier series‎, ‎we generalize a‎ ‎previous result of Kvernadze‎, ‎Hagstrom and Shapiro to the whole ...

  • Distinguishing number and distinguishing index of natural and fractional powers of graphs 

    Alikhani, S.؛ Soltani, S. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎The distinguishing number (resp. index) $D(G)$ ($D'(G)$) of a graph $G$ is the least integer $d$‎ ‎such that $G$ has an vertex labeling (resp. edge labeling) with $d$ labels that is preserved only by a trivial‎ ‎automorphism‎. ...

  • Duality for the class of a multiobjective problem with support functions under $K$-$G_f$-invexity assumptions 

    Debnath, I.P.؛ Gupta, S.K. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this article‎, ‎we formulate two dual models Wolfe and Mond-Weir related to symmetric nondifferentiable multiobjective programming problems‎. ‎Furthermore‎, ‎weak‎, ‎strong and converse duality results are established ...

  • Existence and convergence results for monotone nonexpansive type mappings in‎ ‎partially ordered hyperbolic metric spaces 

    Shukla, R.؛ Pant, R.؛ Kadelburg, Z.؛ Nashine, H. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎We present some existence and convergence results for a general class of nonexpansive mappings in partially ordered hyperbolic metric spaces‎. ‎We also give some examples to show the generality of the mappings considered herein.

  • Existence and uniqueness of weak solutions for a class of nonlinear divergence type diffusion equations 

    Chen, P. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper‎, ‎we study the Neumann boundary value problem of a class of nonlinear divergence type diffusion equations‎. ‎By a priori estimates‎, ‎difference and variation techniques‎, ‎we establish the existence and ...

  • An extension of the Wedderburn-Artin Theorem 

    Khabazian, H. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper we give conditions under which a ring is isomorphic to a structural matrix ring over a division ring.

  • Extensions of the Hestenes-Stiefel and Polak-Ribiere-Polyak conjugate gradient methods with sufficient descent property 

    Babaie-Kafaki, S.؛ Ghanbari, R. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    Using search directions of a recent class of three--term conjugate gradient methods, modified versions of the Hestenes-Stiefel and Polak-Ribiere-Polyak methods are proposed which satisfy the sufficient descent condition. ...

  • Filter theory in MTL-algebras based on Uni-soft property 

    Muhiuddin, G.؛ Al-roqi, A.M.؛ Aldhafeeri, S. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎The notion of (Boolean) uni-soft filters‎ ‎in MTL-algebras is introduced‎, ‎and several properties of them are‎ ‎investigated‎. ‎Characterizations of (Boolean) uni-soft filters are discussed‎, ‎and some (necessary and ...

  • Hölder continuity of a parametric variational inequality 

    Hu, X.F.؛ Li, X.B. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper‎, ‎we study the Hölder continuity of solution mapping to a parametric variational inequality‎. ‎At first‎, ‎recalling a real-valued gap function of the problem‎, ‎we discuss the Lipschitz continuity of the ...

  • Improved logarithmic-geometric mean inequality and its application 

    Zou, L. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    In this short note, we present a refinement of the logarithmic-geometric mean inequality. As an application of our result, we obtain an operator inequality associated with geometric and logarithmic means.

  • Inequalities for the polar derivative of a polynomial with $S$-fold zeros at the origin 

    Khojastehnezhad, E.؛ Bidkham, M. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎Let $p(z)$ be a polynomial of degree $n$ and for a complex number $alpha$‎, ‎let $D_{alpha}p(z)=np(z)+(alpha-z)p'(z)$ denote the polar derivative of the polynomial p(z) with respect to $alpha$‎. ‎Dewan et al proved‎ ‎that ...

  • $L^p$ boundedness of the Bergman projection on some generalized Hartogs triangles 

    Beberok, T. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper we investigate a two classes of domains in $mathbb{C}^n$ generalizing the Hartogs triangle‎. ‎We prove optimal estimates for the mapping properties of the Bergman projection on these domains.

  • Limits in modified categories of interest 

    Emir, K.؛ Çetin, S. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎We firstly prove the completeness of the category of crossed modules in a modified category of interest‎. ‎Afterwards‎, ‎we define pullback crossed modules and pullback cat objects that are both obtained by pullback ...

  • Linear codes with complementary duals related to the complement of the Higman-Sims graph 

    Rodrigues, B.G. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎In this paper we study codes $C_p(overline{{rm HiS}})$ where $p =3,7‎, ‎11$ defined by the 3‎- ‎7‎- ‎and 11-modular representations of the simple sporadic group ${rm HS}$ of Higman and Sims of degree 100‎. ‎With exception ...

  • Localization at prime ideals in bounded rings 

    Akalan, E.؛ Saraç, B. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    In this paper we investigate the sufficiency criteria which guarantee the classical localization of a bounded ring at its prime ideals.

  • Modules whose direct summands are FI-extending 

    Tasdemir, O.؛ Karabacak, F. (Springer and the Iranian Mathematical Society (IMS), 2017-12-01)
    ‎A module $M$ is called FI-extending if every fully invariant submodule of $M$ is essential in a direct summand of $M$‎. ‎It is not known whether a direct summand of an FI-extending module is also FI-extending‎. ‎In this ...