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
(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
(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 ($t(G)=7$)
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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 ...



