Volume 38, Issue 2
مرور بر اساس
ارسال های اخیر
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Some homological properties of amalgamated duplication of a ring along an ideal
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In this work, we investigate the transfer of some homological properties from a ring $R$ to its amalgamated duplication along some ideal $I$ of $R$ $Rbowtie I$, and then generate new and original families ...
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A note on the socle of certain types of f-rings
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)For any reduced commutative $f$-ring with identity and bounded inversion, we show that a condition which is obviously necessary for the socle of the ring to coincide with the socle of its bounded part, ...
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Ring structures of mod p equivariant cohomology rings and ring homomorphisms between them
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In this paper, we consider a class of connected oriented (with respect to Z/p) closed G-manifolds with a non-empty finite fixed point set, each of which is G-equivariantly formal, where G = Z/p and p is an odd prime. Using ...
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Optimal order finite element approximation for a hyperbolic integro-differential equation
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Semidiscrete finite element approximation of a hyperbolic type integro-differential equation is studied. The model problem is treated as the wave equation which is perturbed with a memory term.
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Riordan group approaches in matrix factorizations
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In this paper, we consider an arbitrary binary polynomial sequence {A_n} and then give a lower triangular matrix representation of this sequence. As main result, we obtain a factorization of the in nite generalized Pascal ...
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On Rickart modules
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Let $R$ be an arbitrary ring with identity and $M$ a right $R$-module with $S=$ End$_R(M)$. The module $M$ is called {it Rickart} if for any $fin S$, $r_M(f)=Se$ for some $e^2=ein S$. We prove that some ...
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Properties of multivalent functions associated with certain integral operator
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Let A(p) denote the class of functions which are analytic in the open unit disk U. By making use of certain integral operator,we obtain some interesting properties of multivalent analytic functions.
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Some vector fields on a riemannian manifold with semi-symmetric metric connection
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In the first part of this paper, some theorems are given for a Riemannian manifold with semi-symmetric metric connection. In the second part of it, some special vector fields, for example, torse-forming vector fields, ...
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Applications of epi-retractable modules
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)An R-module M is called epi-retractable if every submodule of MR is a homomorphic image of M. It is shown that if R is a right perfect ring, then every projective slightly compressible module MR is epi-retractable. If R ...
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An iterative method for amenable semigroup and infinite family of non expansive mappings in Hilbert spaces
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)begin{abstract} In this paper, we introduce an iterative method for amenable semigroup of non expansive mappings and infinite family of non expansive mappings in the frame work of Hilbert spaces. We prove ...
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Invariance of the barycentric subdivision of a simplicial complex
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In this paper we prove that a simplicial complex is determined uniquely up to isomorphism by its barycentric subdivision as well as its comparability graph. We also put together several algebraic,
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Finite p-groups with few non-linear irreducible character kernels
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Abstract. In this paper, we classify all of the finite p-groups with at most three non linear irreducible character kernels.
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Projective maximal submodules of extending regular modules
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)We show that a projective maximal submodule of afinitely generated, regular, extending module is a directsummand. Hence, every finitely generated, regular, extendingmodule with projective maximal submodules ...
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Recurrent metrics in the geometry of second order differential equations
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Given a pair (semispray $S$, metric $g$) on a tangent bundle, the family of nonlinear connections $N$ such that $g$ is recurrent with respect to $(S, N)$ with a fixed recurrent factor is determined by ...
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A new family in the stable homotopy groups of spheres
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Let $p$ be a prime number greater than three. In this paper, we prove the existence of a new family of homotopy elements in the stable homotopy groups of spheres $pi_{ast}(S)$ which is represented by ...
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Branches in random recursive k-ary trees
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)In this paper, using generalized {polya} urn models we find the expected value of the size of a branch in recursive $k$-ary trees. We also find the expectation of the number of nodes of a given outdegree ...
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Comparison results on the preconditioned mixed-type splitting iterative method for M-matrix linear systems
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Consider the linear system Ax=b where the coefficient matrix A is an M-matrix. In the present work, it is proved that the rate of convergence of the Gauss-Seidel method is faster than the mixed-type ...
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Horvitz-Thompson estimator of population mean under inverse sampling designs
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Inverse sampling design is generally considered to be appropriate technique when the population is divided into two subpopulations, one of which contains only few units. In this paper, we derive the Horvitz-Thompson estimator ...
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Common fixed points of f-weak contractions in cone metric spaces
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Recently, Choudhury and Metiya [Fixed points of weak contractions in cone metric spaces, Nonlinear Analysis 72 (2010) 1589-1593] proved some fixed point theorems for weak contractions in cone metric spaces. ...
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Rings with a setwise polynomial-like condition
(Springer and the Iranian Mathematical Society (IMS), 2012-07-01)Let $R$ be an infinite ring. Here we prove that if $0_R$ belongs to ${x_1x_2cdots x_n ;|; x_1,x_2,dots,x_nin X}$ for every infinite subset $X$ of $R$, then $R$ satisfies the polynomial identity $x^n=0$. ...



