Bulletin of the Iranian Mathematical Society
text
article
2017
eng
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
http://bims.iranjournals.ir/article_1268_f3e714e90425ad0c50a7e73722850b9c.pdf
Existence of ground state solutions for a class of nonlinear elliptic equations with fast increasing weight
L.
Li
School of Mathematics and Statistics, Southwest University, Chongqing 400715, P.R. China and School of Mathematics and Statistics, Chongqing Technology | Business University, Chongqing 400067, P.R. China.
author
C.-L.
Tang
School of Mathematics and Statistics, Southwest University, Chongqing 400715, P.R. China.
author
text
article
2017
eng
This paper is devoted to get a ground state solution for a class of nonlinear elliptic equations with fast increasing weight. We apply the variational methods to prove the existence of ground state solution.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2111
2124
http://bims.iranjournals.ir/article_975_ecb7585b5b420bce9f6305db16fb169e.pdf
The ranks of the classes of $A_{10}$
A.B.M.
Basheer
School of Mathematical and Computer Sciences, University of Limpopo (Turfloop), P. Bag X1106, Sovenga 0727, South Africa.
author
text
article
2017
eng
Let $G $ be a finite group and $X$ be a conjugacy class of $G.$ The rank of $X$ in $G,$ denoted by $rank(G{:}X),$ is defined to be the minimal number of elements of $X$ generating $G.$ In this paper we establish the ranks of all the conjugacy classes of elements for simple alternating group $A_{10}$ using the structure constants method and other results established in [A.B.M. Basheer and J. Moori, On the ranks of the alternating group $A_{n}$, Bull. Malays. Math. Sci. Soc..
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2125
2135
http://bims.iranjournals.ir/article_1266_a66ae7592033b2fce476a115f015c8c9.pdf
$n$-Array Jacobson graphs
H.
Ghayour
erdowsi University of Mashhad, International Campus, Mashhad, Iran.
author
A.
Erfanian
Department of Pure Mathematics, Ferdowsi University of Mashhad, Mashhad, Iran.
author
A.
Azimi
Department of Mathematics, University of Neyshabur, P. O. Box 91136-899, Neyshabur, Iran.
author
M.
Farrokhi D. G.
Department of Pure Mathematics, Ferdowsi University of Mashhad, Mashhad, Iran.
author
text
article
2017
eng
We generalize the notion of Jacobson graphs into $n$-array columns called $n$-array Jacobson graphs and determine their connectivities and diameters. Also, we will study forbidden structures of these graphs and determine when an $n$-array Jacobson graph is planar, outer planar, projective, perfect or domination perfect.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2137
2152
http://bims.iranjournals.ir/article_1072_3d36aa6ead210c64097db60ede73c5ad.pdf
Inequalities for the polar derivative of a polynomial with $S$-fold zeros at the origin
E.
Khojastehnezhad
Department of Mathematics, University of Semnan, Semnan, Iran.
author
M.
Bidkham
Department of Mathematics, University of Semnan, Semnan, Iran.
author
text
article
2017
eng
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 if $p(z)$ has all its zeros in $|z| \leq k,\ (k\leq 1),$ with $s$-fold zeros at the origin then for every $\alpha\in\mathbb{C}$ with $|\alpha|\geq k$, \begin{align*} \max_{|z|=1}|D_{\alpha}p(z)|\geq \frac{(n+sk)(|\alpha|-k)}{1+k}\max_{|z|=1}|p(z)|. \end{align*} In this paper, we obtain a refinement of above inequality. Also as an application of our result, we extend some inequalities for polar derivative of a polynomial of degree $n$ which does not vanish in $|z|< k$, where $k\geq 1$, except $s$-fold zeros at the origin.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2153
2167
http://bims.iranjournals.ir/article_1087_e2275691daabd2435b3f62bfe31eedef.pdf
On $\Phi$-$\tau$-quasinormal subgroups of finite groups
Y.
Mao
Institute of Quantum Information Science, Shanxi Datong University
Datong 037009, P.R. China.
author
X.
Ma
School of Mathematics and Computer, University of Datong of Shanxi, Datong 037009, P.R. China.
author
X.
Tang
School of Mathematical Sciences, University of Science and Technology of China, Hefei, 230026, P.R. China.
author
J.
Huang
School of mathematics and statistics, Jiangsu Normal University
Xuzhou, 221116, P.R. China.
author
text
article
2017
eng
Let $\tau$ be a subgroup functor and $H$ a $p$-subgroup of a finite group $G$. Let $\bar{G}=G/H_{G}$ and $\bar{H}=H/H_{G}$. We say that $H$ is $\Phi$-$\tau$-quasinormal in $G$ if for some $S$-quasinormal subgroup $\bar{T}$ of $\bar{G}$ and some $\tau$-subgroup $\bar{S}$ of $\bar{G}$ contained in $\bar{H}$, $\bar{H}\bar{T}$ is $S$-quasinormal in $\bar{G}$ and $\bar{H}\cap\bar{T}\leq \bar{S}\Phi(\bar{H})$. In this paper, we study the structure of a group $G$ under the condition that some primary subgroups of $G$ are $\Phi$-$\tau$-quasinormal in $G$. Some new characterizations about $p$-nilpotency and solubility of finite groups are obtained.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2169
2182
http://bims.iranjournals.ir/article_1088_42c83e5c0a23d661fa95aaa1ad32dcfa.pdf
Linear codes with complementary duals related to the complement of the Higman-Sims graph
B.G.
Rodrigues
School of Mathematics, Statistics and Computer Science,
University of KwaZulu-Natal, Durban 4000, South Africa.
author
text
article
2017
eng
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 of $p=11$ the codes are those defined by the row span of the adjacency matrix of the complement of the Higman-Sims graph over $GF(3)$ and $GF(7).$ We show that these codes have a similar decoding performance to that of their binary counterparts obtained from the Higman-Sims graph. In particular, we show that these are linear codes with complementary duals, and thus meet the asymptotic Gilbert-Varshamov bound. Furthermore, using the codewords of weight 30 in $C_p(\overline{{\rm HiS}})$ we determine a subcode of codimension 1, and thus show that the permutation module of dimension 100 over the fields of 3, 7 and 11-elements, respectively is the direct sum of three absolutely irreducible modules of dimensions 1, 22 and 77. The latter being also the subdegrees of the orbit decomposition of the rank-3 representation.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2183
2204
http://bims.iranjournals.ir/article_1253_82f0207ea7f159c1fbcdbf2bda09cf56.pdf
Zero elements and $z$-ideals in modified pointfree topology
A.A.
Estaji
Faculty of Mathematics and Computer Sciences, Hakim Sabzevari University,
P.O. Box 397, Sabzevar, Iran.
author
A.
Karimi Feizabad
Department of Mathematics, Gorgan Branch, Islamic Azad University, Gorgan, Iran.
author
M.
Zarghani
Faculty of Mathematics and Computer Sciences, Hakim Sabzevari University,
P.O. Box 397, Sabzevar, Iran.
author
text
article
2017
eng
In this paper, we define and study the notion of zero elements in topoframes; a topoframe is a pair $(L, \tau)$, abbreviated $L_{ \tau}$, consisting of a frame $L$ and a subframe $ \tau $ all of whose elements are complemented elements in $L$. We show that the $f$-ring $ \mathcal{R}(L_\tau)$, the set of $\tau$-real continuous functions on $L$, is uniformly complete. Also, the set of all zero elements in a topoframe is closed under the formation of countable meets and finite joins. Also, we introduce the notion of $z$-filters and $z$-ideals in modified pointfree topology and make ready some results about them.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2205
2226
http://bims.iranjournals.ir/article_1090_17ec79f62279ac897d5fe7ebab2a0ff0.pdf
Modules whose direct summands are FI-extending
O.
Tasdemir
Department of Mathematics, Balkan Campus, Trakya University, 22030 Edirne, Turkey.
author
F.
Karabacak
Department of Mathematics, Yunus Emre Campus, Education Faculty, Anadolu University, 26470 Eskisehir, Turkey.
author
text
article
2017
eng
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 study, it is given some answers to the question that under what conditions a direct summand of an FI-extending module is an FI-extending module?
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2227
2231
http://bims.iranjournals.ir/article_1091_7994dad656774b761f268faf15e8955e.pdf
Duality for the class of a multiobjective problem with support functions under $K$-$G_f$-invexity assumptions
I.P.
Debnath
Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee 247 667, India.
author
S.K.
Gupta
Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee 247 667, India.
author
text
article
2017
eng
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 under $K$-$G_f$-invexity assumptions. Nontrivial examples have also been depicted to illustrate the theorems obtained in the paper. Results established in this paper unify and extend some previously known results appeared in the literature
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2233
2258
http://bims.iranjournals.ir/article_1096_85013b0bfd27489b5e154ca9baeafd3d.pdf
The $w$-FF property in trivial extensions
G.W.
Chang
Department of Mathematics Education,
Incheon National University, Incheon 22012,
Republic of Korea.
author
H.
Kim
School of Computer and Information Engineering, Hoseo University, Asan 31499,
Republic of Korea.
author
text
article
2017
eng
Let $D$ be an integral domain with quotient field $K$, $E$ be a $K$-vector space, $R = D \propto E$ be the trivial extension of $D$ by $E$, and $w$ be the so-called $w$-operation. In this paper, we show that $R$ is a $w$-FF ring if and only if $D$ is a $w$-FF domain; and in this case, each $w$-flat $w$-ideal of $R$ is $w$-invertible.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2259
2267
http://bims.iranjournals.ir/article_1095_d06f8dc061cfad739bf3eb28268245a3.pdf
Localization at prime ideals in bounded rings
E.
Akalan
Hacettepe University, Department of Mathematics, 06800 Beytepe, Ankara, Turkey.
author
B.
Saraç
Hacettepe University, Department of Mathematics, 06800 Beytepe, Ankara, Turkey.
author
text
article
2017
eng
In this paper we investigate the sufficiency criteria which guarantee the classical localization of a bounded ring at its prime ideals.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2269
2274
http://bims.iranjournals.ir/article_1098_c5be1040f7c106f382e2d16e3c9dd327.pdf
$L^p$ boundedness of the Bergman projection on some generalized Hartogs triangles
T.
Beberok
Sabanci University, Orta Mahalle, Universite Caddesi No: 27, Lojmanlari G7-102, Tuzla, 34956 Istanbul, Turkey.
author
text
article
2017
eng
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.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2275
2280
http://bims.iranjournals.ir/article_1102_c8f9b4afbe18af80c73696409cfed7fa.pdf
On the fixed number of graphs
I.
Javaid
Centre for advanced studies in Pure and Applied Mathematics,
Bahauddin Zakariya University Multan, Pakistan.
author
M.
Murtaza
Centre for advanced studies in Pure and Applied Mathematics,
Bahauddin Zakariya University Multan, Pakistan.
author
M.
Asif
Centre for advanced studies in Pure and Applied Mathematics,
Bahauddin Zakariya University Multan, Pakistan.
author
F.
Iftikhar
Centre for advanced studies in Pure and Applied Mathematics,
Bahauddin Zakariya University Multan, Pakistan.
author
text
article
2017
eng
A set of vertices $S$ of a graph $G$ is called a fixing set of $G$, if only the trivial automorphism of $G$ fixes every vertex in $S$. The fixing number of a graph is the smallest cardinality of a fixing set. The fixed number of a graph $G$ is the minimum $k$, such that every $k$-set of vertices of $G$ is a fixing set of $G$. A graph $G$ is called a $k$-fixed graph, if its fixing number and fixed number are both $k$. In this paper, we study the fixed number of a graph and give a construction of a graph of higher fixed number from a graph of lower fixed number. We find the bound on $k$ in terms of the diameter $d$ of a distance-transitive $k$-fixed graph.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2281
2292
http://bims.iranjournals.ir/article_1103_6cf076c09b16e5ab488956cbcfb99dc5.pdf
Filter theory in MTL-algebras based on Uni-soft property
G.
Muhiuddin
Department of Mathematics, University of Tabuk, Tabuk 71491, Saudi Arabia.
author
A.M.
Al-roqi
Department of Mathematics, King Abdulaziz University, P.O. Box 80203 Jeddah 21589, Saudi Arabia.
author
S.
Aldhafeeri
Department of Mathematics, College of basic education, Public authority for applied education and training, Kuwait.
author
text
article
2017
eng
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 sufficient) conditions for a uni-soft filter to be Boolean are provided. The condensational property for a Boolean uni-soft filter is established.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2293
2306
http://bims.iranjournals.ir/article_1104_0122114dd4208fd2c85fb7f526d0e470.pdf
Determination of a jump by Fourier and Fourier-Chebyshev series
M.
Avdispahic
University of Sarajevo, Deaprtment of Mathematics, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina.
author
Z.
Sabanac
University of Sarajevo, Deaprtment of Mathematics, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina.
author
text
article
2017
eng
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 class of functions of harmonic bounded variation. This is achieved without the finiteness assumption on the number of discontinuities. Two results on determination of jump discontinuities by means of the tails of integrated Fourier-Chebyshev series are also derived.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2307
2321
http://bims.iranjournals.ir/article_1107_f7490af1557c52224e87a714057dc4e6.pdf
Improved logarithmic-geometric mean inequality and its application
L.
Zou
School of Mathematics and Statistics, Chongqing Three Gorges University, Chongqing, 404100, P.R. China.
author
text
article
2017
eng
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.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2323
2326
http://bims.iranjournals.ir/article_1110_a2473c8ce3620a45bb9b80377280bcee.pdf
On rational groups with Sylow 2-subgroups of nilpotency class at most 2
S.
Jafari
Department of Mathematics, Faculty of Science, Shahed University, Tehran, Iran.
author
H.
Sharifi
Department of Mathematics, Faculty of Science, Shahed University, Tehran, Iran.
author
text
article
2017
eng
A finite group $G$ is called rational if all its irreducible complex characters are rational valued. In this paper we discuss about rational groups with Sylow 2-subgroups of nilpotency class at most 2 by imposing the solvability and nonsolvability assumption on $G$ and also via nilpotency and nonnilpotency assumption of $G$.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2327
2337
http://bims.iranjournals.ir/article_1113_58118f7c20f56a8f682e23695d8efc9e.pdf
Historic set carries full hausdorff dimension
G.-Z.
Ma
School of Mathematics and Statistics, Anyang Normal University, Henan, 455000, China.
author
text
article
2017
eng
We prove that the historic set for ratio of Birkhoff average is either empty or full of Hausdorff dimension in a class of one dimensional non-uniformly hyperbolic dynamical systems.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2339
2347
http://bims.iranjournals.ir/article_1115_1c9ffd5a7475a95dd5b010f5426739bf.pdf
On subgroups of topologized fundamental groups and generalized coverings
M.
Abdullahi Rashid
Department of Pure Mathematics, Center of Excellence in Analysis on Algebraic Structures, Ferdowsi University of Mashhad,
P.O.Box 1159-91775, Mashhad, Iran.
author
B.
Mashayekhy
Department of Pure Mathematics, Center of Excellence in Analysis on Algebraic Structures, Ferdowsi University of Mashhad,
P.O.Box 1159-91775, Mashhad, Iran.
author
H.
Torabi
Department of Pure Mathematics, Center of Excellence in Analysis on Algebraic Structures, Ferdowsi University of Mashhad,
P.O.Box 1159-91775, Mashhad, Iran.
author
S. Z.
Pashaei
Department of Pure Mathematics, Center of Excellence in Analysis on Algebraic Structures, Ferdowsi University of Mashhad,
P.O.Box 1159-91775, Mashhad, Iran.
author
text
article
2017
eng
In this paper, we are interested in studying subgroups of topologized fundamental groups and their influences on generalized covering maps.
More precisely, we find some relationships between generalized covering subgroups and the other famous subgroups of the fundamental group equipped with the compact-open topology and the whisker topology. Moreover, we present some conditions under which generalized coverings, semicoverings and coverings are equal.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2349
2370
http://bims.iranjournals.ir/article_1116_8152556e767eda520078c714dca68e25.pdf
Hölder continuity of a parametric variational inequality
X.F.
Hu
Department of Electronic Engineering,
Chongqing City Management College,
Chongqing, 401331, China.
author
X.B.
Li
College of Mathematics and Statistics, Chongqing Jiaotong University, Chongqing 400074, China.
author
text
article
2017
eng
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 gap function. Then under the strong monotonicity, we establish the Hölder continuity of the single-valued solution mapping for the problem. Finally, we apply these results to a traffic network equilibrium problem.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2371
2381
http://bims.iranjournals.ir/article_1120_3a0fbd1dd9a32d7853f443d5e6ca9ee8.pdf
Self-similar solutions of the Riemann problem for two-dimensional systems of conservation laws
S.
Ayad
Department of Mathematics, University of Oran1 Ahmed Ben Bella.
Laboratory of Fundamental and Applicable Analysis of Oran. BP 1524
El Menaouar, Oran, Algeria.
author
text
article
2017
eng
In this paper, a new approach is applied to study the self-similar solutions of 2×2 systems of nonlinear hyperbolic conservation laws. A notion of characteristic directions is introduced and then used to construct local and smooth solutions of the associated Riemann problem
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2383
2392
http://bims.iranjournals.ir/article_1121_26684545248f1df176c79bb1a94bf1c4.pdf
Existence and uniqueness of weak solutions for a class of nonlinear divergence type diffusion equations
P.
Chen
Department of Mathematics, Shanghai University, Shanghai 200444, China.
author
text
article
2017
eng
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 uniqueness of weak solutions of this problem.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2393
2410
http://bims.iranjournals.ir/article_1123_7319df9a4111d5ef1d112580fe279f75.pdf
Bounds for the dimension of the $c$-nilpotent multiplier of a pair of Lie algebras
H.
Arabyani
Department of Mathematics, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran.
author
text
article
2017
eng
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 uniqueness of weak solutions of this problem.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2411
2418
http://bims.iranjournals.ir/article_1126_77d79494191993b54fb703b7b2bb6ffd.pdf
Solving two-dimensional fractional integro-differential equations by Legendre wavelets
M.
Mojahedfar
Department of Mathematics, Shahed University, Tehran, Iran.
author
A.
Tari Marzabad
Department of Mathematics, Shahed University, Tehran, Iran.
author
text
article
2017
eng
In this paper, we introduce the two-dimensional Legendre wavelets (2D-LWs), and develop them for solving a class of two-dimensional integro-differential equations (2D-IDEs) of fractional order. We also investigate convergence of the method. Finally, we give some illustrative examples to demonstrate the validity and efficiency of the method.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2419
2435
http://bims.iranjournals.ir/article_1127_13f6e0db0fd1a7124eeba0587cc7fb54.pdf
Extensions of the Hestenes-Stiefel and Polak-Ribiere-Polyak conjugate gradient methods with sufficient descent property
S.
Babaie-Kafaki
Department of Mathematics, Faculty of Mathematics, Statistics and Computer Science, Semnan University, P.O. Box 35195--363, Semnan, Iran.
author
R.
Ghanbari
Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, P.O. Box: 9177948953, Mashhad, Iran.
author
text
article
2017
eng
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. The methods are shown to be globally convergent when the line search fulfills the (strong) Wolfe conditions. Numerical experiments are done on a set of CUTEr unconstrained optimization test problems. They demonstrate efficiency of the proposed methods in the sense of the Dolan-More performance profile.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2437
2448
http://bims.iranjournals.ir/article_1128_0b073c64c95e8808e5bc16015697853c.pdf
On a Picone's identity for the $\mathcal{A}_{p(x)}$-Laplacian and its applications
S.H.
Rasouli
Department of Mathematics, Faculty of Basic Sciences, Babol Noshirvani University of Technology, Babol, Iran.
author
text
article
2017
eng
We present a Picone's identity for the $\mathcal{A}_{p(x)}$-Laplacian, which is an extension of the classic identity for the ordinary Laplace. Also, some applications of our results in Sobolev spaces with variable exponent are suggested.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2449
2455
http://bims.iranjournals.ir/article_1137_05c4064c2f06bc59855a9bd882a9da8d.pdf
On the Noetherian dimension of Artinian modules with homogeneous uniserial dimension
A.R.
Alehafttan
Department of Mathematics, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
author
N.
Shirali
Department of Mathematics, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
author
text
article
2017
eng
In this article, we first show that non-Noetherian Artinian uniserial modules over commutative rings, duo rings, finite $R$-algebras and right Noetherian rings are $1$-atomic exactly like $\Bbb Z_{p^{\infty}}$. Consequently, we show that if $R$ is a right duo (or, a right Noetherian) ring, then the Noetherian dimension of an Artinian module with homogeneous uniserial dimension is less than or equal to $1$. In particular, if $A$ is a quotient finite dimensional $R$-module with homogeneous uniserial dimension, where $R$ is a locally Noetherian (or, a Noetherian duo) ring, then $n$-dim $A\leq 1$. We also show that the Krull dimension of Noetherian modules is bounded by the uniserial dimension of these modules. Moreover, we introduce the concept of qu-uniserial modules and by using this concept, we observe that if $A$ is an Artinian $R$-module, such that any of its submodules is qu-uniserial, where $R$ is a right duo (or, a right Noetherian) ring, then $n$-dim $A\leq 1$.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2457
2470
http://bims.iranjournals.ir/article_1146_2706ad754c4976e7ef148b92f0a82975.pdf
Distinguishing number and distinguishing index of natural and fractional powers of graphs
S.
Alikhani
Department of Mathematics, Yazd University, 89195-741, Yazd, Iran.
author
S.
Soltani
Department of Mathematics, Yazd University, Yazd, Iran.
author
text
article
2017
eng
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. For any $n \in \mathbb{N}$, the $n$-subdivision of $G$ is a simple graph $G^{\frac{1}{n}}$ which is constructed by replacing each edge of $G$ with a path of length $n$.
The $m^{th}$ power of $G$, is a graph with same set of vertices of $G$ and an edge between two vertices if and only if there is a path of length at most $m$ between them in $G$.
The fractional power of $G$, is the $m^{th}$ power of the $n$-subdivision of $G$, i.e., $(G^{\frac{1}{n}})^m$ or $n$-subdivision of $m$-th power of $G$, i.e., $(G^m)^{\frac{1}{n}}$. In this paper we study the distinguishing number and the distinguishing index of the natural and the fractional powers of $G$. We show that the natural powers more than one of a graph are distinguished by at most three edge labels. We also show that for a connected graph $G$ of order $n \geqslant 3$ with maximum degree $\Delta (G)$, and for $k\geqslant 2$, $D(G^{\frac{1}{k}})\leqslant \lceil \sqrt[k]{\Delta (G)} \rceil$. Finally we prove that for $m\geqslant 2$, the fractional power of $G$, i.e., $(G^{\frac{1}{k}})^m$ and $(G^m)^{\frac{1}{k}}$ are distinguished by at most three edge labels.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2471
2482
http://bims.iranjournals.ir/article_1148_6e91ca9abade6c5324063dfe5d00fcce.pdf
Characterization of $2\times 2$ full diversity space-time codes and inequivalent full rank spaces
H.
Momenaee Kermani
Department of Pure Mathematics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman, Kerman, Iran.
author
M.
Ashenab
Department of Pure Mathematics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman, Kerman, Iran | Young Researchers Society, Shahid Bahonar University of Kerman, Kerman, Iran.
author
text
article
2017
eng
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. In this paper, using the equivalent definition of full diversity space-time codes, we first characterize all real and complex $2\times 2$ rate one linear dispersion space-time block codes that are full diversity. This characterization is used to construct full diversity codes which are not derived from Alamouti scheme. Then, we apply our results to characterize all real subspaces of $M_{2}(\mathbb{C})$ and $M_{2}(\mathbb{R})$ whose nonzero elements are invertible. Finally, for any natural number $n>1$, we construct infinitely many inequivalent subspaces of $M_{n}(\mathbb{C})$ whose nonzero elements are invertible.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2483
2493
http://bims.iranjournals.ir/article_1174_53974d9400ee9e1f4349ffd74f245181.pdf
A characterization of orthogonality preserving operators
E.
Ansari-piri
Department of Mathematics, University of Guilan, P.O. Box 1914, Rasht, Iran.
author
R.G.
Sanati
Institute of Higher Education of ACECR(Academic Center of Education and Culture Research), Rasht branch, Iran.
author
M.
Kardel
Department of Mathematics, University Campus 2, University
of Guilan, P.O. Box 1914, Rasht, Iran |
(As a faculty member of (and supported by) Islamic Azad University, Zabol branch, Zabol, Iran. )
author
text
article
2017
eng
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 show that any circle (centered at the origin) is the spectrum of an orthogonality preserving operator. Also, we prove that every compact normal operator is a strongly orthogonality preserving operator.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2495
2505
http://bims.iranjournals.ir/article_1181_ac6e9a52abbf950860c93074399ab8f1.pdf
State spaces of $K_0$ groups of some rings
J.
Ren
Audio-visual Center, The Nanjing Institute of Tourism and Hospitality, 211100, Nanjing, P.R. China.
author
text
article
2017
eng
Let $R$ be a ring with the Jacobson radical $J(R)$ and let $\pi\colon R\to R/J(R)$ be the canonical map. Then $\pi$ induces an order preserving group homomorphism $K_0\pi\colon K_0(R)\to K_0(R/J(R))$ and an affine continuous map $S(K_0\pi)$ between the state space $St(R/J(R))$ and the state space $St(R).$ In this paper, we consider the natural affine map $S(K_0\pi).$ We give a condition under which $S(K_0\pi)$ is an affine homeomorphism. At the same time, we discuss the relationship between semilocal rings and semiperfect rings by using the affine map $S(K_0\pi).$
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2507
2516
http://bims.iranjournals.ir/article_1191_e3849a0b67ab727cb48a0154db42ba3d.pdf
Nonlinear Picone identities to Pseudo $p$-Laplace operator and applications
T.
Feng
Department of Applied Mathematics,
Northwestern Polytechnical University,
Xi'an, Shaanxi, 710072,
P.R. China.
author
M.
Yu
Department of Applied Mathematics,
Northwestern Polytechnical University,
Xi'an, Shaanxi, 710072,
P.R. China.
author
text
article
2017
eng
In this paper, we derive a nonlinear Picone identity to the pseudo p-Laplace operator, which contains some known Picone identities and removes a condition used in many previous papers. Some applications are given including a Liouville type theorem to the singular pseudo p-Laplace system, a Sturmian comparison principle to the pseudo p-Laplace equation, a new Hardy type inequality with weight and remainder term, a nonnegative estimate of the functional associated to pseudo p-Laplace equation.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2517
2530
http://bims.iranjournals.ir/article_1192_c065606badffd5fe4cb977c89c0de5c3.pdf
On the existence of Hilbert valued periodically correlated autoregressive processes
N.
Mohammadi Jouzdani
Department of Mathematical
Sciences, Isfahan University of Technology, Isfahan, Iran.
author
S.
Mahmoodi
Department of Mathematical Sciences, Isfahan
University of Technology, Isfahan, Iran.
author
A.
Parvardeh
Department of Statistics, Faculty of Sciences, University of
Isfahan, Isfahan, Iran.
author
text
article
2017
eng
In this paper we provide sufficient condition for existence of a unique Hilbert valued ($\mathbb{H}$-valued) periodically correlated solution to the first order autoregressive model $X_{n}=\rho _{n}X_{n-1}+Z_{n}$, for \ $n\in \mathbb{Z}$, and formulate the existing solution and its autocovariance operator. Also we specially investigate equivalent condition for the coordinate process $\left\langle X_{n},v\right\rangle $, for arbitrary element $v$ in $\mathbb{H}$, to satisfy in some autoregressive model. Finally, we extend our result to the autoregressive process with finite order.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2531
2545
http://bims.iranjournals.ir/article_1195_5daaf15f086281252ac083bc654b1cfc.pdf
Existence and convergence results for monotone nonexpansive type mappings in partially ordered hyperbolic metric spaces
R.
Shukla
Department of Mathematics, Visvesvaraya National Institute of Technology, Nagpur 440010, India.
author
R.
Pant
Department of Mathematics, Visvesvaraya National Institute of Technology, Nagpur 440010, India.
author
Z.
Kadelburg
Faculty of Mathematics, University of Belgrade, Studentski trg 16/IV, 11000 Beograd, Serbia.
author
H.
Nashine
Department of Mathematics, Texas A & M University, Kingsville, 78363-8202, Texas, USA.
author
text
article
2017
eng
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.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2547
2565
http://bims.iranjournals.ir/article_1199_90b19cca8a330576f9bb4f3ff79cf8b8.pdf
Characterization of finite $p$-groups by the order of their Schur multipliers ($t(G)=7$)
S.H.
Jafari
Department of Mathematics, Mashhad branch, Islamic Azad University, Mashhad, Iran
author
text
article
2017
eng
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 groups $G$ is already known for $t(G)\leq 6$. This paper extends the classification to $t(G)=7$.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2567
2576
http://bims.iranjournals.ir/article_1206_4a5ae568dd14e6cf4e4e5dfe4687c965.pdf
An extension of the Wedderburn-Artin Theorem
H.
Khabazian
Department of Mathematical Science, Isfahan University of Technology, Isfahan, Iran.
author
text
article
2017
eng
In this paper we give conditions under which a ring is isomorphic to a structural matrix ring over a division ring.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2577
2583
http://bims.iranjournals.ir/article_1212_69f07f5026eb8ed76cc9168a2248eb14.pdf
Recurrences and explicit formulae for the expansion and connection coefficients in series of the product of two classical discrete orthogonal polynomials
H.M.
Ahmed
Department of Mathematics, Faculty of Industrial Education, Helwan
University, Cairo-Egypt |
Department of Mathematics, Faculty of Sciences, Saqraa University,
Shaqraa-KSA.
author
text
article
2017
eng
Suppose that for an arbitrary function $f(x,y)$ of two discrete variables, we have the formal expansions. [f(x,y)=sumlimits_{m,n=0}^{infty }a_{m,n},P_{m}(x)P_{n}(y),] $$ x^{m}P_{j}(x)=\sum\limits_{n=0}^{2m}a_{m,\,n}(j)P_{j+m-n}(x),$$ we find the coefficients $b_{i,j}^{(p,q,\ell ,\,r)}$ in the expansion $$ x^{\ell }y^{r}\,\nabla _{x}^{p}\nabla _{y}^{q}\,f(x,y)=x^{\ell }y^{r}f^{(p,q)}(x,y) =\sum\limits_{m,n=0}^{\infty }a_{m,n}^{(p,q)}\,P_{m}(x)P_{n}(y),\,\,a_{m,n}^{(0,0)}=a_{m,n},$$ We give applications of these results in solving partial difference equations with varying polynomial coefficients, by reducing them to recurrence relations (difference equations) in the expansion coefficients of the solution.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2585
2615
http://bims.iranjournals.ir/article_1213_131b7669ec7a41ec353661475728792f.pdf
Limits in modified categories of interest
K.
Emir
Department of Mathematics and Computer Science, Eskişehir Osmangazi University, Turkey.
author
S.
Çetin
Department of Mathematics, Mehmet Akif Ersoy University, Burdur, Turkey.
author
text
article
2017
eng
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 diagrams with extra structures on certain arrows. These constructions unify many corresponding results for the cases of groups, commutative algebras and can also be adapted to various algebraic structures.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2617
2634
http://bims.iranjournals.ir/article_1222_e14591523a7f710c9325a6fd421f7fec.pdf
Self-similar fractals and arithmetic dynamics
A.
Rastegar
Sharif University of Technology,Tehran, Iran |
Institute for Advanced Study, Princeton, USA.
author
text
article
2017
eng
The concept of self-similarity on subsets of algebraic varieties is defined by considering algebraic endomorphisms of the variety as `similarity' maps. Self-similar fractals are subsets of algebraic varieties which can be written as a finite and disjoint union of `similar' copies. Fractals provide a framework in which, one can unite some results and conjectures in Diophantine geometry. We define a well-behaved notion of dimension for self-similar fractals. We also prove a fractal version of Roth's theorem for algebraic points on a variety approximated by elements of a fractal subset. As a consequence, we get a fractal version of Siegel's theorem on finiteness of integral points on hyperbolic curves and a fractal version of Faltings' theorem on Diophantine approximation on abelian varieties.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2635
2653
http://bims.iranjournals.ir/article_1246_b52e1ad99d6abc9c4958a326107bd224.pdf
Perturbation bounds for $g$-inverses with respect to the unitarily invariant norm
L.
Meng
College of Mathematics and Statistics, Northwest Normal University, Lanzhou 730070, P.R. China.
author
text
article
2017
eng
Let complex matrices $A$ and $B$ have the same sizes. Using the singular value decomposition, we characterize the $g$-inverse $B^{(1)}$ of $B$ such that the distance between a given $g$-inverse of $A$ and the set of all $g$-inverses of the matrix $B$ reaches minimum under the unitarily invariant norm. With this result, we derive additive and multiplicative perturbation bounds of the nearest perturbed $g$-inverse. These results generalize and improve the existing results published recently to some extent.
Bulletin of the Iranian Mathematical Society
Iranian Mathematical Society (IMS)
1017-060X
43
v.
7
no.
2017
2655
2662
http://bims.iranjournals.ir/article_1256_48f9f6287f956af831c7368cb1ae09b4.pdf