Iranian Journal of Mathematical Sciences and Informatics
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Iranian Journal of Mathematical Sciences and Informatics - Journal articles for year 2012, Volume 7, Number 2Yektaweb Collection - http://www.yektaweb.comen2012/11/11The Common Neighborhood Graph and Its Energy
http://ijmsi.ir/browse.php?a_id=349&sid=1&slc_lang=en
<p>Let $G$ be a simple graph with vertex set ${v_1,v_2,ldots,v_n}$. The common neighborhood graph (congraph) of $G$, denoted by $con(G)$, is the graph with vertex set ${v_1,v_2,ldots,v_n}$, in which two vertices are adjacent if and only they have at least one common neighbor in the graph $G$. The basic properties of $con(G)$ and of its energy are established.</p>
Anwar AlwardiUniform Boundedness Principle for operators on hypervector spaces
http://ijmsi.ir/browse.php?a_id=350&sid=1&slc_lang=en
<p>The aim of this paper is to prove the Uniform Boundedness Principle and Banach-Steinhaus Theorem for anti linear operators and hence strong linear operators on Banach hypervector spaces. Also we prove the continuity of the product operation in such spaces.</p>
Ali TaghaviCanonical (m,n)−ary hypermodules over Krasner (m,n)−ary hyperrings
http://ijmsi.ir/browse.php?a_id=351&sid=1&slc_lang=en
<p>The aim of this research work is to define and characterize a new class of n-ary multialgebra that may be called canonical (m, n)&minus hypermodules. These are a generalization of canonical n-ary hypergroups, that is a generalization of hypermodules in the sense of canonical and a subclasses of (m, n)&minusary hypermodules. In addition, three isomorphism theorems of module theory and canonical hypermodule theory are derived in the context of canonical (m, n)-hypermodules.</p>
S. M. AnvariyehEffects of Slip and Heat Transfer on MHD Peristaltic Flow in An Inclined Asymmetric Channel
http://ijmsi.ir/browse.php?a_id=352&sid=1&slc_lang=en
<p>Peristaltic transport of an incompressible electrically conducting viscous fluid in an inclined planar asymmetric channel is studied. The asymmetry is produced by choosing the peristaltic wave train on the walls to have different amplitude and phase. The closed form solutions of momentum and energy equation in presence of viscous dissipation term are obtained for long wave length and low Reynolds number approximations. The effects of different parameters entering into the problem are discussed numerically and explained graphically.</p>
Kalidas Dasz-weak ideals and prime weak ideals
http://ijmsi.ir/browse.php?a_id=354&sid=1&slc_lang=en
<p>In this paper, we study a generalization of z-ideals in the ring C(X) of continuous real valued functions on a completely regular Hausdorff space X. The notion of a weak ideal and naturally a weak z-ideal and a prime weak ideal are introduced and it turns out that they behave such as z-ideals in C(X).</p>
Ali Akbar EstajiThe differential transform method for solving the model describing biological species living together
http://ijmsi.ir/browse.php?a_id=355&sid=1&slc_lang=en
<p>F. Shakeri and M. Dehghan in [13] presented the variational iteration method for solving the model describing biological species living together. Here we suggest the differential transform (DT) method for finding the numerical solution of this problem. To this end, we give some preliminary results of the DT and by proving some theorems, we show that the DT method can be easily applied to mentioned problem. Finally several test problems are solved and compared with variational iteration method.</p>
A. TariOmega Polynomial in Polybenzene Multi Tori
http://ijmsi.ir/browse.php?a_id=356&sid=1&slc_lang=en
<p>The polybenzene units BTX 48, X=A (armchair) and X=Z (zig-zag) dimerize forming “eclipsed” isomers, the oligomers of which form structures of five-fold symmetry, called multi-tori. Multi-tori can be designed by appropriate map operations. The genus of multi-tori was calculated from the number of tetrapodal units they consist. A description, in terms of Omega polynomial, of the two linearly periodic BTX-networks was also presented.</p>
Mircea V. DiudeaWEAKLY g(x)-CLEAN RINGS
http://ijmsi.ir/browse.php?a_id=353&sid=1&slc_lang=en
<p>A ring $R$ with identity is called ``clean'' if $~$for every element $ain R$, there exist an idempotent $e$ and a unit $u$ in $R$ such that $a=u+e$. Let $C(R)$ denote the center of a ring $R$ and $g(x)$ be a polynomial in $C(R)[x]$. An element $rin R$ is called ``g(x)-clean'' if $r=u+s$ where $g(s)=0$ and $u$ is a unit of $R$ and, $R$ is $g(x)$-clean if every element is $g(x)$-clean. In this paper we define a ring to be weakly $g(x)$-clean if each element of $R$ can be written as either the sum or difference of a unit and a root of $g(x)$.</p>
Nahid AshrafiThe best uniform polynomial approximation of two classes of rational functions
http://ijmsi.ir/browse.php?a_id=357&sid=1&slc_lang=en
<p>In this paper we obtain the explicit form of the best uniform polynomial approximations out of Pn of two classes of rational functions using properties of Chebyshev polynomials. In this way we present some new theorems and lemmas. Some examples will be given to support the results.</p>
M. R. Eslahchi