Iranian Journal of Mathematical Sciences and Informatics
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Iranian Journal of Mathematical Sciences and Informatics - Journal articles for year 2008, Volume 3, Number 2Yektaweb Collection - https://yektaweb.comen2008/11/11The explicit relation among the edge versions of detour index
http://ijmsi.ir/browse.php?a_id=47&sid=1&slc_lang=en
<p>The vertex version of detour index was defined during the works on connected graph in chemistry. The edge versions of detour index have been introduced ecently. In this paper, the explicit relations among edge versions of detour index have been declared and due to these relations, we compute the edge detour indices for some well-known graphs.</p>
A. Mahmiani Application of He’s homotopy perturbation method for Schrodinger equation
http://ijmsi.ir/browse.php?a_id=51&sid=1&slc_lang=en
<p>In this paper, He’s homotopy perturbation method is applied to solve linear Schrodinger equation. The method yields solutions in convergent series forms with easily computable terms. The result show that these method is very convenient and can be applied to large class of problems. Some numerical examples are given to effectiveness of the method.</p>
B. Jazbi On Two Methods for Computing the Non-Rigid Group of Molecules
http://ijmsi.ir/browse.php?a_id=53&sid=1&slc_lang=en
<p>In this paper, two methods are described, by means of which it is possible to calculate the non rigid group of molecules consisting of a number of XH3 groups attached to a rigid framework. The first method is a combination of the wreath product formalism of Balasubramanian and modern computer algebra and the second method is a computational approach by using group theory package GAP. We apply these methods on 2,3,6,7,10,11-hexanitrotriphenylene (HNT) to compute its non-rigid group.</p>
A. Iranmanesh Some result on simple hyper K-algebras
http://ijmsi.ir/browse.php?a_id=54&sid=1&slc_lang=en
<p>A simple method is described, to prove some theorems for simple hyper K-algebras and to study positive implicative hyper K-ideals, weak (implicative ) hyper K-ideals in simple hyper K-algebras . Beside, some results on positive implicative and (weak) implicative simple hyper K-algebras are presented. Finally classification of simple hyper Kalgebras of order 4, which are satisfied in conditions of Theorem 3.29, is going to be calculated .</p>
T. Roudbari Quasi-Exact Sequence and Finitely Presented Modules
http://ijmsi.ir/browse.php?a_id=48&sid=1&slc_lang=en
<p>The notion of quasi-exact sequence of modules was introduced by B. Davvaz and coauthors in 1999 as a generalization of the notion of exact sequence. In this paper we investigate further this notion. In particular, some interesting results concerning this concept and torsion functor are given.</p>
A. Madanshekaf The Polynomials of a Graph
http://ijmsi.ir/browse.php?a_id=50&sid=1&slc_lang=en
<p>In this paper, we are presented a formula for the polynomial of a graph. Our main result is the following formula: [Sum (d{_u}(k))]=[Sum (a{_kj}{S{_G}^j}(1))], where, u is an element of V(G) and 1<=j<=k.</p>
S. Sedghi Median and Center of Zero-Divisor Graph of Commutative Semigroups
http://ijmsi.ir/browse.php?a_id=52&sid=1&slc_lang=en
<p>For a commutative semigroup S with 0, the zero-divisor graph of S denoted by &Gamma(S) is the graph whose vertices are nonzero zero-divisor of S, and two vertices x, y are adjacent in case xy = 0 in S. In this paper we study median and center of this graph. Also we show that if Ass(S) has more than two elements, then the girth of &Gamma(S) is three.</p>
H. R. Maimani Superminimal fibres in an almost contact metric submersion
http://ijmsi.ir/browse.php?a_id=49&sid=1&slc_lang=en
<p>The superminimality of the fibres of an almost contact metric submersion is used to study the integrability of the horizontal distribution and the structure of the total space.</p>
T. Tshikuna-Matamba