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 1Yektaweb Collection - http://www.yektaweb.comen2012/5/12On C3-Like Finsler Metrics
http://ijmsi.ir/browse.php?a_id=283&sid=1&slc_lang=en
<p>In this paper, we study the class of of C3-like Finsler metrics which contains the class of semi-C-reducible Finsler metric. We find a condition on C3-like metrics under which the notions of Landsberg curvature and mean Landsberg curvature are equivalent.</p>
A. TayebiF-Permutations induce Some Graphs and Matrices
http://ijmsi.ir/browse.php?a_id=284&sid=1&slc_lang=en
<p>In this paper, by using the notion of fuzzy subsets, the concept of F-permutation is introduced. Then by applying this notion the concepts of presentation of an F-polygroup, graph of an F-permutation and F-permutation matrices are investigated.</p>
A. HasankhaniCommon Fixed Points and Invariant Approximations for Cq-commuting Generalized nonexpansive mappings
http://ijmsi.ir/browse.php?a_id=285&sid=1&slc_lang=en
<p>Some common fixed point theorems for Cq-commuting generalized nonexpansive mappings have been proved in metric spaces. As applications, invariant approximation results are also obtained. The results proved in the paper extend and generalize several known results including those of M. Abbas and J.K. Kim [Bull. Korean Math. Soc. 44(2007) 537-545], I. Beg, N. Shahzad and M. Iqbal [Approx. Theory Appl. 8(1992) 97-105], W.G. Dotson [J. London Math. Soc. 4(1972) 408-410 Proc. Amer. Math. Soc. 38(1973) 155-156.], M. D. Guay, K. L. Singh and J. H. M. Whitfield [Proc. Conference on nonlinear analysis (Ed. S.P.Singh and J. H. Bury) Marcel Dekker 80(1982) 179-189], L. Habiniak [J. Approx. Theory 56(1989) 241-244], N. Hussain and B.E. Rhoades [Fixed Point Theory Appl. Vol. 2006, Article ID 24543, 1-9], T.D. Narang and S. Chandok [Indian J. Math. 51(2009) 293-303 Ukrainian Math. J. 62 (2010) 1367-1376], N. Shahzad [Fixed point Theory Appl. 1(2005) 79-86] and of Y. Song [Comm. Math. Anal. 2(2007) 17-26].</p>
Sumit ChandokConstructing Finite Frames via Platonic Solids
http://ijmsi.ir/browse.php?a_id=286&sid=1&slc_lang=en
<p>Finite tight frames have many applications and some interesting physical interpretations. One of the important subjects in this area is the ways for constructing such frames. In this article we give a concrete method for constructing finite normalized frames using Platonic solids.</p>
Ahmad SafapourStability and numerical solution of time variant linear systems with delay in both the state and control
http://ijmsi.ir/browse.php?a_id=294&sid=1&slc_lang=en
<p>In this paper, stability for uncertain time variant linear systems with time delay is studied. A new sufficient condition for delay-dependent systems is given in matrix inequality form which depends on the range of delay. Then, we introduce a new direct computational method to solve delay systems. This method consists of reducing the delay problem to a set of algebraic equations by first expanding the candidate function as hybrid functions with unknown coefficients. By using collocation method, the coefficients of the hybrid functions are obtained. Some numerical examples are given to illustrate and compare our results with other existing methods in the literature.</p>
Salameh SedaghatR-parts in hyperrings
http://ijmsi.ir/browse.php?a_id=287&sid=1&slc_lang=en
<p>In this article, first we generalize the concept of complete parts in hyperrings by introducing the concept R-parts in hyperrings and then we study R-closures in hyperrings. Finally we characterize R-closures in hyperfields.</p>
H. BabaeiA Note on Tensor Product of Graphs
http://ijmsi.ir/browse.php?a_id=288&sid=1&slc_lang=en
<p>Let $G$ and $H$ be graphs. The tensor product $Gotimes H$ of $G$ and $H$ has vertex set $V(Gotimes H)=V(G)times V(H)$ and edge set $E(Gotimes H)={(a,b)(c,d)| acin E(G):: and:: bdin E(H)}$. In this paper, some results on this product are obtained by which it is possible to compute the Wiener and Hyper Wiener indices of $K_n otimes G$.</p>
Sirous MoradiNew results on p-Carleson measures and some related measures in the unit disk
http://ijmsi.ir/browse.php?a_id=292&sid=1&slc_lang=en
<p>We provide some new sharp embeddings for p-Carleson measures and some related measures in the unit disk of the complex plane.</p>
Romi ShamoyanCharacterizations of the simple group $D_{n}(3)$ by prime graph and spectrum
http://ijmsi.ir/browse.php?a_id=306&sid=1&slc_lang=en
<p>We prove that $D_n(3)$, where $ngeq6$ is even, is uniquely determined by its prime graph. Also, if $G$ is a finite group with the same prime graph as $D_4(3)$, then $Gcong D_4(3), B_3(3), C_3(3)$ or $G/O_2(G)cong {rm Aut}({}^2B_2(8))$.</p>
M. Foroudi Ghasemabadi