International Journal of Mathematics and Mathematical Sciences The latest articles from Hindawi Publishing Corporation © 2015 , Hindawi Publishing Corporation . All rights reserved. A Note on Isomorphism Theorems for Semigroups of Order-Preserving Transformations with Restricted Range Thu, 19 Feb 2015 06:54:50 +0000 Finding necessary and sufficient conditions for isomorphism between two semigroups of order-preserving transformations over an infinite domain with restricted range was an open problem. In this paper, we show a proof strategy to answer that question. Phichet Jitjankarn and Thitarie Rungratgasame Copyright © 2015 Phichet Jitjankarn and Thitarie Rungratgasame. All rights reserved. Solving the Linear 1D Thermoelasticity Equations with Pure Delay Wed, 04 Feb 2015 08:24:20 +0000 We propose a system of partial differential equations with a single constant delay describing the behavior of a one-dimensional thermoelastic solid occupying a bounded interval of . For an initial-boundary value problem associated with this system, we prove a well-posedness result in a certain topology under appropriate regularity conditions on the data. Further, we show the solution of our delayed model to converge to the solution of the classical equations of thermoelasticity as . Finally, we deduce an explicit solution representation for the delay problem. Denys Ya. Khusainov and Michael Pokojovy Copyright © 2015 Denys Ya. Khusainov and Michael Pokojovy. All rights reserved. Extended Matrix Variate Hypergeometric Functions and Matrix Variate Distributions Tue, 20 Jan 2015 06:51:55 +0000 Hypergeometric functions of matrix arguments occur frequently in multivariate statistical analysis. In this paper, we define and study extended forms of Gauss and confluent hypergeometric functions of matrix arguments and show that they occur naturally in statistical distribution theory. Daya K. Nagar, Raúl Alejandro Morán-Vásquez, and Arjun K. Gupta Copyright © 2015 Daya K. Nagar et al. All rights reserved. Common Fixed Points of Locally Contractive Mappings in Multiplicative Metric Spaces with Application Mon, 12 Jan 2015 12:03:30 +0000 The aim of this paper is to present common fixed point results of quasi-weak commutative mappings on a closed ball in the framework of multiplicative metric spaces. Example is presented to support the result proved herein. We also study sufficient conditions for the existence of a common solution of multiplicative boundary value problem. Our results extend and improve various recent results in the existing literature. Mujahid Abbas, Bashir Ali, and Yusuf I. Suleiman Copyright © 2015 Mujahid Abbas et al. All rights reserved. Retracted: Some Properties of Fuzzy Quasimetric Spaces Thu, 08 Jan 2015 11:14:40 +0000 International Journal of Mathematics and Mathematical Sciences Copyright © 2015 International Journal of Mathematics and Mathematical Sciences. All rights reserved. On the Projective Description of Weighted (LF)-Spaces of Continuous Functions Wed, 19 Nov 2014 00:00:00 +0000 We solve the problem of the topological or algebraic description of countable inductive limits of weighted Fréchet spaces of continuous functions on a cone. This problem is investigated for two families of weights defined by positively homogeneous functions. Weights of this form play the important role in Fourier analysis. Catherine V. Komarchuk and Sergej N. Melikhov Copyright © 2014 Catherine V. Komarchuk and Sergej N. Melikhov. All rights reserved. Complexity-Based Modeling of Scientific Capital: An Outline of Mathematical Theory Thu, 30 Oct 2014 11:17:56 +0000 The paper intends to contribute to a better understanding of the phenomenon of scientific capital. Scientific capital is a well-known concept for measuring and assessing the accumulated recognition and the specific scientific power. The concept of scientific capital developed by Bourdieu is used in international social science research to explain a set of scholarly properties and practices. Mathematical modeling is applied as a lens through which the scientific capital is addressed. The principal contribution of this paper is an axiomatic characterization of scientific capital in terms of natural axioms. The application of the axiomatic method to scientific capital reveals novel insights into problem still not covered by mathematical modeling. Proposed model embraces the interrelations between separate sociological variables, providing a unified sociological view of science. Suggested microvariational principle is based upon postulate, which affirms that (under suitable conditions) the observed state of the agent in scientific field maximizes scientific capital. Its value can be roughly imagined as a volume of social differences. According to the considered macrovariational principle, the actual state of scientific field makes so-called energy functional (which is associated with the distribution of scientific capital) minimal. Yurij L. Katchanov and Natalia A. Shmatko Copyright © 2014 Yurij L. Katchanov and Natalia A. Shmatko. All rights reserved. Some Condition for Scalar and Vector Measure Games to Be Lipschitz Wed, 01 Oct 2014 07:53:11 +0000 We provide a characterization for vector measure games in , with vector of nonatomic probability measures, analogous to the one of Tauman for games in , and also provide a necessary and sufficient condition for a particular class of vector measure games to belong to . F. Centrone and A. Martellotti Copyright © 2014 F. Centrone and A. Martellotti. All rights reserved. Erratum to “The Real and Complex Hermitian Solutions to a System of Quaternion Matrix Equations with Applications” Tue, 30 Sep 2014 12:14:47 +0000 Shao-Wen Yu Copyright © 2014 Shao-Wen Yu. All rights reserved. On Maps of Period 2 on Prime and Semiprime Rings Mon, 22 Sep 2014 08:47:39 +0000 A map f of the ring R into itself is of period 2 if for all ; involutions are much studied examples. We present some commutativity results for semiprime and prime rings with involution, and we study the existence of derivations and generalized derivations of period 2 on prime and semiprime rings. H. E. Bell and M. N. Daif Copyright © 2014 H. E. Bell and M. N. Daif. All rights reserved. When an Extension of Nagata Rings Has Only Finitely Many Intermediate Rings, Each of Those Is a Nagata Ring Tue, 02 Sep 2014 11:24:08 +0000 Let be an extension of commutative rings, with X an indeterminate, such that the extension of Nagata rings has FIP (i.e., has only finitely many -subalgebras). Then, the number of -subalgebras of equals the number of R-subalgebras of S. In fact, the function from the set of R-subalgebras of S to the set of -subalgebras of given by is an order-isomorphism. David E. Dobbs, Gabriel Picavet, and Martine Picavet-L’Hermitte Copyright © 2014 David E. Dobbs et al. All rights reserved. Interest of Boundary Kernel Density Techniques in Evaluating an Approximation Error of Queueing Systems Characteristics Thu, 14 Aug 2014 09:06:09 +0000 We show the interest of nonparametric methods taking into account the boundary correction techniques for a numerical evaluation of an approximation error between the stationary distributions of and queueing systems, when the density function of the general arrivals law in the system is unknown and defined on a bounded support. To compute this error, we use two kinds of norms: the norm and the weight norm. Numerical examples based on simulation studies are presented for the two cases of considered norms. A comparative study of the results has been provided. Aïcha Bareche and Djamil Aïssani Copyright © 2014 Aïcha Bareche and Djamil Aïssani. All rights reserved. Solving Fuzzy Multiproduct Aggregate Production Planning Problems Based on Extension Principle Sun, 03 Aug 2014 10:42:36 +0000 Aggregate production planning (APP) plays a critical role in supply chain management (SCM). This paper investigates multiproduct, multiperiod APP problems with several distinct types of fuzzy uncertainties. In contrast to the existing studies, the modelling in this work conserves the fuzziness such that the obtained APP is more effective. Based on Zadeh’s extension principle, the results obtained are fuzzy solutions described by membership functions, in contrast to results from previous studies. A pair of two-level parametric mathematical programs is formulated to calculate the lower and upper bounds of the optimum fuzzy performance measure. The membership function of the fuzzy total cost is constructed by enumerating various possibility levels. A case studied in previous research is investigated to demonstrate the validity of the proposed model and solution procedure. Because the optimal objective value and associated decision variables are expressed using fuzzy numbers rather than crisp values, the proposed approach is able to represent APP systems more accurately, and therefore, the results obtained can provide decision makers with more effective and informative APPs and more chance to achieve the optimal disaggregate plan. Shih-Pin Chen and Wen-Lung Huang Copyright © 2014 Shih-Pin Chen and Wen-Lung Huang. All rights reserved. On Harmonic Functions Defined by Differential Operator with Respect to -Symmetric Points Wed, 23 Jul 2014 08:25:04 +0000 We introduce new classes and of harmonic univalent functions with respect to -symmetric points defined by differential operator. We determine a sufficient coefficient condition, representation theorem, and distortion theorem. Afaf A. Ali Abubaker and Maslina Darus Copyright © 2014 Afaf A. Ali Abubaker and Maslina Darus. All rights reserved. Haar Wavelet Operational Matrix Method for Fractional Oscillation Equations Tue, 15 Jul 2014 13:11:05 +0000 We utilized the Haar wavelet operational matrix method for fractional order nonlinear oscillation equations and find the solutions of fractional order force-free and forced Duffing-Van der Pol oscillator and higher order fractional Duffing equation on large intervals. The results are compared with the results obtained by the other technique and with exact solution. Umer Saeed and Mujeeb ur Rehman Copyright © 2014 Umer Saeed and Mujeeb ur Rehman. All rights reserved. Applying GG-Convex Function to Hermite-Hadamard Inequalities Involving Hadamard Fractional Integrals Mon, 14 Jul 2014 11:21:04 +0000 By virtue of fractional integral identities, incomplete beta function, useful series, and inequalities, we apply the concept of GG-convex function to derive new type Hermite-Hadamard inequalities involving Hadamard fractional integrals. Finally, some applications to special means of real numbers are demonstrated. Zhi Zhang, JinRong Wang, and JianHua Deng Copyright © 2014 Zhi Zhang et al. All rights reserved. Proof of Some Conjectures of Melham Using Ramanujan's Formula Thu, 10 Jul 2014 12:10:06 +0000 We employ Ramanujan's formula to prove three conjectures of R. S. Melham on representation of an integer as sums of polygonal numbers. Bipul Kumar Sarmah Copyright © 2014 Bipul Kumar Sarmah. All rights reserved. Some Properties of Certain Class of Analytic Functions Thu, 10 Jul 2014 08:39:39 +0000 We obtain some properties related to the coefficient bounds for certain subclass of analytic functions. We also work on the differential subordination for a certain class of functions. Uzoamaka A. Ezeafulukwe and Maslina Darus Copyright © 2014 Uzoamaka A. Ezeafulukwe and Maslina Darus. All rights reserved. A Study of Cho-Kwon-Srivastava Operator with Applications to Generalized Hypergeometric Functions Wed, 09 Jul 2014 08:04:19 +0000 We introduce a new class of meromorphically analytic functions, which is defined by means of a Hadamard product (or convolution) involving some suitably normalized meromorphically functions related to Cho-Kwon-Srivastava operator. A characterization property giving the coefficient bounds is obtained for this class of functions. The other related properties, which are investigated in this paper, include distortion and the radii of starlikeness and convexity. We also consider several applications of our main results to generalized hypergeometric functions. F. Ghanim and M. Darus Copyright © 2014 F. Ghanim and M. Darus. All rights reserved. A Note on the Warmth of Random Graphs with Given Expected Degrees Mon, 30 Jun 2014 11:27:36 +0000 We consider the random graph model for a given expected degree sequence . Warmth, introduced by Brightwell and Winkler in the context of combinatorial statistical mechanics, is a graph parameter related to lower bounds of chromatic number. We present new upper and lower bounds on warmth of . In particular, the minimum expected degree turns out to be an upper bound of warmth when it tends to infinity and the maximum expected degree with . Yilun Shang Copyright © 2014 Yilun Shang. All rights reserved. New Expansion Formulas for a Family of the -Generalized Hurwitz-Lerch Zeta Functions Thu, 26 Jun 2014 08:47:32 +0000 We derive several new expansion formulas for a new family of the λ-generalized Hurwitz-Lerch zeta functions which were introduced by Srivastava (2014). These expansion formulas are obtained by making use of some important fractional calculus theorems such as the generalized Leibniz rules, the Taylor-like expansions in terms of different functions, and the generalized chain rule. Several (known or new) special cases are also considered. H. M. Srivastava and Sébastien Gaboury Copyright © 2014 H. M. Srivastava and Sébastien Gaboury. All rights reserved. Folding Theory Applied to Residuated Lattices Wed, 25 Jun 2014 11:04:56 +0000 Residuated lattices play an important role in the study of fuzzy logic based on -norms. In this paper, we introduce some notions of -fold filters in residuated lattices, study the relations among them, and compare them with prime, maximal and primary, filters. This work generalizes existing results in BL-algebras and residuated lattices, most notably the works of Lele et al., Motamed et al., Haveski et al., Borzooei et al., Van Gasse et al., Kondo et al., Turunen et al., and Borumand Saeid et al., we draw diagrams summarizing the relations between different types of -fold filters and -fold residuated lattices. Albert Kadji, Celestin Lele, Jean B. Nganou, and Marcel Tonga Copyright © 2014 Albert Kadji et al. All rights reserved. Optimal Manufacturing-Remanufacturing Production Policy for a Closed-Loop Supply Chain under Fill Rate and Budget Constraint in Bifuzzy Environments Tue, 24 Jun 2014 12:16:32 +0000 We study a closed-loop supply chain involving a manufacturing facility and a remanufacturing facility. The manufacturer satisfies stochastic market demand by remanufacturing the used product into “as-new” one and producing new products from raw material in the remanufacturing facility and the manufacturing facility, respectively. The remanufacturing cost depends on the quality of used product. The problem is maximizing the manufacturer’s expected profit by jointly determining the collected quantity of used product and the ordered quantity of raw material. Following that we analyze the model with a fill rate constraint and a budget constraint separately and then with both the constraints. Next, to handle the imprecise nature of some parameters of the model, we develop the model with both constraints in bifuzzy environment. Finally numerical examples are presented to illustrate the models. The sensitivity analysis is also conducted to generate managerial insight. Soumita Kundu, Tripti Chakrabarti, and Dipak Kumar Jana Copyright © 2014 Soumita Kundu et al. All rights reserved. Legendre Wavelet Operational Matrix Method for Solution of Riccati Differential Equation Tue, 24 Jun 2014 00:00:00 +0000 A Legendre wavelet operational matrix method (LWM) is presented for the solution of nonlinear fractional-order Riccati differential equations, having variety of applications in quantum chemistry and quantum mechanics. The fractional-order Riccati differential equations converted into a system of algebraic equations using Legendre wavelet operational matrix. Solutions given by the proposed scheme are more accurate and reliable and they are compared with recently developed numerical, analytical, and stochastic approaches. Comparison shows that the proposed LWM approach has a greater performance and less computational effort for getting accurate solutions. Further existence and uniqueness of the proposed problem are given and moreover the condition of convergence is verified. S. Balaji Copyright © 2014 S. Balaji. All rights reserved. On Some New Hermite-Hadamard Type Inequalities for s-Geometrically Convex Functions Thu, 19 Jun 2014 15:50:20 +0000 Some new integral inequalities of Hermite-Hadamard type related to the s-geometrically convex functions are established and some applications to special means of positive real numbers are also given. İmdat İşcan Copyright © 2014 İmdat İşcan. All rights reserved. Modified Decomposition Method with New Inverse Differential Operators for Solving Singular Nonlinear IVPs in First- and Second-Order PDEs Arising in Fluid Mechanics Thu, 19 Jun 2014 05:23:42 +0000 Singular nonlinear initial-value problems (IVPs) in first-order and second-order partial differential equations (PDEs) arising in fluid mechanics are semianalytically solved. To achieve this, the modified decomposition method (MDM) is used in conjunction with some new inverse differential operators. In other words, new inverse differential operators are developed for the MDM and used with the MDM to solve first- and second-order singular nonlinear PDEs. The results of the solutions by the MDM together with new inverse operators are compared with the existing exact analytical solutions. The comparisons show excellent agreement. Nemat Dalir Copyright © 2014 Nemat Dalir. All rights reserved. Inversion Free Algorithms for Computing the Principal Square Root of a Matrix Wed, 18 Jun 2014 08:15:46 +0000 New algorithms are presented about the principal square root of an matrix . In particular, all the classical iterative algorithms require matrix inversion at every iteration. The proposed inversion free iterative algorithms are based on the Schulz iteration or the Bernoulli substitution as a special case of the continuous time Riccati equation. It is certified that the proposed algorithms are equivalent to the classical Newton method. An inversion free algebraic method, which is based on applying the Bernoulli substitution to a special case of the continuous time Riccati equation, is also proposed. Nicholas Assimakis and Maria Adam Copyright © 2014 Nicholas Assimakis and Maria Adam. All rights reserved. On the Equivalence of B-Rigidity and C-Rigidity for Quasitoric Manifolds Sun, 15 Jun 2014 00:00:00 +0000 For quasitoric manifolds and moment-angle complexes which are central objects recently much studied in toric topology, there are several important notions of rigidity formulated in terms of cohomology rings. The aim of this paper is to show that, among other things, Buchstaber-rigidity (or B-rigidity) is equivalent to cohomological-rigidity (or C-rigidity) for simple convex polytopes supporting quasitoric manifolds. Jin Hong Kim Copyright © 2014 Jin Hong Kim. All rights reserved. Some New Transformation Properties of the Nielsen Generalized Polylogarithm Thu, 12 Jun 2014 11:18:22 +0000 Many of the properties of Nielsen generalized polylogarithm , for example, the special value and the transformation formulas, play important roles in the computation of higher order radiative corrections in quantum electrodynamics. In this paper, some transformation formulas of , and are obtained. In particular, the last three transformation formulas are new results so far in the literature. By use of these transformation formulas presented, new fast algorithms for Nielsen generalized polylogarithm can be designed. For , a new recurrence formula is also given. The identities and the calculation of and are also investigated. Nina Shang, Qinghua Feng, and Huizeng Qin Copyright © 2014 Nina Shang et al. All rights reserved. Somewhat Slightly Generalized Double Fuzzy Semicontinuous Functions Thu, 12 Jun 2014 09:33:51 +0000 The aim of this paper is to introduce the concepts of somewhat slightly generalized double fuzzy semicontinuous functions and somewhat slightly generalized double fuzzy semiopen functions in double fuzzy topological spaces. Some interesting properties and characterizations of these functions are introduced and discussed. Furthermore, the relationships among the new concepts are discussed with some necessary examples. Fatimah M. Mohammed, M. S. M. Noorani, and A. Ghareeb Copyright © 2014 Fatimah M. Mohammed et al. All rights reserved.