University of KashanMathematics Interdisciplinary Research2538-36395220200601Numerical Calculation of Fractional Derivatives for the Sinc Functions via Legendre Polynomials71869693610.22052/mir.2018.96632.1074ENAbbasSaadatmandiDepartment of Applied Mathematics, Faculty of Mathematical Sciences, University of Kashan, Kashan, Iran0000-0002-7744-7770AliKhaniDepartment of Mathematics, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz, IranMohammad RezaAziziDepartment of Mathematics, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz, IranJournal Article20170827This paper provides the fractional derivatives of the Caputo type for the sinc functions. It allows to use efficient numerical method for solving fractional differential equations. At first, some properties of the sinc functions and Legendre polynomials required for our subsequent development are given. Then we use the Legendre polynomials to approximate the fractional derivatives of sinc functions. Some numerical examples are introduced to demonstrate the reliability and effectiveness of the introduced method.University of KashanMathematics Interdisciplinary Research2538-36395220200601On L(d,1)-labelling of Trees8710210851910.22052/mir.2020.227370.1211ENIrenaHrastnikFaculty of Mechanical Engineering,
University of Maribor,
Maribor, SloveniaJanezŽerovnikFaculty of Mechanical Engineering,
University of Ljubljana,
Ljubljana, SloveniaJournal Article20200417Given a graph <em>G</em> and a positive integer <em>d</em>, an L(<em>d</em>,1)-labelling of <em>G</em> is a function <em>f</em> that assigns to each vertex of <em>G</em> a non-negative integer such that if two vertices u and v are adjacent, then |<em>f</em>(<em>u</em>)-<em>f</em>(<em>v</em>)|≥ <em>d</em> and if <em>u</em> and <em>v</em> are at distance two, then |<em>f</em>(<em>u</em>)-<em>f</em>(<em>v</em>)|≥ 1. The L(<em>d</em>,1)-number of <em>G</em>, <em>λ<sub>d</sub></em>(<em>G</em>), is the minimum <em>m</em> such that there is an L(<em>d</em>,1)-labelling of <em>G</em> with <em>f</em>(<em>V</em>)⊆ {0,1,… ,<em>m</em>}. A tree T is of type 1 if <em>λ<sub>d</sub></em>(<em>T</em>)= Δ +<em>d</em>-1 and is of type 2 if λ<sub>d</sub>(<em>T</em>)≥ Δ+<em>d</em>. This paper provides sufficient conditions for λ<sub>d</sub>(<em>T</em>)=Δ+<em>d</em>-1 generalizing the results of Wang [11] and Zhai, Lu, and Shu [12] for L(2,1)-labelling.University of KashanMathematics Interdisciplinary Research2538-36395220200601The Zagreb Index of Bucket Recursive Trees10311110950910.22052/mir.2020.204312.1166ENRaminKazemiDepartment of Statistics, Imam Khomeini International University, Qazvin, I. R. IranAliBehtoeiDepartment of Pure Mathematics, Imam Khomeini International University, Qazvin, I. R. IranAkramKohansalDepartment of Statistics, Imam Khomeini International University, Qazvin, I. R. Iranhttps://orcid.org/0000-0002-1894-411XJournal Article20191007Bucket recursive trees are an interesting and natural generalization of recursive trees. In this model the nodes are buckets that can hold up to b≥ 1 labels. The (modified) Zagreb index of a graph is defined as the sum of the squares of the outdegrees of all vertices in the graph. We give the mean and variance of this index in random bucket recursive trees. Also, two limiting results on this index are given.University of KashanMathematics Interdisciplinary Research2538-36395220200601Tension Reduction between Planck data and LSS by Dynamical Dark Energy Model11313011058910.22052/mir.2019.176929.1127ENAghileEbrahimiDepartment of Physics, University of Kashan,Kashan, I. R. IranMajidMonemzadehDepartment of Physics, University of Kashan,Kashan, I. R. IranHosseinMoshafiIbn-Sina Laboratory, Shahid Beheshti University, Velenjak, Tehran 19839, IranSeyed Mohammad SadeghMovahedDepartment of Physics, Shahid Beheshti University, Velenjak, Tehran 19839, IranJournal Article20190324In this paper, we consider the dynamical dark energy model (Feng model) to reveal the discrepancy between CMB and LSS data raised by ΛCDM model. In order to constrained free parameters, we utilize two combined sets namely the Planck TT 2015+Pol+BAO and the WL+RSD. We find that, there is a tension between the best fit values for both σ<sub>8</sub> and H<sub>0</sub> derived by the early and late time observations in the context of ΛCDM model, while the mentioned discrepancy is alleviated in the Feng model. Two dimensional likelihood analysis demonstrate that including dynamical dark energy model alleviates H<sub>0</sub> − Ω<sub>m</sub> and σ<sub>8</sub> − Ω<sub>m</sub> tension from 2σ to 1σ confidence level compared to that of given for ΛCDM. Besides these, the models satisfy fσ8 data in 0 < z < 0.4 redshift bin but for z > 0.4, the models behave differently rather than data for both data sets.<br /> <br /> University of KashanMathematics Interdisciplinary Research2538-36395220200601Toplogical and Geometric KM-Single Valued Neutrosophic Metric Spaces13115511078110.22052/mir.2020.227202.1209ENMohammadHamidiDepartment of Mathematics, University of Payame Noor, Tehran, IranMahdiMollaei-AraniDepartment of Mathematics, University of Payame Noor, Tehran, IranYousefAlipour-FakhriDepartment of Mathematics, University of Payame Noor, Tehran, IranJournal Article20200415This paper introduces the novel concept of KM-single valued neutrosophic metric spaces as an especial generalization of KM-fuzzy metric spaces, investigates several topological and structural properties and presents some of its applications. This study also considers the metric spaces and constructs KM-single valued neutrosophic spaces with respect to any given triangular norms and triangular conorms. Moreover, we try to extend the concept of KM-single valued neutrosophic metric spaces to a larger class of KM-single valued neutrosophic metric spaces such as union of KM-single valued neutrosophic metric spaces and product of KM-single valued neutrosophic metric spacesUniversity of KashanMathematics Interdisciplinary Research2538-36395220200601A New Efficient High Order Four-Step Multiderivative Method for the Numerical Solution of Second-Order IVPs with Oscillating Solutions15717211078610.22052/mir.2020.211603.1185ENAliShokriFaculty of Mathematical Science, University of Maragheh, Maragheh, I. R. Iran0000-0003-2699-1490MohammadMehdizadeh KhalsaraeiFaculty of Mathematical Science, University of Maragheh, Maragheh, I. R. IranJournal Article20191212In this paper, we present a new high order explicit four-step method of eighth algebraic order for solving second-order linear periodic and oscillatory initial value problems of ordinary differential equations such as undamped Duffing's equation. Numerical stability and phase properties of the new method is analyzed. The main structure of the method is multiderivative, and the combined phases were applied to expand the stability interval and to achieve P-stability. The advantage of the method in comparison with similar methods in terms of efficiency, accuracy, and stability is shown by its implementation in some well-known problems.