2022-05-20T14:28:14Z https://mir.kashanu.ac.ir/?_action=export&rf=summon&issue=14719
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 Numerical Calculation of Fractional Derivatives for the Sinc Functions via Legendre Polynomials Abbas Saadatmandi Ali Khani Mohammad Reza Azizi ‎This 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. Sinc functions‎ Fractional derivatives‎ ‎Collocation method‎ ‎caputo derivative‎ 2020 06 01 71 86 https://mir.kashanu.ac.ir/article_96936_06da74b6baa7fbe772ca4a6139f4606c.pdf
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 On L(d,1)-labelling of Trees Irena Hrastnik Janez Žerovnik Given a graph G and a positive integer d, an L(d,1)-labelling of G is a function f that assigns to each vertex of G a non-negative integer such that if two vertices u and v are adjacent, then |f(u)-f(v)|≥ d and if u and v are at distance two, then |f(u)-f(v)|≥ 1. The L(d,1)-number of G, λd(G), is the minimum m such that there is an L(d,1)-labelling of G with f(V)⊆ {0,1,… ,m}. A tree T is of type 1 if λd(T)= Δ +d-1 and is of type 2 if λd(T)≥ Δ+d. This paper provides sufficient conditions for λd(T)=Δ+d-1 generalizing the results of Wang  and Zhai, Lu, and Shu  for L(2,1)-labelling. L(d,1)-labelling tree Distance Δ-vertex 2020 06 01 87 102 https://mir.kashanu.ac.ir/article_108519_7a815e176ecf64051ff8ea4e1a552bac.pdf
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 The Zagreb Index of Bucket Recursive Trees Ramin Kazemi Ali Behtoei Akram Kohansal ‎Bucket 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. Bucket recursive tree‎ ‎the Zagreb index‎ Limiting rule‎ 2020 06 01 103 111 https://mir.kashanu.ac.ir/article_109509_f3b0cb23045fab361dda93a3b444fa84.pdf
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 Tension Reduction between Planck data and LSS by Dynamical Dark Energy Model Aghile Ebrahimi Majid Monemzadeh Hossein Moshafi Seyed Mohammad Sadegh Movahed In 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 σ8 and H0 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 H0 − Ωm and σ8 − Ωm 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.   Dynamical Dark Energy Models Tension Structure Formation 2020 06 01 113 130 https://mir.kashanu.ac.ir/article_110589_0d0bb4cabe5815f5d85dd91484d4b278.pdf
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 Toplogical and Geometric KM-Single Valued Neutrosophic Metric Spaces Mohammad Hamidi Mahdi Mollaei-Arani Yousef Alipour-Fakhri ‎This 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 spaces KM-single valued neutrosophic metric left-continuous triangular (co)norm Cauchy sequence 2020 06 01 131 155 https://mir.kashanu.ac.ir/article_110781_a0449f237421dc7bb3437d2ff15d7d16.pdf
2020-06-01 10.22052
Mathematics Interdisciplinary Research Math. Interdisc. Res. 2538-3639 2538-3639 2020 5 2 A New Efficient High Order Four-Step Multiderivative Method for the Numerical Solution of Second-Order IVPs with Oscillating Solutions Ali Shokri Mohammad Mehdizadeh Khalsaraei In 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. Phase-lag error Initial value problems P-stable Symmetric multistep methods Periodicity interval 2020 06 01 157 172 https://mir.kashanu.ac.ir/article_110786_a6223df3def795862c0f681d78805671.pdf