University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Linear System of Equations with Doubly Stochastic Interval Coefficient Matrix 1 7 2813 10.22080/cjms.2020.19114.1530 EN Azim Rivaz Department of Applied Mathematics, Shahid Bahonar University of Kerman, Kerman, Iran Somayeh Zangoei Zadeh Department of Applied Mathematics, Shahid Bahonar University of Kerman, Kerman, Iran Journal Article 2020 06 22 ‎In this paper‎, ‎we first give an overview of doubly stochastic interval matrices‎. ‎Then‎, ‎we present some theories about the interval linear system whose coefficient matrix is doubly stochastic interval matrix‎. ‎Also‎, ‎we give an outer estimation for the solution set of these systems‎. http://cjms.journals.umz.ac.ir/article_2813_e44b3158df5b38c997f1fee5cf52597b.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Strongly hollow elements in the lattices 8 17 3278 10.22080/cjms.2021.20373.1563 EN Shahabaddin Ebrahimi Atani Department of Mathematics, University of Guilan, P.O.Box 1914, Rasht, Iran. Mehdi Khoramdel Department of Mathematics, University of Guilan, P.O.Box 1914, Rasht, Iran. Saboura Dolati Pish Hesari Department of Mathematics, University of Guilan, P.O.Box 1914, Rasht, Iran. Mahsa Nikmard Rostam Alipour Department of Mathematics, University of Guilan, P.O.Box 1914, Rasht, Iran. Journal Article 2020 11 28 Let \$L\$ be a lattice with the greatest element 1. Following the concept of strongly hollow elements of commutative rings, we define strongly hollow elements of lattices and we will make an intensive investigate the basic properties and possible structures of these elements. http://cjms.journals.umz.ac.ir/article_3278_319635c17b6b05b0459a10cc859abc7b.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Berezin number inequalities involving superquadratic functions 18 27 2379 10.22080/cjms.2019.17427.1434 EN Mehmet Gurdal Suleyman Demirel University, Isparta, Turkey 0000-0003-0866-1869 Nazan Duman Suleyman Demirel University, Isparta, Turkey Journal Article 2019 10 24 We consider superquadratic functions f and define selfadjoint operators f(A) from some selfadjoint operators A on a reproducing kernel Hilbert space H=H(Q). We estimate the so-called Berezin number of operator f(A). http://cjms.journals.umz.ac.ir/article_2379_8bf664bdae2cd4dc30f5f1ee228bd2b4.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 On a class of Kirchhoff type systems with singular nonlinearity 28 38 3274 10.22080/cjms.2021.18811.1497 EN Saleh Shakeri Department of Mathematics, Ayatollah Amoli Branch, Islamic Azad University , Amol, Iran 0000-0003-2397-2542 Journal Article 2020 05 16 Using the method of sub-super solutions, we study the existence of<br /> positive solutions for a class of singular nonlinear semipositone<br /> systems involving nonlocal operator. http://cjms.journals.umz.ac.ir/article_3274_2cbf08c79c19666a9a7d031d6c428282.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Coefficient estimates and Fekete-Szeg"{o} coefficient inequality for new subclasses of Bi-univalent 39 50 3272 10.22080/cjms.2021.18442.1471 EN Hormoz Rahmatan Department of Mathematics, Faculty of Science, Payame Noor University, P.O.Box 19395-3697, Tehran, Iran Journal Article 2020 03 20 In this paper, we investigate two new subclasses \$S^*_sigma(a, b)\$ and \$nu_sigma(a, b)\$ of \$sigma\$ consisting of analytic and bi-univalent functions satisfying subordinations in the open unit disk \$mathbb{U}\$. We consider the Fekete-Szeg"{o} inequalities for these new subclasses. Also, we establish estimates for the coefficient for these subclasses. http://cjms.journals.umz.ac.ir/article_3272_725cc4449185c29a18af9abb625614b3.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Some fixed point results for weakly \$b-(varphi,G)\$ contraction in \$b-\$metric spacs endowed with a graph 51 56 3276 10.22080/cjms.2021.18834.1506 EN Hamid Faraji Department of Mathematics, College of Technical and Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran. 0000-0002-5313-127X Journal Article 2020 05 18 In this paper, we introduce the concept of weakly \$b-(varphi,G)\$ contraction mapping in \$b\$-metric spaces endowed with a graph and give some fixed point results for such contractions. http://cjms.journals.umz.ac.ir/article_3276_11cdf9bc586cc1d5195756025803eb97.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 On the D-concircular curvature tensor of a generalized Sasakian-Space-form 57 67 2515 10.22080/cjms.2020.17388.1431 EN Ali Akbar Hosseinzadeh Department of Mathematics, University of Zabol, Zabol, Iran Journal Article 2019 10 22 The object of this paper is to study of D-concircular curvature tensor on generalized Sasakian-space-forms. Actually we consider generalized Sasakian-space-forms when it is, respectively: D-concircularly flat; D-concircular-pseudosymmetric; D-concircularly Ricci-semisymmetric; D-concircularly symmetric; \$V (xi;X) .R = 0\$. Most of the main results obtained in this paper are in the form of necessary and sufficient conditions. http://cjms.journals.umz.ac.ir/article_2515_d38a4aa1e6f8636b979eb3acb7e5e7a8.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Application of spectral methods to solve nonlinear buckling analysis of an elastic beam 68 76 3275 10.22080/cjms.2021.18815.1499 EN Asiyeh Ebrahimzadeh Assistent Professor, Department of Mathematics Education, Farhangian University, Tehran, Iran Samaneh Panjeh Ali Beik National Center of Medical Education Assessment, Tehran, Iran Journal Article 2020 05 17 This study is concerned with exploiting the spectral method to solve the fourth-order boundary value problem (BVP). Such equations frequently arise in the study and modeling of large amplitude transverse buckling in an elastic beam. To this end, the properties of shifted Legendre polynomial together with its operational matrix of the derivative and the spectral method is utilized to reduce BVP to a system of algebraic equations. Numerical results turn out the efficiency and accuracy of the propounded technique. http://cjms.journals.umz.ac.ir/article_3275_88c8622f18da081291ae021d843b60e6.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 On BI-Ideal elements in POE-AG-Groupoid 77 84 2819 10.22080/cjms.2020.17394.1433 EN Alireza Shabani Department of Mathematics Imam Khomaini Naval Academy, Nowshahr, Iran Mohammad Ali Shamalizade Imam Kamenei Complex, Imam Hossin Univirsity, Tehran, Iran Journal Article 2019 10 22 In this paper we introduce the concept of ideal and bi-ideal elements in poe-AG-groupoid and give some characterizations and properties of their bi-ideal elements. So we consider some results concerning bi-ideals in poe-semigroups and investigate them in poe-AG-groupoids. Also, the class of bi-ideal elements of poe-AG-groupoids are studied, certain intrinsic and basic properties of poe-AG-groupoids including:∧-semilattice, bi-ideal, semiprime, weaklyprime, totallyorderedelements and etc. are studied as well. The corresponding results on poe-semigroups can be also obtained as application of the results of this paper. http://cjms.journals.umz.ac.ir/article_2819_dc810ddd1fe3634a123c504640dbbb91.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 The induced contractive maps on the covering spaces 85 92 2812 10.22080/cjms.2020.18710.1487 EN Zahra Shabani Siahkalde Department of Mathematics, Faculty of Mathematics, University of Sistan and Baluchestan, Zahedan, Iran Tayyebe Nasri Department of Pure Mathematics, Faculty of Basic Sciences, University of Bojnord, Bojnord, Iran Journal Article 2020 05 11 ‎ ‎Let \$(tilde{X},p)\$ be the universal covering space of a compact metrizable space \$ X \$‎, ‎which is compact and locally path connected‎. <br /> ‎In this paper‎, ‎we show that there exist metrics \$ d \$ and \$ d' \$ for \$ X \$ and \$tilde{X} \$‎, ‎respectively‎, ‎such that any contractive map ‎\$ f:Xto X \$ induces a contractive map on \$ tilde{X}\$. ‎As an‎ application‎, ‎it is obtained that every iterated function system(IFS) on the space \$ X \$ with attractor \$ K \$‎, ‎induces an IFS on \$tilde{ X} \$ with attractor \$tilde{K},\$ such that \$ p(tilde{K})=K\$‎. http://cjms.journals.umz.ac.ir/article_2812_c40650d3fc7478acef86feb0450b3961.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Existence and uniqueness of solutions for neutral periodic integro-differential equations with infinite delay on time scale 93 103 3281 10.22080/cjms.2021.19819.1552 EN Haitham Makhzoum Department of mathematic, Faculty of Science, University of Benghazi, Benghazi, Libya 0000-0002-5381-0483 Abdelhamid S Elmabrok Department of Mathematics, Faculty of Science, University of Benghazi, Benghazi, Libya 0000000233930277 Rafik Elmansouri College of Electrical and Electronic Technology, Benghazi, Libya Journal Article 2020 09 20 In this article, we will shed the light on the following nonlinear neutral dynamic equation with infinite delay<br />begin{eqnarray*}label{e1}<br />{x(t)}^{Delta }=&& G(t, xleft(tright),xleft(t-tau left(tright)right))+{Q(t,x(t-tau (t)))}^{Delta }\<br />&&+int^t_{-infty }{left(sum^p_{i=1}{D_ileft(t,sright)}right)fleft(xleft(sright)right)}Delta s,<br />end{eqnarray*}<br />where \$mathbb{T}\$ is a periodic time scale. Using the fixed-point method by Krasnoselskii, we will show that equation has a periodic solution. In addition, we will prove this solution is unique by using the contraction mapping principle.<br /><br /> http://cjms.journals.umz.ac.ir/article_3281_4b1b0d8f4c6f6d145328f83fbd24740b.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Some results on Hermite-Hadamard type inequalities with respect to fractional integrals 104 111 2471 10.22080/cjms.2020.17502.1437 EN Hassan Barsam Department of Mathematics, University of Jiroft, Jiroft, Kerman, Iran Mehrab Ramezani Faculty of Technology and Mining, Yasouj University, Choram, Iran Journal Article 2019 10 31 In this paper, we establish Hermite-Hadamard type inequalities for uniformly p-convex<br /> functions. Also, a new fractional Hermite-Hadamard type inequality<br /> for convex functions is obtained by using only the left Riemann-Liouville fractional<br /> integral. Finally some extimation of left fractional integration studies for Hermite-<br /> Hadamard type inequalities. http://cjms.journals.umz.ac.ir/article_2471_267fbb8af6783ad542eebde244ee26c3.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 Group analysis of time-fractional equation with Riemann-Liouville derivative 112 120 2425 10.22080/cjms.2019.17364.1429 EN Nematollah Kadkhoda Department of Mathematics, Faculty of Basic Sciences, Bozorgmehr University of Qaenat, Qaenat, Iran Morteza Koozehgar Kalleji Department of Mathematics, Faculty of Sciences, Arak University, Arak 38156-8-8349, Iran Yasser Khalili Department of Basic Sciences, Sari Agricultural Sciences and Natural Resources University, 578 Sari, Iran Journal Article 2019 10 14 Finding Lie symmetries of nonlinear fractional differential equations plays an important role in studying fractional differential equations. The purpose of this manuscript is to find the<br /> Lie point symmetries of the time-fractional Buckmaster equation. After that we use the in nitesimal generators for obtaining their corresponding invariant solutions. http://cjms.journals.umz.ac.ir/article_2425_5599630a7a9e3c37a671fea24d362c0f.pdf
University of Mazandaran Caspian Journal of Mathematical Sciences (CJMS)peer 2676-7260 10 1 2021 12 01 F -Sums of Graphs and their Reformulated-Zagreb Indices 121 133 2588 10.22080/cjms.2020.13285.1329 EN K Pattabiraman Department of Mathematics, Government Arts , College(Autonomous) Kumbakonam 612 002, India A Santhakumar Department of Mathematics, CK College of Engineering and Technology, Cuddalore, India Journal Article 2017 12 08 The reformulated Zagreb index EM1(G) of a simple graph G is defined as the sum of the<br /> terms (du + dv − 2)2 over all edges uv of G. In this paper, we study the reformulated Zagreb<br /> indices for the F -sums of some special well-known graphs such as subdivision and total graph<br /> which is introduced by Eliasi and Taeri . http://cjms.journals.umz.ac.ir/article_2588_b48dd9a57b074add95b6056969e30a1c.pdf