ORIGINAL_ARTICLE
On the rank of the holomorphic solutions of PDE associated to directed graphs
Let G be a directed graph with m vertices and n edges, I(B) thebinomial ideal associated to the incidence matrix B of the graph G, and I_L the latticeideal associated to the columns of the matrix B. Also let B_i be a submatrix ofB after removing the ith column. In this paper it is determined that which primeminimal ideals of I(B_i) are Andean or toral. Then we study the rank of the spaceof solutions of binomial D-module associated to I(B_i) as A-graded ideal, where A isa matrix that, AB_i = 0. Afterwards, we define a maximal cellular cycle and provethat for computing this rank it is enough to consider these components of G. Weintroduce some bounds for the number of the vertices of the convex hull generatedby the columns of the matrix A. Finally an algorthim is introduced by which we cancompute the volume of the convex hull corresponded to a cycles with k diagonals, soby Theorem 2.1 the rank of (D / H_A(I(B_i); beta)) can be computed.
https://ajmc.aut.ac.ir/article_4121_93e1173b7519f0c5363021779bf5afe9.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
1
9
10.22060/ajmc.2020.18413.1031
Directed graph
Binomial D-module
Lattice basis ideal
Hamid
Damadi
hamid.damadi@aut.ac.ir
true
1
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
LEAD_AUTHOR
Farhad
Rahmati
frahmati@aut.ac.ir
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR
ORIGINAL_ARTICLE
Recognition by degree prime-power graph and order of some characteristically simple group
In this paper, by the order of a group and triviality of $O_p(G)$ for some prime $p$, we give a new characterization for some characteristically simple groups. In fact, we prove that if pϵ{5, 17, 23, 37, 47, 73} and n≤p, where $n$ is a natural number, then $Gcong{{rm PSL}(2,p)}^{n}$ if and only if $ |G|=|{{rm PSL}(2,p)}|^{n}$ and $ O_p(G)=1$.}Recently in [Qin, Yan, Shum and Chen, Comm. Algebra, 2019], the degree prime-power graph of a finite group have been introduced and it is proved that the Mathieu groups are uniquely determined by their degree prime-power graphs and orders. As a consequence of our results, we show that ${rm PSL}(2,p)^n$, where pϵ{5,17,23,37,47,73} and n≤p are uniquely determined by their degree prime-power graphs and orders.
https://ajmc.aut.ac.ir/article_4122_da8bcf27302b7048c4d44272e8b6fb02.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
11
15
10.22060/ajmc.2020.18418.1033
Degree prime power graph
order
characteristically simple group
Characterization
Afsane
Bahri
afsanebahri@aut.ac.ir
true
1
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR
Behrooz
Khosravi
bkhosravi@aut.ac.ir
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
LEAD_AUTHOR
Morteza
Baniasad Azad
baniasad84@gmail.com
true
3
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic)
AUTHOR
ORIGINAL_ARTICLE
A class of operator related weighted composition operators between Zygmund space
Let $mathbb {D}$ be the open unit disk in the complex plane $mathbb{C}$ and $H(mathbb{D})$ be the set of all analytic functions on $mathbb{D}$. Let $u, vin H(mathbb{D})$ and $varphi$ be an analytic self-map of $mathbb{D}$. A class of operator-related weighted composition operatorsis defined as followbegin{align*}T_{u, v, varphi}f(z) = u(z) f{(varphi(z))}+ v(z) f'(varphi(z)) ,quad fin H(mathbb{D} ), quad zin mathbb{D}.end{align*}In this work, we obtain some new characterizations for boundedness and essential norm of operator $T_{u, v, varphi}$ between Zygmund space.
https://ajmc.aut.ac.ir/article_4132_5f4531b1f76a9ff222c31d2ae30cd504.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
17
25
10.22060/ajmc.2020.18833.1041
boundedness
compactness
essential norm
Zygmund space
Ebrahim
Abbasi
ebrahimabbasi81@gmail.com
true
1
Department of Mathematics&lrm;, &lrm;Mahabad Branch&lrm;, &lrm;Islamic Azad University&lrm;, &lrm;Mahabad&lrm;, &lrm;Iran
Department of Mathematics&lrm;, &lrm;Mahabad Branch&lrm;, &lrm;Islamic Azad University&lrm;, &lrm;Mahabad&lrm;, &lrm;Iran
Department of Mathematics&lrm;, &lrm;Mahabad Branch&lrm;, &lrm;Islamic Azad University&lrm;, &lrm;Mahabad&lrm;, &lrm;Iran
LEAD_AUTHOR
ORIGINAL_ARTICLE
On GDW-Randers metrics on tangent Lie groups
Let $G$ be a Lie group equipped with a left-invariant Randers metric $F$. Suppose that $F^v$ and $F^c$ denote the vertical and complete lift of $F$ on $TG$, respectively. We give the necessary and sufficient conditions under which $F^v$ and $F^c$ are generalized Douglas-Weyl metrics. Then, we characterize all 2-step nilpotent Lie groups $G$ such that their tangent Lie groups $(TG, F^c)$ are generalized Douglas-Weyl Randers metrics.
https://ajmc.aut.ac.ir/article_4160_99ac5fe16a967d7286ca1720956c0a8f.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
27
36
10.22060/ajmc.2020.18572.1038
Left-invariant metric
Douglas metric
Generalized Douglas-Weyl Metrics
Mona
Atashafrouz
m.atashafrooz@aut.ac.ir
true
1
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR
Behzad
Najafi
behzad.najafi@aut.ac.ir
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
LEAD_AUTHOR
Akbar
Tayebi
akbar.tayebi@gmail.com
true
3
Department of Mathematics, Faculty of Science, University of Qom, Qom, Iran
Department of Mathematics, Faculty of Science, University of Qom, Qom, Iran
Department of Mathematics, Faculty of Science, University of Qom, Qom, Iran
AUTHOR
ORIGINAL_ARTICLE
Conservation law and Lie symmetry analysis of foam drainage equation
In this paper, using the Lie group analysis method, we study the group invariant of the Foam Drainage equation. It shows that this equation can be reduced to ODE. Also we apply the Lie-group classical, and the nonclassical method due to Bluman and Cole to deduce symmetries of the Foam Drainage equation. and we prove that the nonclassical method applied to the equation leads to new reductions, which cannot be obtained by Lie classical symmetries. Also this paper shows how to construct directly the local conservation laws for this equation
https://ajmc.aut.ac.ir/article_4161_afc061bca696a62e35f9dcb82217760b.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
37
44
10.22060/ajmc.2020.18460.1036
Lie group analysis
Conservation law
Optimal system
Foam Drainage equation
Mehdi
Nadjafikhah
m_nadjafikhah@iust.ac.ir
true
1
School of Mathematics, Iran University of Science and Technology
School of Mathematics, Iran University of Science and Technology
School of Mathematics, Iran University of Science and Technology
LEAD_AUTHOR
Omid
Chekini
omid_chgini@mathdep.iust.ac.ir
true
2
School of Mathematics, Iran University of Science and Technology
School of Mathematics, Iran University of Science and Technology
School of Mathematics, Iran University of Science and Technology
AUTHOR
ORIGINAL_ARTICLE
An extension of the Cardioid distributions on circle
A new family of distributions on the circle is introduced which is a generalization of the Cardioid distributions. The elementary properties such as mean, variance, and the characteristic function are computed. The distribution is shown to be either unimodal or bimodal. The modes are computed. The symmetry of the distribution is characterized. The parameters are shown to be canonic (i.e. uniquely determined by the distribution). This implies that the estimation problem is well-defined. We also show that this new family is a subset of distributions whose Fourier series has degree at most 2 and study the implications of this property. Finally, we study the maximum likelihood estimation for this family.
https://ajmc.aut.ac.ir/article_4209_384f506c165ebe2a3d5dda21192cfab2.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
45
52
10.22060/ajmc.2020.18285.1029
Circular Distributions
Cardioid Distribution
Von Mises Distribution
Erfan
Salavati
erfan.salavati@aut.ac.ir
true
1
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
LEAD_AUTHOR
ORIGINAL_ARTICLE
Estimation of the parameter of Levy distribution using ranked set sampling
Ranked set sampling is a statistical technique for data collection that generallyleads to more efficient estimators than competitors based on simple random sampling.In this paper, we consider estimation of scale parameter of Levy distribution using a ranked set sample. We derive the best linear unbiased estimatorand its variance, based on a ranked set sample. Also we compare numerically, variance of this estimator with mean square error of the maximum likelihood, a median based estimator and an estimator based on Laplace transform. It turns out that the best linear unbiased estimator based on ranked set sampling is more efficient than other mentioned estimators.
https://ajmc.aut.ac.ir/article_4216_661b34a7a906b39e9ebb29c2a6594145.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
53
60
10.22060/ajmc.2020.18499.1037
Best linear unbiased estimator
Levy distribution
Ranked set sampling
Scale parameter
Sahar
Dorniani
sdorniani@yahoo.com
true
1
Department of Statistics, Roudehen
Branch, Islamic Azad University, Tehran, Iran
Department of Statistics, Roudehen
Branch, Islamic Azad University, Tehran, Iran
Department of Statistics, Roudehen
Branch, Islamic Azad University, Tehran, Iran
LEAD_AUTHOR
Adel
Mohammadpour
adelmohammadpour1@gmail.com
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR
Nader
Nematollahi
na_nemat@yahoo.com
true
3
Department of Statistics, Allameh Tabataba'i University, Tehran, Iran.
Department of Statistics, Allameh Tabataba'i University, Tehran, Iran.
Department of Statistics, Allameh Tabataba'i University, Tehran, Iran.
AUTHOR
ORIGINAL_ARTICLE
Some conformal vector fields and conformal Ricci solitons on N(k)-contact metric manifolds
Abstract. The target of this paper is to study N(k)-contact metric manifoldswith some types of conformal vector fields like φ-holomorphic planar conformalvector fields and Ricci biconformal vector fields. We also characterize N(k)-contact metric manifolds allowing conformal Ricci almost soliton. Obtained results are supported by examples.
https://ajmc.aut.ac.ir/article_4246_49abb7a8ca957aa03ddcb0d92035d54f.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
61
71
10.22060/ajmc.2021.19220.1043
N(k)-contact metric manifolds
φ-holomorphic planar conformal vector fields
conformal vector fields and conformal Ricci solitons
Uday
De
uc_de@yahoo.com
true
1
Department of Pure Mathematics, Faculty of Science, University of Calcutta, Kolkata, India
Department of Pure Mathematics, Faculty of Science, University of Calcutta, Kolkata, India
Department of Pure Mathematics, Faculty of Science, University of Calcutta, Kolkata, India
AUTHOR
Arpan
Sardar
arpansardar51@gmail.com
true
2
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal, India
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal, India
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal, India
AUTHOR
Avijit
Sarkar
avjaj@yahoo.co.in
true
3
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal
Department of Mathematics, Faculty of Science, University of Kalyani, West Bengal
LEAD_AUTHOR
ORIGINAL_ARTICLE
On the reversible geodesics of a Finsler space endowed with a special deformed (α,β)-metric
The scope of this paper is twofold. On the one hand, we will investigate the reversible geodesics of a Finsler space endowed with the deformed newly introduced (α,β)-metric begin{equation}F_{ε}(α,β)=frac{β^{2}+α^{2}(a+1)}{α}+εβend{equation}where ε is a real parameter with |ε|<2√a+1 and a\in(¼,∞); and on the other hand, we will investigate the T-tensor for this metric.
https://ajmc.aut.ac.ir/article_4270_79017ac55e6d25372a6b270022c5cfae.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
73
80
10.22060/ajmc.2021.19522.1048
Finsler (α,β)-metric
deformation of an (α,β)-metric
T-tensor
Laurian-Ioan
Pişcoran
plaurian@yahoo.com
true
1
Department of Mathematics and Computer Science, Victoriei 76, 430122 Baia Mare, Romania
Department of Mathematics and Computer Science, Victoriei 76, 430122 Baia Mare, Romania
Department of Mathematics and Computer Science, Victoriei 76, 430122 Baia Mare, Romania
LEAD_AUTHOR
Ali
Akram
akramali@ufam.edu.br
true
2
Departamento de Matematica-ICE, Universidade Federal de Amazonas-UFAM, 69080-900 Manaus
Departamento de Matematica-ICE, Universidade Federal de Amazonas-UFAM, 69080-900 Manaus
Departamento de Matematica-ICE, Universidade Federal de Amazonas-UFAM, 69080-900 Manaus
AUTHOR
Cătălin
Barbu
kafka_mate@yahoo.com
true
3
"Vasile Alecsandri" National College, str. Vasile Alecsandri nr. 37, Bacau, Romania
"Vasile Alecsandri" National College, str. Vasile Alecsandri nr. 37, Bacau, Romania
"Vasile Alecsandri" National College, str. Vasile Alecsandri nr. 37, Bacau, Romania
AUTHOR
ORIGINAL_ARTICLE
Ensuring software maintainability at software architecture level using architectural patterns
Software architecture is known to be an effective tool with regards to improving software quality attributes. Many quality attributes such as maintainability are architecture dependent, and as such, using an appropriate architecture is essential in providing a sound foundation for the development of highly maintainable software systems. An effective way to produce a well-built architecture is to utilize standard architectural patterns.Although the use of a particular architectural pattern cannot have a preserving effect on software maintainability, the mere conformance of a system to any architecture cannot guarantee the system's high maintainability.The use of an inappropriate architecture can seriously undermine software maintainability at lower levels. In this article, the effect of standard architectural patterns on software maintainability quality attributes is investigated. We develop a quality model for maintainability quality attributes, which is later used to compare various standard architectural patterns.We finish by investigating two real-world experiences regarding the application of a particular pattern to two different existing architectures, exploring the effect of the change in architecture on maintainability quality attributes.
https://ajmc.aut.ac.ir/article_4272_ea7523c9c3f0cbd33e998b1518ca6ac7.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
81
102
10.22060/ajmc.2021.19232.1044
Patterns
Software Architecture
Maintainability
Mohammad
Tanhaei
m.tanhaei@ilam.ac.ir
true
1
Department of Engineering, Ilam University
Department of Engineering, Ilam University
Department of Engineering, Ilam University
LEAD_AUTHOR
Zahed
Rahmati
zrahmati@aut.ac.ir
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR
ORIGINAL_ARTICLE
On some aspects of measure and probability logics and a new logical proof for a theorem of Stone
One of the functions of mathematical logic is studying mathematical objects and notions by logical means. There are several important representation theorems in analysis. Amongst them, there is a well-known classical one which concerns probability algebras. There are quite a few proofs of this result in the literature. This paper pursues two main goals. One is to consider some aspects of measure and probability logics and expose a novel proof for the mentioned representation theorem using ideas from logic and by application of an important result from model theory.The second and even more important goal is to present more connections between two fields of analysis and logic and reveal more the strength of logical methods and tools in analysis. The paper is mostly written for general mathematicians, in particular the people who are active in analysis or logic as the main audience. It is self-contained and includes all prerequisites from logic and analysis.
https://ajmc.aut.ac.ir/article_4273_b920b2f4d47c144f8ab42c1255b06e16.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
103
108
10.22060/ajmc.2021.19318.1045
Integration and probability logics
Representations and measure existence theorems
Compactness in logic
Alireza
Mofidi
mofidi@aut.ac.ir
true
1
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
LEAD_AUTHOR
ORIGINAL_ARTICLE
The complexity of cost constrained vehicle scheduling problem
This paper considered the cost constrained vehicle scheduling problem under the constraint that the total number of vehicles is known in advance. Each depot has a different time processing cost. The goal of this problem is to find a feasible minimum cost schedule for vehicles. A mathematical formulation of the problem is developed and the complexity of the problem when there are more than two depots is investigated. It is proved that in this case, the problem is NP-complete. Also, it is showed that there is not any constant ratio approximation algorithm for the problem, i.e., it is in the complexity class APX.
https://ajmc.aut.ac.ir/article_4274_0c3d0bce2666603bc3ec6491c11a6032.pdf
2021-02-01T11:23:20
2021-04-16T11:23:20
109
115
10.22060/ajmc.2021.19454.1046
Vehicle scheduling problem
Fixed job scheduling
NP-complete
Approximation algorithm
APX
Malihe
Niksirat
niksirat@birjandut.ac.ir
true
1
Department of Computer Science, Faculty of Computer and Industrial Engineering, Birjand University of Technology, Birjand, Iran
Department of Computer Science, Faculty of Computer and Industrial Engineering, Birjand University of Technology, Birjand, Iran
Department of Computer Science, Faculty of Computer and Industrial Engineering, Birjand University of Technology, Birjand, Iran
LEAD_AUTHOR
Seyed Naser
Hashemi
nhashemi@aut.ac.ir
true
2
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Department of Mathematics and Computer Science, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
AUTHOR