Journal Description
Axioms
Axioms
is an international, peer-reviewed, open access journal of mathematics, mathematical logic and mathematical physics, published monthly online by MDPI. The European Society for Fuzzy Logic and Technology (EUSFLAT), International Fuzzy Systems Association (IFSA) and Union of Slovak Mathematicians and Physicists (JSMF) are affiliated with Axioms and their members receive discounts on the article processing charges.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High visibility: indexed within SCIE (Web of Science), dblp, and other databases.
- Journal Rank: JCR - Q2 (Mathematics, Applied)
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 21.8 days after submission; acceptance to publication is undertaken in 2.8 days (median values for papers published in this journal in the second half of 2023).
- Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.
- Companion journal: Logics.
Impact Factor:
2.0 (2022);
5-Year Impact Factor:
1.9 (2022)
Latest Articles
Characterization of Pseudo-Differential Operators Associated with the Coupled Fractional Fourier Transform
Axioms 2024, 13(5), 296; https://doi.org/10.3390/axioms13050296 (registering DOI) - 28 Apr 2024
Abstract
The main aim of this article is to derive certain continuity and boundedness properties of the coupled fractional Fourier transform on Schwartz-like spaces. We extend the domain of the coupled fractional Fourier transform to the space of tempered distributions and then study the
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The main aim of this article is to derive certain continuity and boundedness properties of the coupled fractional Fourier transform on Schwartz-like spaces. We extend the domain of the coupled fractional Fourier transform to the space of tempered distributions and then study the mapping properties of pseudo-differential operators associated with the coupled fractional Fourier transform on a Schwartz-like space. We conclude the article by applying some of the results to obtain an analytical solution of a generalized heat equation.
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Open AccessArticle
Weighted Least Squares Regression with the Best Robustness and High Computability
by
Yijun Zuo and Hanwen Zuo
Axioms 2024, 13(5), 295; https://doi.org/10.3390/axioms13050295 (registering DOI) - 27 Apr 2024
Abstract
A novel regression method is introduced and studied. The procedure weights squared residuals based on their magnitude. Unlike the classic least squares which treats every squared residual as equally important, the new procedure exponentially down-weights squared residuals that lie far away from the
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A novel regression method is introduced and studied. The procedure weights squared residuals based on their magnitude. Unlike the classic least squares which treats every squared residual as equally important, the new procedure exponentially down-weights squared residuals that lie far away from the cloud of all residuals and assigns a constant weight (one) to squared residuals that lie close to the center of the squared-residual cloud. The new procedure can keep a good balance between robustness and efficiency; it possesses the highest breakdown point robustness for any regression equivariant procedure, being much more robust than the classic least squares, yet much more efficient than the benchmark robust method, the least trimmed squares (LTS) of Rousseeuw. With a smooth weight function, the new procedure could be computed very fast by the first-order (first-derivative) method and the second-order (second-derivative) method. Assertions and other theoretical findings are verified in simulated and real data examples.
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(This article belongs to the Special Issue New Perspectives in Mathematical Statistics)
Open AccessArticle
Ground State Solutions for a Non-Local Type Problem in Fractional Orlicz Sobolev Spaces
by
Liben Wang, Xingyong Zhang and Cuiling Liu
Axioms 2024, 13(5), 294; https://doi.org/10.3390/axioms13050294 (registering DOI) - 27 Apr 2024
Abstract
In this paper,we study the following non-local problem in fractional Orlicz–Sobolev spaces:
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In this paper,we study the following non-local problem in fractional Orlicz–Sobolev spaces: , where denotes the non-local and maybe non-homogeneous operator, the so-called fractional -Laplacian. Without assuming the Ambrosetti–Rabinowitz type and the Nehari type conditions on the non-linearity f, we obtain the existence of ground state solutions for the above problem with periodic potential function . The proof is based on a variant version of the mountain pass theorem and a Lions’ type result in fractional Orlicz–Sobolev spaces.
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(This article belongs to the Special Issue Special Topics in Differential Equations with Applications)
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Conditions When the Problems of Linear Programming Are Algorithmically Unsolvable
by
Viktor Chernov and Vladimir Chernov
Axioms 2024, 13(5), 293; https://doi.org/10.3390/axioms13050293 (registering DOI) - 27 Apr 2024
Abstract
We study the properties of the constructive linear programming problems. The parameters of linear functions in such problems are constructive real numbers. Solving such a problem involves finding the optimal plan with the constructive real number components. We show that it is impossible
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We study the properties of the constructive linear programming problems. The parameters of linear functions in such problems are constructive real numbers. Solving such a problem involves finding the optimal plan with the constructive real number components. We show that it is impossible to have an algorithm that solves an arbitrary constructive real programming problem.
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(This article belongs to the Special Issue Advances in Linear Algebra with Applications)
Open AccessArticle
Ideals and Filters on Neutrosophic Topologies Generated by Neutrosophic Relations
by
Ravi P. Agarwal, Soheyb Milles, Brahim Ziane, Abdelaziz Mennouni and Lemnaouar Zedam
Axioms 2024, 13(5), 292; https://doi.org/10.3390/axioms13050292 - 25 Apr 2024
Abstract
Recently, Milles and Hammami presented and studied the concept of a neutrosophic topology generated by a neutrosophic relation. As a continuation in the same direction, this paper studies the concepts of neutrosophic ideals and neutrosophic filters on that topology. More precisely, we offer
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Recently, Milles and Hammami presented and studied the concept of a neutrosophic topology generated by a neutrosophic relation. As a continuation in the same direction, this paper studies the concepts of neutrosophic ideals and neutrosophic filters on that topology. More precisely, we offer the lattice structure of neutrosophic open sets of a neutrosophic topology generated via a neutrosophic relation and examine its different characteristics. Furthermore, we enlarge to this lattice structure the notions of ideals (respectively, filters) and characterize them with regard to the lattice operations. We end this work by studying the prime neutrosophic ideal and prime neutrosophic filter as interesting types of neutrosophic ideals and neutrosophic filters.
Full article
(This article belongs to the Special Issue Advances in Classical and Applied Mathematics)
Open AccessArticle
Hyperholomorphicity by Proposing the Corresponding Cauchy–Riemann Equation in the Extended Quaternion Field
by
Ji-Eun Kim
Axioms 2024, 13(5), 291; https://doi.org/10.3390/axioms13050291 - 25 Apr 2024
Abstract
In algebra, the sedenions, an extension of the octonion system, form a 16-dimensional noncommutative and nonassociative algebra over the real numbers. It can be expressed as two octonions, and a function and differential operator can be defined to treat the sedenion, expressed as
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In algebra, the sedenions, an extension of the octonion system, form a 16-dimensional noncommutative and nonassociative algebra over the real numbers. It can be expressed as two octonions, and a function and differential operator can be defined to treat the sedenion, expressed as two octonions, as a variable. By configuring elements using the structure of complex numbers, the characteristics of octonions, the stage before expansion, can be utilized. The basis of a sedenion can be simplified and used for calculations. We propose a corresponding Cauchy–Riemann equation by defining a regular function for two octonions with a complex structure. Based on this, the integration theorem of regular functions with a sedenion of the complex structure is given. The relationship between regular functions and holomorphy is presented, presenting the basis of function theory for a sedenion of the complex structure.
Full article
(This article belongs to the Special Issue Research on Functional Analysis and Its Applications)
Open AccessArticle
Full Classification of Finite Singleton Local Rings
by
Sami Alabiad and Yousef Alkhamees
Axioms 2024, 13(5), 290; https://doi.org/10.3390/axioms13050290 - 25 Apr 2024
Abstract
The main objective of this article is to classify all finite singleton local rings, which are associative rings characterized by a unique maximal ideal and a distinguished basis consisting of a single element. These rings are associated with four positive integer invariants
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The main objective of this article is to classify all finite singleton local rings, which are associative rings characterized by a unique maximal ideal and a distinguished basis consisting of a single element. These rings are associated with four positive integer invariants , and where p is a prime number. In particular, we aim to classify these rings and count them up to isomorphism while maintaining the same set of invariants. We have found interesting cases of finite singleton local rings with orders of and that hold substantial importance in the field of coding theory.
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Photon-Added Deformed Peremolov Coherent States and Quantum Entanglement
by
Kamal Berrada
Axioms 2024, 13(5), 289; https://doi.org/10.3390/axioms13050289 - 24 Apr 2024
Abstract
In the present article, we build the excitedcoherent states associated with deformed algebra (DSUA), called photon-added deformed Perelomov coherent states (PA-DPCSs). The constructed coherent states are obtained by using an alterationof the Holstein–Primakoff realization (HPR) for
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In the present article, we build the excitedcoherent states associated with deformed algebra (DSUA), called photon-added deformed Perelomov coherent states (PA-DPCSs). The constructed coherent states are obtained by using an alterationof the Holstein–Primakoff realization (HPR) for DSUA. A general method to resolve of the problem of the unitary operator was developed for these kinds of quantum states. The Mandel parameter is considered to examine the statistical properties of PA-DPCSs. Furthermore, we offer a physical method to generate the PA-DPCSs in the framework of interaction among fields and atoms. Finally, we introduce the concept of entangled states for PA-DPCSs and examine the entanglement properties for entangled PA-DPCSs.
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(This article belongs to the Special Issue The Advancement in Mathematical and Quantum Physics)
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Sparse Signal Recovery via Rescaled Matching Pursuit
by
Wan Li and Peixin Ye
Axioms 2024, 13(5), 288; https://doi.org/10.3390/axioms13050288 - 24 Apr 2024
Abstract
We propose the Rescaled Matching Pursuit (RMP) algorithm to recover sparse signals in high-dimensional Euclidean spaces. The RMP algorithm has less computational complexity than other greedy-type algorithms, such as Orthogonal Matching Pursuit (OMP). We show that if the restricted isometry property is satisfied,
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We propose the Rescaled Matching Pursuit (RMP) algorithm to recover sparse signals in high-dimensional Euclidean spaces. The RMP algorithm has less computational complexity than other greedy-type algorithms, such as Orthogonal Matching Pursuit (OMP). We show that if the restricted isometry property is satisfied, then the upper bound of the error between the original signal and its approximation can be derived. Furthermore, we prove that the RMP algorithm can find the correct support of sparse signals from random measurements with a high probability. Our numerical experiments also verify this conclusion and show that RMP is stable with the noise. So, the RMP algorithm is a suitable method for recovering sparse signals.
Full article
(This article belongs to the Special Issue Numerical Computation, Approximation of Functions and Applied Mathematics II)
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Display Conventions for Octagons of Opposition
by
David Makinson
Axioms 2024, 13(5), 287; https://doi.org/10.3390/axioms13050287 - 24 Apr 2024
Abstract
As usually presented, octagons of opposition are rather complex objects and can be difficult to assimilate at a glance. We show how, under suitable conditions that are satisfied by most historical examples, different display conventions can simplify the diagrams, making them easier for
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As usually presented, octagons of opposition are rather complex objects and can be difficult to assimilate at a glance. We show how, under suitable conditions that are satisfied by most historical examples, different display conventions can simplify the diagrams, making them easier for readers to grasp without the loss of information. Moreover, those conditions help reveal the conceptual structure behind the visual display.
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(This article belongs to the Special Issue Modal Logic and Logical Geometry)
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On the Convergence of an Approximation Scheme of Fractional-Step Type, Associated to a Nonlinear Second-Order System with Coupled In-Homogeneous Dynamic Boundary Conditions
by
Constantin Fetecău, Costică Moroşanu and Silviu-Dumitru Pavăl
Axioms 2024, 13(5), 286; https://doi.org/10.3390/axioms13050286 - 23 Apr 2024
Abstract
The paper concerns a nonlinear second-order system of coupled PDEs, having the principal part in divergence form and subject to in-homogeneous dynamic boundary conditions, for both and . Two main topics
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The paper concerns a nonlinear second-order system of coupled PDEs, having the principal part in divergence form and subject to in-homogeneous dynamic boundary conditions, for both and . Two main topics are addressed here, as follows. First, under a certain hypothesis on the input data, , , , , , , , , , and , we prove the well-posedness of a solution , which is , , . According to the new formulation of the problem, we extend the previous results, allowing the new mathematical model to be even more complete to describe the diversity of physical phenomena to which it can be applied: interface problems, image analysis, epidemics, etc. The main goal of the present paper is to develop an iterative scheme of fractional-step type in order to approximate the unique solution to the nonlinear second-order system. The convergence result is established for the new numerical method, and on the basis of this approach, a conceptual algorithm, alg-frac_sec-ord_u+varphi_dbc, is elaborated. The benefit brought by such a method consists of simplifying the computations so that the time required to approximate the solutions decreases significantly. Some conclusions are given as well as new research topics for the future.
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(This article belongs to the Special Issue Numerical Computation, Approximation of Functions and Applied Mathematics II)
Open AccessArticle
Combined Observer-Based State Feedback and Optimized P/PI Control for a Robust Operation of Quadrotors
by
Oussama Benzinane and Andreas Rauh
Axioms 2024, 13(5), 285; https://doi.org/10.3390/axioms13050285 - 23 Apr 2024
Abstract
This paper deals with a discrete-time observer-based state feedback control design by taking into consideration bounded parameter uncertainty, actuator faults, and stochastic noise in an inner control loop which is extended in a cascaded manner by outer PI- and P-control loops for velocity
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This paper deals with a discrete-time observer-based state feedback control design by taking into consideration bounded parameter uncertainty, actuator faults, and stochastic noise in an inner control loop which is extended in a cascaded manner by outer PI- and P-control loops for velocity and position regulation. The aim of the corresponding subdivision of the quadrotor model is the treatment of the control design in a systematic manner. In the inner loop, linear matrix inequality techniques are employed for the placement of poles into a desired area within the complex z-plane. A robustification of the design towards noise is achieved by optimizing both control and observer gains simultaneously guaranteeing stability in a predefined bounded state domain. This procedure helps to reduce the sensitivity of the inner control loop towards changes induced by the outer one. Finally, a model-based optimization process is employed to tune the parameters of the outer P/PI controllers. To allow for the validation of accurate trajectory tracking, a comparison of the novel approach with the use of a standard extended Kalman filter-based linear-quadratic regulator synthesis is presented to demonstrate the superiority of the new design.
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(This article belongs to the Special Issue Advances in Mathematical Methods in Optimal Control and Applications)
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Analytic Solutions for Hilfer Type Fractional Langevin Equations with Variable Coefficients in a Weighted Space
by
Fang Li, Ling Yang and Huiwen Wang
Axioms 2024, 13(5), 284; https://doi.org/10.3390/axioms13050284 - 23 Apr 2024
Abstract
In this work, analytic solutions of initial value problems for fractional Langevin equations involving Hilfer fractional derivatives and variable coefficients are studied. Firstly, the equivalence of an initial value problem to an integral equation is proved. Secondly, the existence and uniqueness of solutions
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In this work, analytic solutions of initial value problems for fractional Langevin equations involving Hilfer fractional derivatives and variable coefficients are studied. Firstly, the equivalence of an initial value problem to an integral equation is proved. Secondly, the existence and uniqueness of solutions for the above initial value problem are obtained without a contractive assumption. Finally, a formula of explicit solutions for the proposed problem is derived. By using similar arguments, corresponding conclusions for the case involving Riemann–Liouville fractional derivatives and variable coefficients are obtained. Moreover, the nonlinear case is discussed. Two examples are provided to illustrate theoretical results.
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(This article belongs to the Special Issue Recent Advances in Fractional Differential Equations and Inequalities)
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A Comprehensive Study of Generalized Lambert, Generalized Stieltjes, and Stieltjes–Poisson Transforms
by
Jeetendrasingh Maan and E. R. Negrín
Axioms 2024, 13(5), 283; https://doi.org/10.3390/axioms13050283 - 23 Apr 2024
Abstract
In this paper, we explore the properties of the generalized Lambert transform, the L-transform, the generalized Stieltjes transform, and the Stieltjes–Poisson transform within the framework of Lebesgue spaces. We establish Parseval-type relations for each transform, providing a comprehensive analysis of their behaviour and
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In this paper, we explore the properties of the generalized Lambert transform, the L-transform, the generalized Stieltjes transform, and the Stieltjes–Poisson transform within the framework of Lebesgue spaces. We establish Parseval-type relations for each transform, providing a comprehensive analysis of their behaviour and mathematical characteristics.
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(This article belongs to the Special Issue Recent Advances in Special Functions and Applications)
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A Class of Multi-Component Non-Isospectral TD Hierarchies and Their Bi-Hamiltonian Structures
by
Jianduo Yu and Haifeng Wang
Axioms 2024, 13(5), 282; https://doi.org/10.3390/axioms13050282 - 23 Apr 2024
Abstract
By using the classical Lie algebra, the stationary zero curvature equation, and the Lenard recursion equations, we obtain the non-isospectral TD hierarchy. Two kinds of expanding higher-dimensional Lie algebras are presented by extending the classical Lie algebra. By solving the expanded non-isospectral zero
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By using the classical Lie algebra, the stationary zero curvature equation, and the Lenard recursion equations, we obtain the non-isospectral TD hierarchy. Two kinds of expanding higher-dimensional Lie algebras are presented by extending the classical Lie algebra. By solving the expanded non-isospectral zero curvature equations, the multi-component non-isospectral TD hierarchies are derived. The Hamiltonian structure for one of them is obtained by using the trace identity.
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(This article belongs to the Section Mathematical Physics)
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Numerical Investigation of Some Reductions for the Gatenby–Gawlinski Model
by
Corrado Mascia, Pierfrancesco Moschetta and Chiara Simeoni
Axioms 2024, 13(5), 281; https://doi.org/10.3390/axioms13050281 - 23 Apr 2024
Abstract
Two (consecutive) reductions of the complete Gatenby–Gawlinski model for cancer invasion are proposed in order to investigate the mathematical framework, mainly from a computational perspective. After a brief overview of the full model, we proceed by examining the case of a two-equations-based and
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Two (consecutive) reductions of the complete Gatenby–Gawlinski model for cancer invasion are proposed in order to investigate the mathematical framework, mainly from a computational perspective. After a brief overview of the full model, we proceed by examining the case of a two-equations-based and one-equation-based reduction, both obtained by means of a quasi-steady-state assumption. We focus on invasion fronts, exploiting a numerical strategy based on a finite volume approximation, and perform corresponding computational simulations to study the sharpness/smoothness of the traveling waves. Then, we employ a space-averaged wave speed estimate—referred to as the LeVeque–Yee formula—to quantitatively approach the propagation phenomenon. Concerning the one-equation-based model, we propose a scalar degenerate reaction-diffusion equation, which proves to be effective in order to qualitatively recover the typical trends arising from the Gatenby–Gawlinski model. Finally, we carry out some numerical tests in a specific case where the analytical solution is available.
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(This article belongs to the Section Mathematical Analysis)
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The Existence of Li–Yorke Chaos in a Discrete-Time Glycolytic Oscillator Model
by
Mirela Garić-Demirović, Mustafa R. S. Kulenović, Mehmed Nurkanović and Zehra Nurkanović
Axioms 2024, 13(4), 280; https://doi.org/10.3390/axioms13040280 - 22 Apr 2024
Abstract
This paper investigates an autonomous discrete-time glycolytic oscillator model with a unique positive equilibrium point which exhibits chaos in the sense of Li–Yorke in a certain region of the parameters. We use Marotto’s theorem to prove the existence of chaos by finding a
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This paper investigates an autonomous discrete-time glycolytic oscillator model with a unique positive equilibrium point which exhibits chaos in the sense of Li–Yorke in a certain region of the parameters. We use Marotto’s theorem to prove the existence of chaos by finding a snap-back repeller. The illustration of the results is presented by using numerical simulations.
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(This article belongs to the Special Issue Advances in Dynamical Systems and Control)
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Estimation of Gumbel Distribution Based on Ordered Maximum Ranked Set Sampling with Unequal Samples
by
Nuran Medhat Hassan and Osama Abdulaziz Alamri
Axioms 2024, 13(4), 279; https://doi.org/10.3390/axioms13040279 - 22 Apr 2024
Abstract
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Sample selection is one of the most important factors in estimating the unknown parameters of distributions, as it saves time, saves effort, and gives the best results. One of the challenges is deciding on a suitable distribution estimate technique and adequate sample selection
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Sample selection is one of the most important factors in estimating the unknown parameters of distributions, as it saves time, saves effort, and gives the best results. One of the challenges is deciding on a suitable distribution estimate technique and adequate sample selection to provide the best results in comparison with earlier research. The method of moments (MOM) was decided on to estimate the unknown parameters of the Gumbel distribution, but with four changes in the sample selection, which were simple random sample (SRS), ranked set sampling (RSS), maximum ranked set sampling (MRSS), and ordered maximum ranked set sampling (OMRSS) techniques, due to small sample sizes. The MOM is a traditional method for estimation, but it is difficult to use when dealing with RSS modification. RSS modification techniques were used to improve the efficiency of the estimators based on a small sample size compared with the usual SRS estimator. A Monte Carlo simulation study was carried out to compare the estimates based on different sampling. Finally, two datasets were used to demonstrate the adaptability of the Gumbel distribution based on the different sampling techniques.
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A Unified Representation of q- and h-Integrals and Consequences in Inequalities
by
Da Shi, Ghulam Farid, Bakri Adam Ibrahim Younis, Hanaa Abu-Zinadah and Matloob Anwar
Axioms 2024, 13(4), 278; https://doi.org/10.3390/axioms13040278 - 22 Apr 2024
Abstract
This paper aims to unify q-derivative/q-integrals and h-derivative/h-integrals into a single definition, called -derivative/ -integral. These notions are further extended on the finite interval in the
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This paper aims to unify q-derivative/q-integrals and h-derivative/h-integrals into a single definition, called -derivative/ -integral. These notions are further extended on the finite interval in the form of left and right -derivatives and -integrals. Some inequalities for -integrals are studied and directly connected with well known results in diverse fields of science and engineering. The theory based on q-derivatives/q-integrals and h-derivatives/h-integrals can be unified using the -derivative/ -integral concept.
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(This article belongs to the Special Issue Theory of Functions and Applications II)
Open AccessArticle
A Comprehensive Study of the Langevin Boundary Value Problems with Variable Order Fractional Derivatives
by
John R. Graef, Kadda Maazouz and Moussa Daif Allah Zaak
Axioms 2024, 13(4), 277; https://doi.org/10.3390/axioms13040277 - 21 Apr 2024
Abstract
The authors investigate Langevin boundary value problems containing a variable order Caputo fractional derivative. After presenting the background for the study, the authors provide the definitions, theorems, and lemmas that are required for comprehending the manuscript. The existence of solutions is proved using
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The authors investigate Langevin boundary value problems containing a variable order Caputo fractional derivative. After presenting the background for the study, the authors provide the definitions, theorems, and lemmas that are required for comprehending the manuscript. The existence of solutions is proved using Schauder’s fixed point theorem; the uniqueness of solutions is obtained by adding an additional hypothesis and applying Banach’s contraction principle. An example is provided to demonstrate the results.
Full article
(This article belongs to the Special Issue Fractional Calculus and Its Applications: Historical and Recent Developments)
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