Impact Factor: 2.0

Open Access Published since January 1, 1969

Demonstratio Mathematica

ISSN: 2391-4661

Editor-in-Chief: Calogero Vetro

Call for Papers

About this journal

Demonstratio Mathematica is a fully peer-reviewed, open access, electronic journal devoted to functional analysis, approximation theory, and related topics. The journal provides readers with free, instant, and permanent access to all content worldwide.

Demonstratio Mathematica accepts submissions of research articles, reviews, and communications. Submission of a manuscript implies that the work described is not copyrighted, published, or submitted elsewhere, except in abstract form. The corresponding author should ensure that all authors approve the manuscript before submission.

Aims and Scope

The potential topics include (but are not limited to):

Approximation theory and iteration methods

Fixed point theory and methods of computing fixed points

Functional, ordinary and partial differential equations

Nonsmooth analysis, variational analysis and convex analysis

Optimization theory, variational inequalities and complementarity problems

Your Benefits

As an author of Demonstratio Mathematica, You benefit from　

fair and constructive peer review

quick online publication of accepted papers (continuous publication model)

language polishing services upon acceptance for authors from non-English speaking regions

no limitations on colour figures and word count in published articles

all articles are freely available to the academic community worldwide without any restrictions

promotion of published papers to readers and citers

distribution to open access directories (such as DOAJ) and thousands of libraries worldwide

liberal policies on copyrights (authors retain copyright) and on self-archiving (no embargo periods) (License to Publish (CC-BY))

secure archiving by De Gruyter and the independent archiving service Portico

Article Processing Charges

In order to sustain the publishing process, each article accepted for publication in Demonstratio Mathematica is subject to an Article Processing Charge of €1000. This fee is used to cover the costs of the peer-review process, professional typesetting and copyediting, as well as online hosting, long-term preservation, and extensive promotion to potential readers. There is no submission fee. Information regarding payment of the charge will be provided following acceptance for publication. For more information please go to Article Processing Charges .

Publication Ethics and Editorial Policies

Detailed information on Editorial Policy, Publication Ethics, Instructions for Authors etc. can be found in the Supplementary Materials section.

For more information on De Gruyter Publishing Ethics, please see the De Gruyter Guidelines online here.

Special Issues

Approximation Theory and Special Functions – ATSF 2024 Conference - 8th Series
GUEST EDITORS: Oktay Duman (TOBB Economics and Technology University, Department of Mathematics, Ankara, Turkey), Harun Karsli (Abant Izzet Baysal University, Department of Mathematics, Bolu, Turkey), Mehmet Ali Ozarslan (Eastern Mediterranean University, Department of Mathematics, Famagusta, Mersin, Turkey)
DEADLINE FOR SUBMISSION: January 25, 2025

Variational Methods and Nonlinear PDEs
GUEST EDITORS: Binlin Zhang (Northeast Petroleum University, China), Jianjun Zhang (Chongqing Jiaotong University, China)
DEADLINE FOE SUBMISSIONS: May 31, 2025

We will publish a Special Issue in cooperation with the 3rd International conference: constructive mathematical analysis.

More information soon.

Abstracting and Indexing

Demonstratio Mathematica is covered by the following services:

Arianta
Baidu Scholar
BazTech
Cabells Journalytics
Chronos Hub
CNKI Scholar (China National Knowledge Infrastructure)
CNPIEC - cnpLINKer
Dimensions
DOAJ (Directory of Open Access Journals)
EBSCO (relevant databases)
EBSCO Discovery Service
Genamics JournalSeek
GoOA
Google Scholar
Index Copernicus
Japan Science and Technology Agency (JST)
J-Gate
JournalGuide
Mathematical Reviews (MathSciNet)
MyScienceWork
Naver Academic
Naviga (Softweco)
POL-index
Primo Central (ExLibris)
Publons
QOAM (Quality Open Access Market)
ReadCube
ScienceON (Korea Institute of Science and Technology Information)
Scilit
SCImago (SJR)
SCOPUS
Semantic Scholar
Sherpa/RoMEO
Summon (ProQuest)
TDNet
Ulrich's Periodicals Directory/ulrichsweb
WanFang Data
Web of Science - Current Contents/Physical, Chemical and Earth Sciences
Web of Science - Science Citation Index Expanded
WorldCat (OCLC)
X-MOL
Yewno Discover
zbMATH Open

Supplementary Materials

Topics

External Links

Volume 49 (2016)

Volume 48 (2015)

Volume 47 (2014)

Volume 46 (2013)

Volume 45 (2012)

Volume 44 (2011)

Volume 43 (2010)

Volume 42 (2009)

Volume 41 (2008)

Volume 40 (2007)

Volume 39 (2006)

Volume 38 (2005)

Volume 37 (2004)

Volume 36 (2003)

Volume 35 (2002)

Volume 34 (2001)

Volume 33 (2000)

Volume 32 (1999)

Volume 31 (1998)

Volume 30 (1997)

Volume 29 (1996)

Volume 28 (1995)

Volume 27 (1994)

Volume 26 (1993)

Volume 25 (1992)

Volume 24 (1991)

Volume 23 (1990)

Volume 22 (1989)

Volume 21 (1988)

Volume 20 (1987)

Volume 19 (1986)

Volume 18 (1985)

Volume 17 (1984)

Volume 16 (1983)

Volume 15 (1982)

Volume 14 (1981)

Volume 13 (1980)

Issue 4

Volume 12 (1979)

Volume 11 (1978)

Volume 10 (1977)

Volume 9 (1976)

Volume 8 (1975)

Volume 7 (1974)

Volume 5 (1973)

Volume 4 (1972)

Volume 3 (1971)

Volume 2 (1970)

Volume 1 (1969)

Demonstratio Mathematica publishes special and thematic issues focussed on important and emerging topics in the field of study. The journal has established a rigorous process to ensure that any special issue manuscripts follow the same high-quality standards and peer review processes as regular manuscripts. For further information on the journal’s peer review policy please see the "Instructions for Authors".

Call for Papers

Journal Impact Factor	2.0	2023, Journal Citation Reports (Clarivate, 2024)
5-year Journal Impact Factor	1.6	2023, Journal Citation Reports (Clarivate, 2024)
Journal Citation Indicator	1.68	2023, Journal Citation Reports (Clarivate, 2024)
CiteScore	2.4	2023, Scopus (Elsevier B.V., 2024)
SCImago Journal Rank	0.478	2023, SJR (Scimago Lab, 2024; Data Source: Scopus)
Source Normalized Impact per Paper	1.055	2023, CWTS Journal Indicators (CWTS B.V., 2024; Data Source: Scopus)
Mathematical Citation Quotient	0.45
Index Copernicus Value	175.93	2022, ICI Journals Master List (Index Copernicus, 2023)

More information about journal rankings

Submit

MANUSCRIPTS
Demonstratio Mathematica encourages the submission of substantial full-length bodies of work. There are no specific length restrictions for the overall manuscript or individual sections; however, we urge the authors to present and discuss their findings in a concise and accessible manner.

All submissions must be made via online submission system Editorial Manager. In case of problems, please contact the Editorial Office of this journal (demonstratio.editorial@degruyter.com).

SUBMISSION OF MANUSCRIPTS
Manuscripts have to be written in LATEX, AMS-TEX, AMS-LATEX. We do not accept papers in Plain TEX format. For an initial submission, the authors are strongly advised to upload their entire manuscript, including tables and figures, as a single PDF file. Authors are strongly advised to submit the final version of the paper using the journal’s LaTex Template.

For detailed information, please see Instruction for Authors

EDITORIAL POLICY
Unpublished material: Submission of a manuscript implies that the work described is not copyrighted, published or submitted elsewhere, except in abstract form. The corresponding author should ensure that all authors approve the manuscript before its submission.
Ethical conduct of research: The authors must describe and confirm safeguards to meet ethical standards when applicable. See Editorial Policy for details.
Conflict of interest: When authors submit a manuscript, they are responsible for recognizing and disclosing financial and/or other conflicts of interest that might bias their work and/or could inappropriately influence his/her judgment. If no specified acknowledgement is given, the Editors assume that no conflict of interest exists. Authors are encouraged to fill in the ICMJE Conflicts of Interest Form (available here) and send it in the electronic format to the Managing Editor.
Copyright: All authors retain copyright, unless – due to their local circumstances – their work is not copyrighted. The copyrights are governed by the Creative-Commons Attribution Only license (CC-BY) which is compliant with Plan-S. The corresponding author grants the journal the license to use of the article, by signing the License To Publish. Scanned copy of license should be sent to the journal, as soon as possible.
Authorship: Authorship should be limited to those who have made a significant contribution to the conception, design, execution, or interpretation of the reported study. All those who have made significant contributions should be listed as co-authors. Where there are others who have participated in certain substantive aspects of the research project, they should be named in an Acknowledgement section. The corresponding author should ensure that all appropriate co-authors (according to the above definition) and no inappropriate co-authors are included in the author list of the manuscript, and that all co-authors have seen and approved the final version of the paper and have agreed to its submission for publication. For more details the role of authors please see:　https://www.degruyter.com/publishing/for-authors/for-journal-authors/role-of-authors
Peer Review process: Our standard policy requires each paper reporting primary research or secondary analysis of primary research, together with relevant supplementary materials, to be reviewed by at least two Referees and the peer-review process is single-blind. The Editors reserve the right to decline the submitted manuscript without review, if the studies reported are not sufficiently novel or important to merit publication in the journal. Manuscripts deemed unsuitable (insufficient originality or of limited interest to the _target audience) are returned to the author(s) without review. The Editor seeks advice from experts in the appropriate field. Research articles and communications are refereed by a minimum of two reviewers, review papers by at least three. Authors are requested to suggest persons competent to review their manuscript. However, please note that this will be treated only as a suggestion, and the final selection of reviewers is exclusively the Editor's decision. The final decision of acceptance in made by Managing Editor or, in case of conflict, by the Editor-in-Chief.
Scientific Misconduct: This journal publishes only original manuscripts that are not also published or going to be published elsewhere. Multiple submissions/publications, or redundant publications (re-packaging in different words of data already published by the same authors) will be rejected. If they are detected only after publication, the journal reserves the right to publish a Retraction Note. In each particular case Editors will follow COPE’s Core Practices and implement the advices.

Editorial

Editor-in-Chief
Calogero Vetro, University of Palermo, Italy

Editorial Advisory Board
George Anastassiou, University of Memphis, USA
Marlene Frigon, University of Montréal, Canada
Doron Lubinsky, Georgia Institute of Technology, USA
Gradimir V. Milovanovic, Serbian Academy of Sciences and Arts, Serbia
Dumitru Motreanu, University of Perpignan, France
Donal O'Regan, National University of Ireland, Galway, Ireland
Tohru Ozawa, Waseda University, Japan
Tao Qian, University of Macau, China
Vicentiu Radulescu, AGH University of Science and Technology, Poland
Themistocles M. Rassias, National Technical University of Athens, Greece
Simeon Reich, Technion - Israel Institute of Technology, Israel
Bessem Samet, King Saud University, Saudi Arabia
Hari Mohan Srivastava, University of Victoria, Canada

Editorial Board
Tuncer Acar, Selcuk University, Turkey
Pietro Aiena, University of Palermo, Italy
Francesco Altomare, University of Bari, Italy
Esteban Andruchow, National University of General Sarmiento, Argentina
Ali Aral, Kirikkale University, Turkey
Pablo Manuel Berná Larrosa, CUNEF University, Spain
Dariusz Bugajewski, Adam Mickiewicz University, Poznań, Poland
Eduardo Chiumiento, La Plata National University, Argentina
Peter Danchev, Bulgarian Academy of Sciences, Bulgaria
Pietro d'Avenia, Polytechnic University of Bari, Italy
Oktay Duman, TOBB University of Economics and Technology, Turkey
Hemen Dutta, University of Gauhati, India
Giovany Figueiredo, Universidade de Brasília, Brasil
Cristina Flaut, Ovidius University of Constanta, Romania
Sorin-Mihai Grad, ENSTA Paris, France
Xian-Ming Gu, Southwestern University of Finance and Economics, China
Qui Han, Texas A&M University San Antonio, USA
Antonio Iannizzotto, University of Cagliari, Italy
Zenon Jabłoński, Jagiellonian University, Poland
Chao Ji, East China University of Science and Technology, China
Anna Kaminska, University of Memphis, USA
Erdal Karapinar, Çankaya University, Turkey
Alberto Lastra, University of Alcalá, Spain
Giuseppe Marino, University of Calabria, Italy
Salah Mahmoud Boulaaras, Department of Mathematics, College of Sciences and Arts in ArRass, Qassim University, Saudi Arabia
Dorian Popa, Technical University of Cluj-Napoca, Romania
Ioan Rasa, Technical University of Cluj-Napoca, Romania
Dušan D. Repovš, University of Ljubljana, Slovenia
Enrique A. Sánchez-Pérez, Technical University of Valencia, Spain
Wasfi Shatanawi, Hashemite University, Zarqa, Jordan
Plamen Simeonov, University of Houston-Downtown, USA
Tomonari Suzuki, Kyushu Institute of Technology, Japan
Gianluca Vinti, University of Perugia, Italy
Dariusz Wardowski, University of Lodz, Poland
Eric Weber, Iowa State University, USA
Patrick Winkert, Technische Universität Berlin, Germany
Weiping Yan, Guangxi University, China
Minbo Yang, Zhejiang Normal University, China.
Xiao-Jun Yang, China University of Mining and Technology, China
Binlin Zhang, Northeast Petroleum University, China
Shengda Zeng, Yulin Normal University, China
Bentuo Zheng, University of Memphis, USA
Jiabin Zuo, Guangzhou University, China

Publisher
DE GRUYTER Poland
Bogumila Zuga 32A Str.
01-811 Warsaw, Poland
T: +48 22 701 50 15

Editorial Contact
Kumaran Rengaswamy
Assistant Managing Editor, Compuscript
AssistantManagingEditor@degruyter.com

Managing Editor
Monika Maleszka
Monika.Maleszka@degruyter.com

Volume 57 Issue 1

January 2024

In the present work, we establish a quantitative estimate for the perturbed sampling Kantorovich operators in Orlicz spaces, in terms of the modulus of smoothness, defined by means of its modular functional. From the obtained result, we also deduce the qualitative order of approximation, by considering functions in suitable Lipschitz classes. This allows us to apply the above results in certain Orlicz spaces of particular interest, such as the interpolation spaces, the exponential spaces and the L p {L}^{p} -spaces, 1 ≤ p < + ∞ 1\le p\lt +\infty . In particular, in the latter case, we also provide an estimate established using a direct proof based on certain properties of the L p {L}^{p} -modulus of smoothness, which are not valid in the general case of Orlicz spaces. The possibility of using a direct approach allows us to improve the estimate that can be deduced as a consequence of the one achieved in Orlicz spaces. In the final part of the article, we furnish some estimates and the corresponding qualitative order of approximation in the space of uniformly continuous and bounded functions.

Review Articles

Open Access November 7, 2024

Penalty method for unilateral contact problem with Coulomb's friction in time-fractional derivatives

Lakbir Essafi, Mustapha Bouallala

Article number: 20240050

More Download PDF

Abstract

The purpose of this work is to study a mathematical model that describes a contact between a deformable body and a rigid foundation. A linear viscoelastic Kelvin-Voigt constitutive law with time-fractional derivatives describes the material’s behavior. The contact is modeled with Signorini’s condition coupled with Coulomb’s friction law. We derive a variational formulation of the model, and we prove the existence of a weak solution using the theory of monotone operators and Caputo derivative and the Rothe method. We also introduce the penalized problem and prove its solvability using the Galerkin method. Furthermore, we study the convergence of its solution to the solution of the original problem as the penalization parameter tends to zero.

Open Access December 10, 2024

Differential sandwich theorems for p-valent analytic functions associated with a generalization of the integral operator

Norah Saud Almutairi, Awatef Shahen, Hanan Darwish

Article number: 20240051

More Download PDF

Abstract

In this study, subordination, superordination, and sandwich theorems are established for a class of p -valent analytic functions involving a generalized integral operator that has as a special case p -valent Sălăgean integral operator. Relevant connections of the new results with several well-known ones are given as a conclusion for this investigation.

In a dynamic market marked by disruptions like pandemics and recessions, organizations face significant challenges in efficiently managing logistics processes and activities. The primary objective of this article is to propose an integrated four-phase model for assessing the efficiency of retail distribution warehouses based on principal component analysis-data envelopment analysis-improved fuzzy step-wise weight assessment ratio analysis-combined compromise solution (PCA-DEA-IMF SWARA-CoCoSo). The model provides a synergistic effect of all positive sides of the considered methods. PCA-DEA methods are used to reduce the number of variables and to identify efficient warehouses. IMF SWARA is applied to determine criteria weights, while the CoCoSo method is employed in the last phase for ranking efficient warehouses. The model incorporates 18 inputs and 3 outputs, derived from both literature and real-world systems. The proposed model identifies the most efficient warehouses, which can serve as benchmarks for improving the performance of less efficient ones. After implementing PCA-DEA, only seven warehouses were identified as efficient. Subsequently, fixed and variable costs are identified as the two most important criteria. Results of the considered case study indicate that warehouse A4 emerges as the best one, whereas A6 is the least preferred warehouse. This research offers valuable insights and practical implications for organizations operating in dynamic markets, assisting them in achieving operational excellence and improving their supply chain performance.

Special Issue on Application of Fractional Calculus: Mathematical Modeling and Control - Part II

Open Access January 10, 2024

A study on a type of degenerate poly-Dedekind sums

Yuankui Ma, Lingling Luo, Taekyun Kim, Hongze Li, Wenpeng Zhang

Article number: 20230121

More Download PDF

Abstract

Dedekind sums and their generalizations are defined in terms of Bernoulli functions and their generalizations. As a new generalization of the Dedekind sums, the degenerate poly-Dedekind sums, which are obtained from the Dedekind sums by replacing Bernoulli functions by degenerate poly-Bernoulli functions of arbitrary indices are introduced in this article and are shown to satisfy a reciprocity relation.

Open Access November 22, 2024

Efficient scheme for a category of variable-order optimal control problems based on the sixth-kind Chebyshev polynomials

Khadijeh Sadri, Kamyar Hosseini, Soheil Salahshour, Dumitru Baleanu, Ali Ahmadian, Choonkil Park

Article number: 20240034

More Download PDF

Abstract

The main goal of the present study is to introduce an operational collocation scheme based on sixth-kind Chebyshev polynomials (SCPs) to solve a category of optimal control problems involving a variable-order dynamical system (VODS). To achieve this goal, the collocation method based on SCPs, the pseudo-operational matrix for the fractional integral operator, and the dual operational matrix are adopted. More precisely, an algebraic equation is obtained instead of the objective function and a system of algebraic equation is derived instead of the VODS. The constrained equations obtained from joining the objective function to the VODS are ultimately optimized using the method of the Lagrange multipliers. Detailed convergence analysis of the suggested method is given as well. Four illustrative examples along with several tables and figures are formally provided to support the efficiency and preciseness of the numerical scheme.

In the field of civil engineering education, accurately evaluating the effectiveness of budget courses is crucial. However, traditional methods of evaluation tend to be cumbersome and subjective. In recent years, machine learning technology has demonstrated immense potential in educational evaluation. Nevertheless, in practical application, the machine learning-based evaluation model for civil engineering budget courses faces the predicament of inadequate evaluation accuracy. To solve this problem, the squirrel search algorithm technology was used to establish support vector machine parameters and create optimization algorithms. The performance of the proposed optimization algorithm was tested, and the results showed that the accuracy of the proposed algorithm was 0.927, which was better than similar prediction algorithms. Then, the empirical analysis of the proposed civil engineering budget course evaluation model showed that student satisfaction and student examination scores had increased to 92 and 94 points, respectively. The above results reveal that the proposed optimization algorithm and course evaluation model have good performance. Therefore, the implementation of the proposed curriculum evaluation method can significantly improve the learning efficiency of students and the teaching quality of civil engineering budgeting methods courses.

In this study, we will express the 2-crossed module of groups from a higher-dimensional categorical perspective. According to simplicial homotopy theory, a 2-crossed module is the Moore complex of a 2-truncated simplicial group. Therefore, the 2-crossed module is an algebraic homotopy model for the homotopy 3-types. Tricategories are a three-dimensional generalization of the bicategory concept. Any tricategory is triequivalent to the Gray category, where Gray is a category enriched over the monoidal category 2Cat equipped with the Gray tensor product. Briefly, a Gray category is a semi-strict 3-category for homotopy 3-types. Naturally, the tricategory perspective is used in homotopy theory. The 2-crossed module is associated with the concept of the Gray category. The aim of this study is to obtain a single object tricategory from any 2-crossed module of groups.

In this article, we propose a novel integral transform coined as quaternion quadratic phase S-transform (Q-QPST), which is an extension of the quadratic phase S-transform and study the uncertainty principles associated with the Q-QPST. The Q-QPST possesses some desirable characteristics that are absent in conventional time-frequency transforms, especially for dealing with the time-varying quaternion-valued signals. First, we propose the definition of Q-QPST and then we explore some mathematical properties of the of quaternion Q-QPST, including the linearity, modulation, shift, orthogonality relation, and reconstruction formula. Second, we derive the associated Heisenberg’s uncertainty inequality and the corresponding logarithmic version for Q-QPST. Finally, an illustrative example and some potential applications of the Q-QPST are introduced.

The objective of this study is to determine the criteria under which the infinite system of integral equations in three variables has a solution in the Banach tempering sequence space c 0 β {c}_{0}^{\beta } and ℓ 1 β {\ell }_{1}^{\beta } , utilizing the Meir-Keeler condensing operators. Our research builds upon the findings of Malik and Jalal. Furthermore, we provide illustrative examples to demonstrate the implications of our established conditions.

In 2008, Cai and Jiu showed that the Cauchy problem of the Navier-Stokes equations, with damping α ∣ u ∣ β − 1 u \alpha {| u| }^{\beta -1}u for α > 0 \alpha \gt 0 and β ≥ 1 \beta \ge 1 has global weak solutions in L 2 ( R 3 ) {L}^{2}\left({{\mathbb{R}}}^{3}) . In this article, we study the uniqueness and the continuity in L 2 ( R 3 ) {L}^{2}\left({{\mathbb{R}}}^{3}) of this global weak solution. We also prove the large time decay for this global solution for β ≥ 10 3 \beta \ge \frac{10}{3} .

We prove the nonexistence of global solutions for the following wave equations with structural damping and nonlinear memory source term u t t + ( − Δ ) α 2 u + ( − Δ ) β 2 u t = ∫ 0 t ( t − s ) δ − 1 ∣ u ( s ) ∣ p d s {u}_{tt}+{\left(-\Delta )}^{\tfrac{\alpha }{2}}u+{\left(-\Delta )}^{\tfrac{\beta }{2}}{u}_{t}=\underset{0}{\overset{t}{\int }}{\left(t-s)}^{\delta -1}{| u\left(s)| }^{p}{\rm{d}}s and u t t + ( − Δ ) α 2 u + ( − Δ ) β 2 u t = ∫ 0 t ( t − s ) δ − 1 ∣ u s ( s ) ∣ p d s , {u}_{tt}+{\left(-\Delta )}^{\tfrac{\alpha }{2}}u+{\left(-\Delta )}^{\tfrac{\beta }{2}}{u}_{t}=\underset{0}{\overset{t}{\int }}{\left(t-s)}^{\delta -1}{| {u}_{s}\left(s)| }^{p}{\rm{d}}s, posed in ( x , t ) ∈ R N × [ 0 , ∞ ) \left(x,t)\in {{\mathbb{R}}}^{N}\times \left[0,\infty ) , where u = u ( x , t ) u=u\left(x,t) is the real-valued unknown function, p > 1 p\gt 1 , α , β ∈ ( 0 , 2 ) \alpha ,\beta \in \left(0,2) , δ ∈ ( 0 , 1 ) \delta \in \left(0,1) , by using the test function method under suitable sign assumptions on the initial data. Furthermore, we give an upper bound estimate of the life span of solutions.

We present and analyze two kinds of nonconforming finite element methods for three-field Biot’s consolidation model in poroelasticity. We employ the Crouzeix-Raviart element for one of the displacement component and conforming linear element for the remaining component, the lowest order Raviart-Thomas element (or the first-order Brezzi-Douglas-Marini element) for the fluid flux, and the piecewise constant for the pressure. We provide the corresponding analysis, including the well-posedness and a priori error estimates, for the fully discrete scheme coupled with the backward Euler finite difference for the time discretization. Such scheme ensures that the discrete Korn’s inequality is satisfied without adding any stabilization terms. In particular, it is free of poroelasticity locking. Numerical results are presented to compare the accuracy and locking-free performance of the two introduced schemes.

(Deutsch)

View latest issue

Type: Journal
Language: English
Publisher: De Gruyter Open Access
First published: January 1, 1969
Publication Frequency: 1 Issue per Year
Audience: Scientists, graduate students, and experts in mathematics.

Demonstratio Mathematica

On the p-fractional Schrödinger-Kirchhoff equations with electromagnetic fields and the Hardy-Littlewood-Sobolev nonlinearity

Abstract

L-Fuzzy fixed point results in ℱ -metric spaces with applications

Abstract

Solutions of a coupled system of hybrid boundary value problems with Riesz-Caputo derivative

Abstract

Nonparametric methods of statistical inference for double-censored data with applications

Abstract

LADM procedure to find the analytical solutions of the nonlinear fractional dynamics of partial integro-differential equations

Abstract

Existence of projected solutions for quasi-variational hemivariational inequality

Abstract

Spectral collocation method for convection-diffusion equation

Abstract

New local fractional Hermite-Hadamard-type and Ostrowski-type inequalities with generalized Mittag-Leffler kernel for generalized h-preinvex functions

Abstract

On the asymptotics of eigenvalues for a Sturm-Liouville problem with symmetric single-well potential

Abstract

On exact rate of convergence of row sequences of multipoint Hermite-Padé approximants

Abstract

The essential norm of bounded diagonal infinite matrices acting on Banach sequence spaces

Abstract

Decay rate of the solutions to the Cauchy problem of the Lord Shulman thermoelastic Timoshenko model with distributed delay

Abstract

Enhancing the accuracy and efficiency of two uniformly convergent numerical solvers for singularly perturbed parabolic convection–diffusion–reaction problems with two small parameters

Abstract

An inertial shrinking projection self-adaptive algorithm for solving split variational inclusion problems and fixed point problems in Banach spaces

Abstract

An equation for complex fractional diffusion created by the Struve function with a T-symmetric univalent solution

Abstract

On the existence and Ulam-Hyers stability for implicit fractional differential equation via fractional integral-type boundary conditions

Abstract

Some properties of a class of holomorphic functions associated with tangent function

Abstract

The existence of multiple solutions for a class of upper critical Choquard equation in a bounded domain

Abstract

On the continuity in q of the family of the limit q-Durrmeyer operators

Abstract

Results on solutions of several systems of the product type complex partial differential difference equations

Abstract

On Berezin norm and Berezin number inequalities for sum of operators

Abstract

Geometric invariants properties of osculating curves under conformal transformation in Euclidean space ℝ3

Abstract

On a generalization of the Opial inequality

Abstract

A novel numerical approach to solutions of fractional Bagley-Torvik equation fitted with a fractional integral boundary condition

Abstract

Holomorphic curves into projective spaces with some special hypersurfaces

Abstract

On Periodic solutions for implicit nonlinear Caputo tempered fractional differential problems

Abstract

Approximation of complex q-Beta-Baskakov-Szász-Stancu operators in compact disk

Abstract

Existence and regularity of solutions for non-autonomous integrodifferential evolution equations involving nonlocal conditions

Abstract

Jordan left derivations in infinite matrix rings

Abstract

Nonlinear nonlocal elliptic problems in ℝ3: existence results and qualitative properties

Abstract

Invariant means and lacunary sequence spaces of order (α, β)

Abstract

Novel results for two families of multivalued dominated mappings satisfying generalized nonlinear contractive inequalities and applications

Abstract

Global in time well-posedness of a three-dimensional periodic regularized Boussinesq system

Abstract

Existence of solutions for nonlinear problems involving mixed fractional derivatives with p(x)-Laplacian operator

Abstract

Some applications and maximum principles for multi-term time-space fractional parabolic Monge-Ampère equation

Abstract

On three-dimensional q-Riordan arrays

Abstract

Some aspects of normal curve on smooth surface under isometry

Abstract

Mittag-Leffler-Hyers-Ulam stability for a first- and second-order nonlinear differential equations using Fourier transform

Geometric invariants properties of osculating curves under conformal transformation in Euclidean space ℝ³

Nonlinear nonlocal elliptic problems in ℝ³: existence results and qualitative properties