Mathematics

Editorial

Jump to: Research

4 pages, 165 KiB

Open AccessEditorial

Fractional-Order Integral and Derivative Operators and Their Applications

by Hari Mohan Srivastava

Mathematics 2020, 8(6), 1016; https://doi.org/10.3390/math8061016 - 22 Jun 2020

Cited by 7 | Viewed by 2544

Abstract

The present volume contains the invited, accepted and published submissions (see [...] Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

Research

Jump to: Editorial

7 pages, 229 KiB

Open AccessArticle

Abstract Formulation of the Miura Transform

by Yoritaka Iwata

Mathematics 2020, 8(5), 747; https://doi.org/10.3390/math8050747 - 8 May 2020

Cited by 4 | Viewed by 2362

Abstract

Miura transform is known as the transformation between Korweg de-Vries equation and modified Korweg de-Vries equation. Its formal similarity to the Cole-Hopf transform has been noticed. This fact sheds light on the logarithmic type transformations as an origin of a certain kind of [...] Read more.

Miura transform is known as the transformation between Korweg de-Vries equation and modified Korweg de-Vries equation. Its formal similarity to the Cole-Hopf transform has been noticed. This fact sheds light on the logarithmic type transformations as an origin of a certain kind of nonlinearity in the soliton equations. In this article, based on the logarithmic representation of operators in infinite-dimensional Banach spaces, a structure common to both Miura and Cole-Hopf transforms is discussed. In conclusion, the Miura transform is generalized as the transform in abstract Banach spaces, and it is applied to the higher order abstract evolution equations. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

21 pages, 866 KiB

Open AccessArticle

Stability Results for Implicit Fractional Pantograph Differential Equations via ϕ-Hilfer Fractional Derivative with a Nonlocal Riemann-Liouville Fractional Integral Condition

by Idris Ahmed, Poom Kumam, Kamal Shah, Piyachat Borisut, Kanokwan Sitthithakerngkiet and Musa Ahmed Demba

Mathematics 2020, 8(1), 94; https://doi.org/10.3390/math8010094 - 7 Jan 2020

Cited by 55 | Viewed by 4034

Abstract

This paper presents a class of implicit pantograph fractional differential equation with more general Riemann-Liouville fractional integral condition. A certain class of generalized fractional derivative is used to set the problem. The existence and uniqueness of the problem is obtained using Schaefer’s and [...] Read more.

This paper presents a class of implicit pantograph fractional differential equation with more general Riemann-Liouville fractional integral condition. A certain class of generalized fractional derivative is used to set the problem. The existence and uniqueness of the problem is obtained using Schaefer’s and Banach fixed point theorems. In addition, the Ulam-Hyers and generalized Ulam-Hyers stability of the problem are established. Finally, some examples are given to illustrative the results. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

11 pages, 238 KiB

Open AccessArticle

Absence of Global Solutions for a Fractional in Time and Space Shallow-Water System

by Mohamed Jleli, Mokhtar Kirane and Bessem Samet

Mathematics 2019, 7(11), 1127; https://doi.org/10.3390/math7111127 - 18 Nov 2019

Cited by 2 | Viewed by 2006

Abstract

An initial boundary value problem for a fractional in time and space shallow-water system involving

ψ

-Caputo fractional derivatives of different orders is considered. Using the test function method, sufficient criteria for the absence of global in time solutions of the system are [...] Read more.

An initial boundary value problem for a fractional in time and space shallow-water system involving

ψ

-Caputo fractional derivatives of different orders is considered. Using the test function method, sufficient criteria for the absence of global in time solutions of the system are obtained. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

16 pages, 1255 KiB

Open AccessArticle

Fractional Order Unknown Inputs Fuzzy Observer for Takagi–Sugeno Systems with Unmeasurable Premise Variables

by Abdelghani Djeddi, Djalel Dib, Ahmad Taher Azar and Salem Abdelmalek

Mathematics 2019, 7(10), 984; https://doi.org/10.3390/math7100984 - 16 Oct 2019

Cited by 30 | Viewed by 3485

Abstract

This paper presents a new procedure for designing a fractional order unknown input observer (FOUIO) for nonlinear systems represented by a fractional-order Takagi–Sugeno (FOTS) model with unmeasurable premise variables (UPV). Most of the current research on fractional order systems considers models using measurable [...] Read more.

This paper presents a new procedure for designing a fractional order unknown input observer (FOUIO) for nonlinear systems represented by a fractional-order Takagi–Sugeno (FOTS) model with unmeasurable premise variables (UPV). Most of the current research on fractional order systems considers models using measurable premise variables (MPV) and therefore cannot be utilized when premise variables are not measurable. The concept of the proposed is to model the FOTS with UPV into an uncertain FOTS model by presenting the estimated state in the model. First, the fractional-order extension of Lyapunov theory is used to investigate the convergence conditions of the FOUIO, and the linear matrix inequalities (LMIs) provide the stability condition. Secondly, performances of the proposed FOUIO are improved by the reduction of bounded external disturbances. Finally, an example is provided to clarify the proposed method. The obtained results show that a good convergence of the outputs and the state estimation errors were observed using the new proposed FOUIO. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

16 pages, 308 KiB

Open AccessArticle

q-Analogue of Differential Subordinations

by Miraj Ul-Haq, Mohsan Raza, Muhammad Arif, Qaiser Khan and Huo Tang

Mathematics 2019, 7(8), 724; https://doi.org/10.3390/math7080724 - 9 Aug 2019

Cited by 27 | Viewed by 3042

Abstract

In this article, we study differential subordnations in q-analogue. Some properties of analytic functions in q-analogue associated with cardioid domain and limacon domain are considered. In particular, we determine conditions on

α

such that [...] Read more.

In this article, we study differential subordnations in q-analogue. Some properties of analytic functions in q-analogue associated with cardioid domain and limacon domain are considered. In particular, we determine conditions on

α

such that

1 + α \frac{z \partial_{q} h (z)}{{(h (z))}^{n}} (n = 0, 1, 2, 3)

are subordinated by Janowski functions and

h (z) ≺ 1 + \frac{4}{3} z + \frac{2}{3} z^{2} .

We also consider the same implications such that

h (z) ≺ 1 + \sqrt{2} z + \frac{1}{2} z^{2}

. We apply these results on analytic functions to find sufficient conditions for q-starlikeness related with cardioid and limacon. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

12 pages, 261 KiB

Open AccessArticle

Properties of Spiral-Like Close-to-Convex Functions Associated with Conic Domains

by Hari M. Srivastava, Nazar Khan, Maslina Darus, Muhammad Tariq Rahim, Qazi Zahoor Ahmad and Yousra Zeb

Mathematics 2019, 7(8), 706; https://doi.org/10.3390/math7080706 - 6 Aug 2019

Cited by 21 | Viewed by 3099

Abstract

In this paper, our aim is to define certain new classes of multivalently spiral-like, starlike, convex and the varied Mocanu-type functions, which are associated with conic domains. We investigate such interesting properties of each of these function classes, such as (for example) sufficiency [...] Read more.

In this paper, our aim is to define certain new classes of multivalently spiral-like, starlike, convex and the varied Mocanu-type functions, which are associated with conic domains. We investigate such interesting properties of each of these function classes, such as (for example) sufficiency criteria, inclusion results and integral-preserving properties. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

16 pages, 1056 KiB

Open AccessArticle

Efficacy of the Post-Exposure Prophylaxis and of the HIV Latent Reservoir in HIV Infection

by Carla M. A. Pinto, Ana R. M. Carvalho, Dumitru Baleanu and Hari M. Srivastava

Mathematics 2019, 7(6), 515; https://doi.org/10.3390/math7060515 - 5 Jun 2019

Cited by 13 | Viewed by 5816

Abstract

We propose a fractional order model to study the efficacy of the Post-Exposure Prophylaxis (PEP) in human immunodeficiency virus (HIV) within-host dynamics, in the presence of the HIV latent reservoir. Latent reservoirs harbor infected cells that contain a transcriptionally silent but reactivatable provirus. [...] Read more.

We propose a fractional order model to study the efficacy of the Post-Exposure Prophylaxis (PEP) in human immunodeficiency virus (HIV) within-host dynamics, in the presence of the HIV latent reservoir. Latent reservoirs harbor infected cells that contain a transcriptionally silent but reactivatable provirus. The latter constitutes a major difficulty to the eradication of HIV in infected patients. PEP is used as a way to prevent HIV infection after a recent possible exposure to HIV. It consists of the in-take of antiretroviral drugs for, usually, 28 days. In this study, we focus on the dosage and dosage intervals of antiretroviral therapy (ART) during PEP and in the role of the latent reservoir in HIV infected patients. We thus simulate the model for immunologically important parameters concerning the drugs and the fraction of latently infected cells. The results may add important information to clinical practice of HIV infected patients. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

15 pages, 3234 KiB

Open AccessArticle

Impact of Fractional Calculus on Correlation Coefficient between Available Potassium and Spectrum Data in Ground Hyperspectral and Landsat 8 Image

by Chengbiao Fu, Shu Gan, Xiping Yuan, Heigang Xiong and Anhong Tian

Mathematics 2019, 7(6), 488; https://doi.org/10.3390/math7060488 - 28 May 2019

Cited by 12 | Viewed by 3289

Abstract

As the level of potassium can interfere with the normal circulation process of biosphere materials, the available potassium is an important index to measure the ability of soil to supply potassium to crops. There are rarely studies on the inversion of available potassium [...] Read more.

As the level of potassium can interfere with the normal circulation process of biosphere materials, the available potassium is an important index to measure the ability of soil to supply potassium to crops. There are rarely studies on the inversion of available potassium content using ground hyperspectral remote sensing and Landsat 8 multispectral satellite data. Pretreatment of saline soil field hyperspectral data based on fractional differential has rarely been reported, and the corresponding relationship between spectrum and available potassium content has not yet been reported. Because traditional integer-order differential preprocessing methods ignore important spectral information at fractional-order, it is easy to reduce the accuracy of inversion model. This paper explores spectral preprocessing effect based on Grünwald–Letnikov fractional differential (order interval is 0.2) between zero-order and second-order. Field spectra of saline soil were collected in Fukang City of Xinjiang. The maximum absolute of correlation coefficient between ground hyperspectral reflectance and available potassium content for five mathematical transformations appears in the fractional-order. We also studied the tendency of correlation coefficient under different fractional-order based on seven bands corresponding to the Landsat 8 image. We found that fractional derivative can significantly improve the correlation, and the maximum absolute of correlation coefficient under five spectral transformations is in Band 2, which is 0.715766 for the band at 467 nm. This study deeply mined the potential information of spectra and made up for the gap of fractional differential for field hyperspectral data, providing a new perspective for field hyperspectral technology to monitor the content of soil available potassium. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

10 pages, 270 KiB

Open AccessArticle

Some New Fractional-Calculus Connections between Mittag–Leffler Functions

by Hari M. Srivastava, Arran Fernandez and Dumitru Baleanu

Mathematics 2019, 7(6), 485; https://doi.org/10.3390/math7060485 - 28 May 2019

Cited by 44 | Viewed by 5047

Abstract

We consider the well-known Mittag–Leffler functions of one, two and three parameters, and establish some new connections between them using fractional calculus. In particular, we express the three-parameter Mittag–Leffler function as a fractional derivative of the two-parameter Mittag–Leffler function, which is in turn [...] Read more.

We consider the well-known Mittag–Leffler functions of one, two and three parameters, and establish some new connections between them using fractional calculus. In particular, we express the three-parameter Mittag–Leffler function as a fractional derivative of the two-parameter Mittag–Leffler function, which is in turn a fractional integral of the one-parameter Mittag–Leffler function. Hence, we derive an integral expression for the three-parameter one in terms of the one-parameter one. We discuss the importance and applications of all three Mittag–Leffler functions, with a view to potential applications of our results in making certain types of experimental data much easier to analyse. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

18 pages, 300 KiB

Open AccessArticle

Some Incomplete Hypergeometric Functions and Incomplete Riemann-Liouville Fractional Integral Operators

by Mehmet Ali Özarslan and Ceren Ustaoğlu

Mathematics 2019, 7(5), 483; https://doi.org/10.3390/math7050483 - 27 May 2019

Cited by 23 | Viewed by 3378

Abstract

Very recently, the incomplete Pochhammer ratios were defined in terms of the incomplete beta function

B_{y} (x, z)

. With the help of these incomplete Pochhammer ratios, we introduce new incomplete Gauss, confluent hypergeometric, and Appell’s functions and investigate [...] Read more.

Very recently, the incomplete Pochhammer ratios were defined in terms of the incomplete beta function

B_{y} (x, z)

. With the help of these incomplete Pochhammer ratios, we introduce new incomplete Gauss, confluent hypergeometric, and Appell’s functions and investigate several properties of them such as integral representations, derivative formulas, transformation formulas, and recurrence relations. Furthermore, incomplete Riemann-Liouville fractional integral operators are introduced. This definition helps us to obtain linear and bilinear generating relations for the new incomplete Gauss hypergeometric functions. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

12 pages, 749 KiB

Open AccessArticle

Logarithmic Coefficients for Univalent Functions Defined by Subordination

by Ebrahim Analouei Adegani, Nak Eun Cho and Mostafa Jafari

Mathematics 2019, 7(5), 408; https://doi.org/10.3390/math7050408 - 7 May 2019

Cited by 24 | Viewed by 3483

Abstract

In this work, the bounds for the logarithmic coefficients

γ_{n}

of the general classes

S^{*} (φ)

and

K (φ)

were estimated. It is worthwhile mentioning that the given bounds would generalize some of the previous papers. Some [...] Read more.

In this work, the bounds for the logarithmic coefficients

γ_{n}

of the general classes

S^{*} (φ)

and

K (φ)

were estimated. It is worthwhile mentioning that the given bounds would generalize some of the previous papers. Some consequences of the main results are also presented, noting that our method is more general than those used by others. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

10 pages, 249 KiB

Open AccessArticle

Third-Order Hankel and Toeplitz Determinants for Starlike Functions Connected with the Sine Function

by Hai-Yan Zhang, Rekha Srivastava and Huo Tang

Mathematics 2019, 7(5), 404; https://doi.org/10.3390/math7050404 - 6 May 2019

Cited by 26 | Viewed by 3029

Abstract

Let

S_{s}^{*}

be the class of normalized functions f defined in the open unit disk

D = {z : | z | < 1}

such that the quantity

\frac{z f^{'} (z)}{f (z)}

lies [...] Read more.

Let

S_{s}^{*}

be the class of normalized functions f defined in the open unit disk

D = {z : | z | < 1}

such that the quantity

\frac{z f^{'} (z)}{f (z)}

lies in an eight-shaped region in the right-half plane and satisfying the condition

\frac{z f^{'} (z)}{f (z)} ≺ 1 + sin z (z \in D) .

In this paper, we aim to investigate the third-order Hankel determinant

H_{3} (1)

and Toeplitz determinant

T_{3} (2)

for this function class

S_{s}^{*}

associated with sine function and obtain the upper bounds of the determinants

H_{3} (1)

and

T_{3} (2)

. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

23 pages, 802 KiB

Open AccessArticle

Unique Existence Result of Approximate Solution to Initial Value Problem for Fractional Differential Equation of Variable Order Involving the Derivative Arguments on the Half-Axis

by Shuqin Zhang and Lei Hu

Mathematics 2019, 7(3), 286; https://doi.org/10.3390/math7030286 - 20 Mar 2019

Cited by 31 | Viewed by 2833

Abstract

The semigroup properties of the Riemann–Liouville fractional integral have played a key role in dealing with the existence of solutions to differential equations of fractional order. Based on some results of some experts’, we know that the Riemann–Liouville variable order fractional integral does [...] Read more.

The semigroup properties of the Riemann–Liouville fractional integral have played a key role in dealing with the existence of solutions to differential equations of fractional order. Based on some results of some experts’, we know that the Riemann–Liouville variable order fractional integral does not have semigroup property, thus the transform between the variable order fractional integral and derivative is not clear. These judgments bring us extreme difficulties in considering the existence of solutions of variable order fractional differential equations. In this work, we will introduce the concept of approximate solution to an initial value problem for differential equations of variable order involving the derivative argument on half-axis. Then, by our discussion and analysis, we investigate the unique existence of approximate solution to this initial value problem for differential equation of variable order involving the derivative argument on half-axis. Finally, we give examples to illustrate our results. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

15 pages, 267 KiB

Open AccessArticle

Random Coupled Hilfer and Hadamard Fractional Differential Systems in Generalized Banach Spaces

by Saïd Abbas, Nassir Al Arifi, Mouffak Benchohra and Yong Zhou

Mathematics 2019, 7(3), 285; https://doi.org/10.3390/math7030285 - 20 Mar 2019

Cited by 12 | Viewed by 2925

Abstract

This article deals with some existence and uniqueness result of random solutions for some coupled systems of Hilfer and Hilfer–Hadamard fractional differential equations with random effects. Some applications are made of generalizations of classical random fixed point theorems on generalized Banach spaces. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

20 pages, 792 KiB

Open AccessArticle

On the Solvability of a Mixed Problem for a High-Order Partial Differential Equation with Fractional Derivatives with Respect to Time, with Laplace Operators with Spatial Variables and Nonlocal Boundary Conditions in Sobolev Classes

by Onur Alp İlhan, Shakirbay G. Kasimov, Shonazar Q. Otaev and Haci Mehmet Baskonus

Mathematics 2019, 7(3), 235; https://doi.org/10.3390/math7030235 - 5 Mar 2019

Cited by 5 | Viewed by 2582

Abstract

In this paper, we study the solvability of a mixed problem for a high-order partial differential equation with fractional derivatives with respect to time, and with Laplace operators with spatial variables and nonlocal boundary conditions in Sobolev classes. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

24 pages, 5440 KiB

Open AccessEditor’s ChoiceArticle

Solving Non-Linear Fractional Variational Problems Using Jacobi Polynomials

by Harendra Singh, Rajesh K. Pandey and Hari Mohan Srivastava

Mathematics 2019, 7(3), 224; https://doi.org/10.3390/math7030224 - 27 Feb 2019

Cited by 43 | Viewed by 3854

Abstract

The aim of this paper is to solve a class of non-linear fractional variational problems (NLFVPs) using the Ritz method and to perform a comparative study on the choice of different polynomials in the method. The Ritz method has allowed many researchers to [...] Read more.

The aim of this paper is to solve a class of non-linear fractional variational problems (NLFVPs) using the Ritz method and to perform a comparative study on the choice of different polynomials in the method. The Ritz method has allowed many researchers to solve different forms of fractional variational problems in recent years. The NLFVP is solved by applying the Ritz method using different orthogonal polynomials. Further, the approximate solution is obtained by solving a system of nonlinear algebraic equations. Error and convergence analysis of the discussed method is also provided. Numerical simulations are performed on illustrative examples to test the accuracy and applicability of the method. For comparison purposes, different polynomials such as 1) Shifted Legendre polynomials, 2) Shifted Chebyshev polynomials of the first kind, 3) Shifted Chebyshev polynomials of the third kind, 4) Shifted Chebyshev polynomials of the fourth kind, and 5) Gegenbauer polynomials are considered to perform the numerical investigations in the test examples. Further, the obtained results are presented in the form of tables and figures. The numerical results are also compared with some known methods from the literature. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

16 pages, 311 KiB

Open AccessFeature PaperArticle

Approximate Controllability of Sub-Diffusion Equation with Impulsive Condition

by Lakshman Mahto, Syed Abbas, Mokhtar Hafayed and Hari M. Srivastava

Mathematics 2019, 7(2), 190; https://doi.org/10.3390/math7020190 - 17 Feb 2019

Cited by 15 | Viewed by 3110

Abstract

In this work, we study an impulsive sub-diffusion equation as a fractional diffusion equation of order

α \in (0, 1)

. Existence, uniqueness and regularity of solution of the problem is established via eigenfunction expansion. Moreover, we establish the approximate [...] Read more.

In this work, we study an impulsive sub-diffusion equation as a fractional diffusion equation of order

α \in (0, 1)

. Existence, uniqueness and regularity of solution of the problem is established via eigenfunction expansion. Moreover, we establish the approximate controllability of the problem by applying a unique continuation property via internal control which acts on a sub-domain. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

9 pages, 728 KiB

Open AccessArticle

The Extremal Solution To Conformable Fractional Differential Equations Involving Integral Boundary Condition

by Shuman Meng and Yujun Cui

Mathematics 2019, 7(2), 186; https://doi.org/10.3390/math7020186 - 16 Feb 2019

Cited by 29 | Viewed by 3456

Abstract

In this article, by using the monotone iterative technique coupled with the method of upper and lower solution, we obtain the existence of extremal iteration solutions to conformable fractional differential equations involving Riemann-Stieltjes integral boundary conditions. At the same time, the comparison principle [...] Read more.

In this article, by using the monotone iterative technique coupled with the method of upper and lower solution, we obtain the existence of extremal iteration solutions to conformable fractional differential equations involving Riemann-Stieltjes integral boundary conditions. At the same time, the comparison principle of solving such problems is investigated. Finally, an example is given to illustrate our main results. It should be noted that the conformal fractional derivative is essentially a modified version of the first-order derivative. Our results show that such known results can be translated and stated in the setting of the so-called conformal fractional derivative. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

15 pages, 280 KiB

Open AccessEditor’s ChoiceArticle

Hankel and Toeplitz Determinants for a Subclass of q-Starlike Functions Associated with a General Conic Domain

by Hari M. Srivastava, Qazi Zahoor Ahmad, Nasir Khan, Nazar Khan and Bilal Khan

Mathematics 2019, 7(2), 181; https://doi.org/10.3390/math7020181 - 15 Feb 2019

Cited by 111 | Viewed by 3929

Abstract

By using a certain general conic domain as well as the quantum (or q-) calculus, here we define and investigate a new subclass of normalized analytic and starlike functions in the open unit disk

U

. In particular, we find the Hankel [...] Read more.

By using a certain general conic domain as well as the quantum (or q-) calculus, here we define and investigate a new subclass of normalized analytic and starlike functions in the open unit disk

U

. In particular, we find the Hankel determinant and the Toeplitz matrices for this newly-defined class of analytic q-starlike functions. We also highlight some known consequences of our main results. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

11 pages, 789 KiB

Open AccessArticle

A Hermite Polynomial Approach for Solving the SIR Model of Epidemics

by Aydin Secer, Neslihan Ozdemir and Mustafa Bayram

Mathematics 2018, 6(12), 305; https://doi.org/10.3390/math6120305 - 5 Dec 2018

Cited by 15 | Viewed by 4592

Abstract

In this paper, the problem of the spread of a non-fatal disease in a population is solved by using the Hermite collocation method. Mathematical modeling of the problem corresponds to a three-dimensional system of nonlinear ODEs. The presented scheme reduces the problem to [...] Read more.

In this paper, the problem of the spread of a non-fatal disease in a population is solved by using the Hermite collocation method. Mathematical modeling of the problem corresponds to a three-dimensional system of nonlinear ODEs. The presented scheme reduces the problem to a nonlinear algebraic equation system by expanding the approximate solutions by using Hermite polynomials with unknown coefficients. These coefficients of the Hermite polynomials are computed by using the matrix operations of derivatives together with the collocation method. Maple software is used to carry out the computations. In addition, comparison of our method with the Homotopy perturbation method (HPM) and Laplece-Adomian decomposition method (LADM) proves accuracy of solution. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

8 pages, 747 KiB

Open AccessArticle

On a Length Problem for Univalent Functions

by Mamoru Nunokawa, Janusz Sokół and Nak Eun Cho

Mathematics 2018, 6(11), 266; https://doi.org/10.3390/math6110266 - 19 Nov 2018

Cited by 2 | Viewed by 2665

Abstract

Let g be an analytic function with the normalization in the open unit disk. Let

L (r)

be the length of

g ({z : | z | = r})

. In this paper we present a correspondence [...] Read more.

Let g be an analytic function with the normalization in the open unit disk. Let

L (r)

be the length of

g ({z : | z | = r})

. In this paper we present a correspondence between g and

L (r)

for the case when g is not necessary univalent. Furthermore, some other results related to the length of analytic functions are also discussed. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

16 pages, 1290 KiB

Open AccessArticle

A New Operational Matrix of Fractional Derivatives to Solve Systems of Fractional Differential Equations via Legendre Wavelets

by Aydin Secer and Selvi Altun

Mathematics 2018, 6(11), 238; https://doi.org/10.3390/math6110238 - 5 Nov 2018

Cited by 17 | Viewed by 4292

Abstract

This paper introduces a new numerical approach to solving a system of fractional differential equations (FDEs) using the Legendre wavelet operational matrix method (LWOMM). We first formulated the operational matrix of fractional derivatives in some special conditions using some notable characteristics of Legendre [...] Read more.

This paper introduces a new numerical approach to solving a system of fractional differential equations (FDEs) using the Legendre wavelet operational matrix method (LWOMM). We first formulated the operational matrix of fractional derivatives in some special conditions using some notable characteristics of Legendre wavelets and shifted Legendre polynomials. Then, the system of fractional differential equations was transformed into a system of algebraic equations by using these operational matrices. At the end of this paper, several examples are presented to illustrate the effectivity and correctness of the proposed approach. Comparing the methodology with several recognized methods demonstrates that the advantages of the Legendre wavelet operational matrix method are its accuracy and the understandability of the calculations. Full article

(This article belongs to the Special Issue Fractional-Order Integral and Derivative Operators and Their Applications)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Fractional-Order Integral and Derivative Operators and Their Applications

Share This Special Issue

Special Issue Editor

Special Issue Information

Keywords

Benefits of Publishing in a Special Issue

Published Papers (23 papers)

Editorial

Research

Further Information

Guidelines

MDPI Initiatives

Follow MDPI