PSR Press – Page 53

On Prime number varieties and their applications

EASL-Vol. 3 (2020), Issue 3, pp. 30 – 36 Open Access Full-Text PDF

Y. Gayathri Narayana, V. Yegnanarayanan

Abstract: Prime numbers and their variations are extremely useful in applied research areas such as cryptography, feedback and control in engineering. In this paper we discuss about prime numbers, perfect numbers, even perfect and odd perfect numbers, amicable numbers, semiprimes, mersenne prime numbers, triangular numbers, distribution of primes, relation between

π

$\pi$ and prime numbers. In the process we also obtain interesting properties of some of them and raise a set of open problems for further exploration.

Block procedure for solving stiff initial value problems using probabilists Hermite polynomials

EASL-Vol. 3 (2020), Issue 3, pp. 20 – 29 Open Access Full-Text PDF

Lelise Mulatu, Alemayehu Shiferaw, Solomon Gebregiorgis

Abstract: In this paper, a block linear multistep method (LMM) with step number 4

(k = 4)

$(k = 4)$ through collocation and interpolation techniques using probabilists Hermite polynomial as basis function which produces a family of block scheme with maximum order five has been proposed for the numerical solution of stiff problems in ODEs. The method is found to be consistent, convergent, and zero stable.The accuracy of the method is tested with two stiff first order initial value problems. The results are compared with fourth order Runge Kutta (RK4) method and a block LMM developed by Berhan et al. [1]. All numerical examples are solved with the aid of MATLAB software after the schemes are developed using MAPLE software.

On some properties of generalized Fibonacci polynomials

ODAM-Vol. 3 (2020), Issue 3, pp. 4 – 13 Open Access Full-Text PDF

Fidel Oduol

Abstract: Fibonacci polynomials have been generalized mainly by two ways: by maintaining the recurrence relation and varying the initial conditions and by varying the recurrence relation and maintaining the initial conditions. In this paper, both the recurrence relation and initial conditions of generalized Fibonacci polynomials are varied and defined by recurrence relation as

R_{n} (x) = a x R_{n - 1} (x) + b R_{n - 2} (x)

$R_n(x)=axR_{n-1}(x)+bR_{n-2}(x)$ for all

n \geq 2,

$n\geq2,$ with initial conditions

R_{0} (x) = 2 p

$R_0(x)=2p$ and

R_{1} (x) = p x + q

$R_1(x)=px+q$ where

a

$a$ and

b

$b$ are positive integers and

p

$p$ and

q

$q$ are non-negative integers. Further some fundamental properties of these generalized polynomials such as explicit sum formula, sum of first

n

$n$ terms, sum of first

n

$n$ terms with (odd or even) indices and generalized identity are derived by Binet’s formula and generating function only.

Degree tolerant number of power graph: finite Albenian group

ODAM-Vol. 3 (2020), Issue 3, pp. 1 – 3 Open Access Full-Text PDF

Johan Kok

Abstract: The degree tolerant number of the power graph of the finite Albenian group,

Z_{n}

$\mathbb{Z}_n$ under addition modulo

n

$n$ ,

n \in N

$n\in \mathbb{N}$ is investigated. A surprising simple result,

χ_{d t} (P ((Z_{n}, +_{n}))) = k

$\chi_{dt}(\mathcal{P}((\mathbb{Z}_{n},+_{n}))) = k$ for the product of primes,

n = p_{1} p_{2} p_{3} \dots p_{k}

$n=p_1p_2p_3\cdots p_k$ is presented.

Boundedness of Calderón-Zygmund operators and their commutator on Morrey-Herz Spaces with variable exponents

OMS-Vol. 4 (2020), Issue 1, pp. 323 – 336 Open Access Full-Text PDF

Omer Abdalrhman, Afif Abdalmonem, Shuangping Tao

Abstract: In this paper, the boundedness of Calderón-Zygmund operators is obtained on Morrey-Herz spaces with variable exponents

M K_{q (\cdot), p (\cdot)}^{α (\cdot), λ} (R^{n})

$MK_{q(\cdot),p(\cdot)}^{\alpha(\cdot),\lambda}(\mathbb{R}^{n})$ and several norm inequalities for the commutator generated by Calderón-Zygmund operators, BMO function and Lipschitz function are given.

COVID-19, a brief overview of virus reproductive emergent behavior

EASL-Vol. 3 (2020), Issue 3, pp. 15 – 19 Open Access Full-Text PDF

Charles Roberto Telles

Abstract: Researches were investigated from January to March,

2020

$2020$ , searching for empirical evidences and theoretical approaches at that time to determine a mathematical modeling for COVID-

19

$19$ transmission for individual/community infection. It was found that despite traditional forms of transmission of the virus SARS-COV-

2

$2$ through SIR model equations early detected on

2020

$2020$ , empirical evidences suggested the use of more dynamic mathematical modeling aspects for this equation in order to estimate the disease spreading patterns. The SIR equation modeling limitations were found as far as common epidemic preventive methods did not explain effectively the spreading patterns of disease transmission due to the virus association with the human emergent behavior in a complex network model.

A linear algorithm for minimum dominator colorings of orientations of paths

EASL-Vol. 3 (2020), Issue 3, pp. 10 – 14 Open Access Full-Text PDF

Michael Cary

Abstract: In this paper we present an algorithm for finding a minimum dominator coloring of orientations of paths. To date this is the first algorithm for dominator colorings of digraphs in any capacity. We prove that the algorithm always provides a minimum dominator coloring of an oriented path and show that it runs in

O (n)

$\mathcal{O}(n)$ time. The algorithm is available at https://github.com/cat-astrophic/MDC-orientations_of_paths/.

Magneto-squeezing flow and heat transfer analyses of third grade fluid between two disks embedded in a porous medium using Chebyshev spectral collocation method

OMS-Vol. 4 (2020), Issue 1, pp. 305 – 322 Open Access Full-Text PDF

M. G. Sobamowo, O. M. Kamiyo, A. A. Yinusa, T. A. Akinshilo

Abstract: The present study is based on the nonlinear analysis of unsteady magnetohydrodynamics squeezing flow and heat transfer of a third grade fluid between two parallel disks embedded in a porous medium under the influences of thermal radiation and temperature jump boundary conditions are studied using Chebyshev spectral collocation method. The results of the non-convectional numerical solutions verified with the results of numerical solutions using fifth-order Runge-Kutta Fehlberg-shooting method and also the results of homotopy analysis method as presented in literature. The parametric studies from the series solutions show that for a suction parameter greater than zero, the radial velocity of the lower disc increases while that of the upper disc decreases as a result of a corresponding increase in the viscosity of the fluid from the lower squeezing disc to the upper disc. An increasing magnetic field parameter, the radial velocity of the lower disc decreases while that of the upper disc increases. As the third-grade fluid parameter increases, there is a reduction in the fluid viscosity thereby increasing resistance between the fluid molecules. There is a recorded decrease in the fluid temperature profile as the Prandtl number increases due to decrease in the thermal diffusivity of the third-grade fluid. The results in this work can be used to advance the analysis and study of the behaviour of third grade fluid flow and heat transfer processes such as found in coal slurries, polymer solutions, textiles, ceramics, catalytic reactors, oil recovery applications etc.

Concerning the Navier-Stokes problem

OMA-Vol. 4 (2020), Issue 2, pp. 89 – 92 Open Access Full-Text PDF

Alexander G. Ramm

Abstract: The problem discussed is the Navier-Stokes problem (NSP) in

R^{3}

$\mathbb{R}^3$ . Uniqueness of its solution is proved in a suitable space

X

$X$ . No smallness assumptions are used in the proof. Existence of the solution in

X

$X$ is proved for

t \in [0, T]

$t\in [0,T]$ , where

T > 0

$T>0$ is sufficiently small. Existence of the solution in

X

$X$ is proved for

t \in [0, \infty)

$t\in [0,\infty)$ if some a priori estimate of the solution holds.

On centre properties of irreducible subalgebras of compact elementary operators

OMA-Vol. 4 (2020), Issue 2, pp. 80 – 88 Open Access Full-Text PDF

W. Kangogo, N. B. Okelo, O. Ongati

Abstract: In this paper, we characterize the centre of dense irreducible subalgebras of compact elementary operators that are spectrally bounded. We show that the centre is a unital, irreducible and commutative

C^{*}

$C^{*}$ -subalgebra. Furthermore, the supports from the centre are orthogonal and the intersection of a nonzero ideal with the centre is non-zero.

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