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Jun 16, 2025Open    Access

Research on Rational Quadratic Residues

Zhongqi Zhou
This paper introduces the concept of rational quadratic residues, namely fractional quadratic residues. It also presents a method for determining quadratic residues with fractions as moduli, as well as computational symbols for rational quadratic residues and formulas for converting rational Legendre symbols to general Legendre symbols. Formulas for calculating the number of rational quadratic residues and rational quadratic non-residues are derived. Additionally, several practical application e...
Open Access Library J.   Vol.12, 2025
Doi:10.4236/oalib.1113565


Apr 24, 2025Open    Access

Semi-Primitive Roots and Information Security

Zhongqi Zhou
In this paper, a new concept is proposed: semi-primitive root. The basic theory system of semi-primal roots is established, and the congruence equations and propositions of indefinite equations are solved by the theory of semi-primal roots. The security problem of using the same value to digitally sign multiple different information in discrete logarithm encryption is solved.
Open Access Library J.   Vol.12, 2025
Doi:10.4236/oalib.1113181


Feb 26, 2025Open    Access

Multiway Generalization of Euler Proposition

Zhongqi Zhou
In this paper, the multiway extension of the Euler proposition is presented. By means of inductive reasoning, it is proved that there are positive integer solutions to five kind of indefinite equations, and the uniqueness of the solution of the indefinite equations in these propositions is demonstrated. Three related conjectures are proposed. Finally, the general method to understand these indeterminate equations is pointed out. 
Open Access Library J.   Vol.12, 2025
Doi:10.4236/oalib.1112789


Sep 27, 2024Open    Access

A Proof of a Conjecture and Twenty-Five Conjectures in Number Theory

Zhongqi Zhou
1) Fermat has proved that x4 y4=z2   has no positive integer solution, and in 2011, J. Cullen [1] reported that x,y,∈{0,1,...,107}, x4 y4 1 is not a square greater than 1, and conjecture:x4 y4 1≠z2,z∈{2,3,...},x,y,∈{0,1,...}. On May 15, 2021, Sun Zhiwei [2] proposed that neither x4 y4 1(x,y,∈N) is a perfect power based on Cullen’s conj...
Open Access Library J.   Vol.11, 2024
Doi:10.4236/oalib.1112171


Aug 28, 2024Open    Access

The Generalization of Combination Number

Zhongqi Zhou,Shijie Zhou
In this paper, the concepts of combination number, factorial and Euler function are generalized, and the concepts of generalized combination number, generalized Euler function and m factorial of n are proposed. Several typical Identities and congruence of generalized combination number are proved, and the calculation formulas of generalized Euler function are derived. Using the m factorial of n, the congruence formula of the modular prime of the original facto...
Open Access Library J.   Vol.11, 2024
Doi:10.4236/oalib.1112012


Aug 26, 2024Open    Access

The Solution of the Indefinite Equation by the Method of Euclidean Algorithm

Zhongqi Zhou
In this paper, a new mathematical method is used to study the indefinite equations of binary quadratic and binary arbitrary order, the problem of judging and solving these indefinite equations with or without solutions is solved.
Open Access Library J.   Vol.11, 2024
Doi:10.4236/oalib.1112011


Jul 12, 2022Open    Access

Heterogeneity in the Elastic Half-Space (Deformations at Preparation of the Tectonic Earthquake)

Igor P. Dobrovolsky
With the help of Mindlin’s tensor, the problem of heterogeneity in an elastic half-space comes down to the solution system of integrable equations. Different versions of the solution of such systems are considered. The main attention is paid to the solution of integrable equations with small parameters.
Open Access Library J.   Vol.9, 2022
Doi:10.4236/oalib.1108714


Feb 24, 2021Open    Access

Elastic Layer on the Elastic Half-Space: The Solution in Matrixes

Igor Petrovich Dobrovolsky
If to apply bidimensional Fourier’s transform to homogeneous system of equations of the theory of elasticity, then we will receive system of ordinary differential equations. The general solution of this system contains 6 arbitrary constants and allows to solve problems for the layer and the multilayer environment. It is shown that it is convenient to do statement and the solution of such tasks in the matrix form. The task for the layer on the elastic half-space is solved. Ways of inverse of Four...
Open Access Library J.   Vol.8, 2021
Doi:10.4236/oalib.1107191


May 07, 2020Open    Access

On the Stability of Duffing Type Fractional Differential Equation with Cubic Nonlinearity

Nnaji Daniel Ugochukwu, Makuochukwu Felix Oguagbaka, Ezenwobodo Somkene Samuel, Nnaemeka Stanley Aguegboh, Onyiaji Netochukwu Ebube
The purpose of this paper is to study the stability of nonlinear fractional Duffing equation where , by analysing the eigenvalues generated from the system of the given differential equation. Graphical results furthermore show the effect of the damping and nonlinear parameter on the system. Our contribution relies on its application to the choice of hard/soft spring in the mechanism of shock absorbers.
Open Access Library J.   Vol.7, 2020
Doi:10.4236/oalib.1106184


Mar 23, 2020Open    Access

On a Nonlinear Volterra-Fredholm Integrodifferential Equation on Time Scales

Mohammed I. Noori, Akram H. Mahmood
The main aim in this work is to obtain an integral inequality with a clear estimate on time scales. The obtained inequality is used as a tool to investigate some basic qualitative properties of solutions to certain nonlinear Volterra-Fredholm integrodifferential equations on time scales.
Open Access Library J.   Vol.7, 2020
Doi:10.4236/oalib.1106103


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