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It is shown that the Rayleigh's dissipation function can be successfully applied in the solution of mechanical problems involving friction non-linear in the velocities. Through the study of surfaces at contact we arrive at a simple integral…

Classical Physics · Physics 2015-04-10 E. Minguzzi

The derivative expansion approach to the calculation of the interaction between two surfaces, is a generalization of the proximity force approximation, a technique of widespread use in different areas of physics. The derivative expansion…

Quantum Physics · Physics 2015-06-19 C. D. Fosco , F. C. Lombardo , F. D. Mazzitelli

In this article we show that the fractional Laplacian in $R^{2}$ can be factored into a product of the divergence operator, a Riesz potential operator, and the gradient operator. Using this factored form we introduce a generalization of the…

Analysis of PDEs · Mathematics 2024-05-03 Xiangcheng Zheng , V. J. Ervin , Hong Wang

Generating functions and functional equations of Dickson polynomials of the first and second kind are derived and continued analytically. These formulae are expressed in terms of the incomplete gamma function over complex variables of the…

Combinatorics · Mathematics 2022-11-29 Robert Reynolds

We propose new linear combinations of compositions of a basic second-order scheme with appropriately chosen coefficients to construct higher order numerical integrators for differential equations. They can be considered as a generalization…

Numerical Analysis · Mathematics 2024-04-25 Sergio Blanes , Fernando Casas , Luke Shaw

General formula for causal Green's function of linear differential operator of given degree in one variable is given according to coefficient functions of differential operator as a series of integrals. The solution also provides analytic…

Classical Analysis and ODEs · Mathematics 2013-04-16 Adel Kassaian

We introduce more general concepts of Riemann-Liouville fractional integral and derivative on time scales, of a function with respect to another function. Sufficient conditions for existence and uniqueness of solution to an initial value…

Classical Analysis and ODEs · Mathematics 2018-07-24 Kheira Mekhalfi , Delfim F. M. Torres

We derive an extension of the Ryu-Takayanagi prescription for curvature squared theories of gravity in the bulk, and comment on a prescription for more general theories. This results in a new entangling functional, that contains a…

High Energy Physics - Theory · Physics 2015-06-17 Joan Camps

This paper proposes a reduction technique for the generalised Riccati difference equation arising in optimal control and optimal filtering. This technique relies on a study on the generalised discrete algebraic Riccati equation. In…

Dynamical Systems · Mathematics 2013-05-24 Augusto Ferrante , Lorenzo Ntogramatzidis

A superposition rule is a particular type of map that enables one to express the general solution of certain systems of first-order ordinary differential equations, the so-called Lie systems, out of generic families of particular solutions…

Mathematical Physics · Physics 2011-07-14 J. F. Cariñena , J. de Lucas

The Riccati differential equation is examined in light of its connection to second order linear time varying systems. In that light it becomes the clear generalization for the characteristic equation of linear time invariant systems, and is…

Dynamical Systems · Mathematics 2026-04-24 Douglas R. Frey

The basis of this work is a simple, extended corollary of Wilson's theorem. This corollary generates many more quotients than those already generated by Wilson's theorem, and it was of interest to derive how they relate to each other and…

Number Theory · Mathematics 2025-05-23 Ivan V. Morozov

A generalized definition of the determinant of matrices is given, which is compatible with the usual determinant for square matrices and keeps many important properties, such as being an alternating multilinear function, keeping…

Classical Analysis and ODEs · Mathematics 2021-12-01 Xuesong Lu , Songtao Mao , Zixing Wang , Yuehui Zhang

In the first part, we consider generalized quadratic Gauss sums as finite analogues of the Jacobi theta function, and the reciprocity law for Gauss sums as their transformation formula. We attach finite Dirichlet series to Gauss sums using…

Number Theory · Mathematics 2019-10-22 Zavosh Amir-Khosravi

In this paper, we introduce a family of generalized Donaldson's functional on holomorphic vector bundles, whose Euler-Lagrange equations are a vector bundle version of the complex $k$-Hessian equations. We also discuss the uniqueness of…

Differential Geometry · Mathematics 2020-12-02 Chuanjing Zhang , Xi Zhang

In this paper we show several connections between special functions arising from generalized COM-Poisson-type statistical distributions and integro-differential equations with varying coefficients involving Hadamard-type operators. New…

Probability · Mathematics 2021-01-12 Roberto Garra , Enzo Orsingher , Federico Polito

In this paper we utilize the covariance of Ricatti equation with respect to linear fractional transformations to define classes of conformally equivalent second order differential equations. This motivates then the introduction of…

Mathematical Physics · Physics 2007-05-23 Mayer Humi

The detailed construction of the general solution of a second order non-homogenous linear operatordifference equation is presented. The wide applicability of such an equation as well as the usefulness of its resolutive formula is shown by…

Mathematical Physics · Physics 2008-04-18 M. A. Jivulescu , A. Napoli , A. Messina

In this paper we find a Clifford algebra associated to generalized Fibonacci quaternions. In this way, we provide a nice algorithm to obtain a division quaternion algebra starting from a quaternion non-division algebra and vice-versa.

Rings and Algebras · Mathematics 2014-04-08 Cristina Flaut

An integral formula is developed which applies to an essentially arbitrary function. An application is made to the Riemann zeta function.

Classical Analysis and ODEs · Mathematics 2013-09-17 M. L. Glasser
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