Yong Wang

In Press, Corrected Proof, Available Online: 15 February 2021

In this paper, we classify affine Ricci solitons associated to canonical connections and Kobayashi-Nomizu connections and perturbed canonical connections and perturbed Kobayashi-Nomizu connections on three-dimensional Lorentzian Lie groups with some product structure.

Gülden Gün Polat, Teoman Özer

In Press, Corrected Proof, Available Online: 21 January 2021

This study focuses on the analysis of Ramsey dynamical model with current Hamiltonian defining an optimal control problem in a neoclassical growth model by utilizing Lie group theory. Lie point symmetries of coupled nonlinear first-order ordinary differential equations corresponding to first-order conditions...

Norbert Euler, Marianna Euler

Volume 16, Issue Supplement 1, March 2013, Pages 93-106

We derive solution-formulae for the Krichever–Novikov equation by a systematic multipotentialisation of the equation. The formulae are achieved due to the connections of the Krichever–Novikov equations to certain symmetry-integrable 3rd-order evolution equations which admit autopotentialisations.

S. Dimas, K. Andriopoulos, D. Tsoubelis, P. G. L. Leach

Volume 16, Issue Supplement 1, March 2013, Pages 73-92

We consider some well-known partial differential equations that arise in Financial Mathematics, namely the Black–Scholes–Merton, Longstaff, Vasicek, Cox–Ingersoll–Ross and Heath equations. Our central aim is to discover any underlying connections taking into account the Lie remarkability property of...

N. H. Ibragimov

Volume 16, Issue Supplement 1, March 2013, Pages 137-147

Systems of two nonlinear ordinary differential equations of the first order admitting nonlinear superpositions are investigated using Lie’s enumeration of groups on the plane. It is shown that the systems associated with two-dimensional Vessiot–Guldberg–Lie algebras can be integrated by quadrature upon...

Giuseppe Gaeta

Volume 16, Issue Supplement 1, March 2013, Pages 107-136

We review the basic ideas lying at the foundation of the recently developed theory of twisted symmetries of differential equations, and some of its developments.

P. G. L. Leach, N. Euler

Volume 16, Issue Supplement 1, March 2013, Pages 157-164

Hierarchies of evolution partial differential equations have become well-established in the literature over the last thirty years. More recently sequences of ordinary differential equations have been introduced. Of these perhaps the most notable is the Riccati Sequence which has beautiful singularity,...

A. H. Kara

Volume 16, Issue Supplement 1, March 2013, Pages 149-156

In this paper, we study and classify the conservation laws of the Jaulent–Miodek equations and other systems of KdV type equations which arises in, inter alia, shallow water equations. The main focus of the paper is the construction of the conservation laws as a consequence of the interplay between symmetry...

F. M. Mahomed, Asghar Qadir

Volume 16, Issue Supplement 1, March 2013, Pages 165-178

By the use of geometric methods for linearizing systems of second-order cubically semi-linear ordinary differential equations and the conditional linearizability of third-order quintically semi-linear ordinary differential equations, we extend to the fourth-order by differentiating the third-order conditionally...

M. Molati, F. M. Mahomed, C. Wafo Soh

Volume 16, Issue Supplement 1, March 2013, Pages 179-208

The purpose of this work is to perform group classification of a coupled system of partial differential equations (PDEs) modeling a flow in collapsible tubes. This system of PDEs contains unknown functions of the dependent variables whose forms are specified via the classification with respect to subalgebras...

Kostis Andriopoulos, Tassos Bountis, K. Van Der Weele, Liana Tsigaridi

Volume 16, Issue Supplement 1, March 2013, Pages 1-12

We study the solitary wave solutions of a non-integrable generalized KdV equation proposed by Fokas [A. S. Fokas, Physica D87, 145 (1995)], aiming to describe unidirectional waves in shallow water with greater accuracy than the standard KdV equation. This generalized equation includes higher-order terms...

Jacek Banasiak, Suares Clovis Oukouomi Noutchie, Ryszard Rudnicki

Volume 16, Issue Supplement 1, March 2013, Pages 13-26

We consider a fragmentation-coagulation equation with growth, where the nonlinear coagulation term, introduced in O. Arino and R. Rudnicki [2], is designed to model processes in which only a part of particles in the aggregates is capable of coalescence. We introduce various growth models, describing...

C. Muriel, J. L. Romero

Volume 16, Issue Supplement 1, March 2013, Pages 209-222

We characterize the equations in the class ������ of the second-order ordinary differential equations ẍ = M(t, x, ẋ) which have first integrals of the form A(t, x)ẋ + B(t, x). We give an intrinsic characterization of the equations in ������ and an algorithm to calculate explicitly such first integrals....

P. Basarab-Horwath, M. Euler, N. Euler, P. G. L. Leach

Volume 16, Issue Supplement 1, March 2013, Pages v-v

Diego Catalano Ferraioli, Paola Morando

Volume 16, Issue Supplement 1, March 2013, Pages 27-42

An application of solvable structures to the reduction of ODEs with a lack of local symmetries is given. Solvable structures considered here are all defined in a nonlocal extension, or covering space, of a given ODE. Examples of the reduction procedure are provided.

Giampaolo Cicogna

Volume 16, Issue Supplement 1, March 2013, Pages 43-60

We consider symmetries and perturbed symmetries of canonical Hamiltonian equations of motion. Specifically we consider the case in which the Hamiltonian equations exhibit a Λ-symmetry under some Lie point vector field. After a brief survey of the relationships between standard symmetries and the existence...

G. D’ambrosi, M. C. Nucci

Volume 16, Issue Supplement 1, March 2013, Pages 61-71

We apply the method of Jacobi Last Multiplier to the fifty second-order ordinary differential equations of Painlevé type as given in Ince in order to obtain a Lagrangian and consequently solve the inverse problem of Calculus of Variations for those equations. The easiness and straightforwardness of Jacobi’s...

Giuseppe Pucacco, Kjell Rosquist

Volume 16, Issue 4, March 2013, Pages 421-430

We present examples of nonstandard separation of the natural Hamilton–Jacobi equation on the Minkowski plane ������2. By “nonstandard” we refer to the cases in which the form of the metric, when expressed in separating coordinates, does not have the usual Liouville structure. There are two possibilities:...

José Antonio Vallejo

Volume 16, Issue 4, March 2013, Pages 443-454

We prove a version of the variational Euler–Lagrange equations valid for functionals defined on Fréchet manifolds, such as the spaces of sections of differentiable vector bundles appearing in various physical theories.

M. C. Nucci, P. G. L. Leach

Volume 16, Issue 4, March 2013, Pages 431-441

In a recent paper by Ibragimov a method was presented in order to find Lagrangians of certain second-order ordinary differential equations admitting a two-dimensional Lie symmetry algebra. We present a method devised by Jacobi which enables one to derive (many) Lagrangians of any second-order differential...

Niklas Brännström

Volume 16, Issue 4, March 2013, Pages 465-487

In [Y. Kifer, Averaging in difference equations driven by dynamical systems, Asterisque287 (2003) 103–123] a general averaging principle for slow-fast discrete dynamical systems was presented. In this paper we extend this method to weakly coupled slow-fast systems. For this setting we obtain sharper...

Norbert Euler, Marianna Euler

Volume 16, Issue 4, March 2013, Pages 489-504

We discuss nonlocal symmetries and nonlocal conservation laws that follow from the systematic potentialisation of evolution equations. Those are the Lie point symmetries of the auxiliary systems, also known as potential symmetries. We define higher-degree potential symmetries which then lead to nonlocal...

Jaume Llibre, Clàudia Valls

Volume 16, Issue 4, March 2013, Pages 505-516

We provide the complete classification of all global analytic first integrals of the simplified multistrain/two-stream model for tuberculosis and dengue fever that can be written as
x˙=x(β1−b−γ1−β1x−(β1−ν)y), y˙=y(β2−b−γ2−(β2−ν)x−β2y),
with β1, β2, b, γ1, γ2, ν ∈ ℝ.

Jaume Giné, Susanna Maza

Volume 16, Issue 4, March 2013, Pages 455-464

In this paper, we consider linearizability and orbital linearizability properties of the Lotka–Volterra system in the neighborhood of a singular point with eigenvalues 1 and -q. In this paper we give the explicit smooth near-identity change of variables that linearizes or orbital linearizes such Lotka–Volterra...