A new model of variable-length coupled pendulums: from hyperchaos to superintegrability

W Szumiński - Nonlinear Dynamics, 2024 - Springer
This paper studies the dynamics and integrability of a variable-length coupled pendulum
system. The complexity of the model is presented by joining various numerical methods …

Dynamics and non-integrability of the double spring pendulum

W Szumiński, AJ Maciejewski - Journal of Sound and Vibration, 2024 - Elsevier
This paper investigates the dynamics and integrability of the double spring pendulum, which
has great importance in studying nonlinear dynamics, chaos, and bifurcations. Being a …

Chaos and integrability of relativistic homogeneous potentials in curved space

W Szumiński, M Przybylska, AJ Maciejewski - Nonlinear Dynamics, 2024 - Springer
Relativistic Hamiltonian systems of n degrees of freedom in static curved spaces are
considered. The source of space-time curvature is a scalar potential V (q). In the limit of …

Integrable deformations, bi-Hamiltonian structures and nonintegrability of a generalized Rikitake system

K Huang, S Shi, Z Xu - … Journal of Geometric Methods in Modern …, 2019 - World Scientific
The aim of this paper is to investigate a generalized Rikitake system from the integrability
point of view. For the integrable case, we derive a family of integrable deformations of the …

Differential Galois integrability obstructions for nonlinear three-dimensional differential systems

W Szumiński, M Przybylska - Chaos: An Interdisciplinary Journal of …, 2020 - pubs.aip.org
In this short communication, we deal with an integrability analysis of nonlinear three-
dimensional differential systems. Right-hand sides of these systems are linear in one …

Absence of Closed-Form Descriptions for Gradient Flow in Two-Layer Narrow Networks

Y Park - arXiv preprint arXiv:2408.08286, 2024 - arxiv.org
In the field of machine learning, comprehending the intricate training dynamics of neural
networks poses a significant challenge. This paper explores the training dynamics of neural …

On the integrability of the SIR epidemic model with vital dynamics

D Chen - Advances in Mathematical Physics, 2020 - Wiley Online Library
In this paper, we study the SIR epidemic model with vital dynamics S.=− β SI+ μ N− S, I.= β
SI− γ+ μ I, R.= γ I− μ R, from the point of view of integrability. In the case of the death/birth …

On first integrals of a family of generalized Lorenz-like systems

S Yang, J Qu - Chaos, Solitons & Fractals, 2021 - Elsevier
In this paper, we study a seven-parameter family of generalized Lorenz-like systems x˙= a
(y− x), y˙= b x+ cy− dxz, z˙= e z+ fx y+ gx 2, from the view of integrability, which includes …

On integrability of the Nosé–Hoover oscillator and generalized Nosé–Hoover oscillator

W Li, S Shi, S Yang - International Journal of Geometric Methods in …, 2022 - World Scientific
The Nosé–Hoover system is a basic primitive model for the molecular dynamics simulations,
which describes the equilibrium characterized by canonical distributions at a constant …

三维微分系统的极限环与等时中心

黄文韬, 古结平, 王勤龙 - 《 广西师范大学学报》(自然科学版), 2022 - gxsf.magtech.com.cn
微分动力系统的极限环与等时中心是微分方程定性理论中2 个经典问题, 也是微分方程定性理论
领域的研究热点, 其研究有重要理论意义和应用价值. 相较于平面系统, 三维微分系统的极限环与 …