Recently Pesin introduced a large class of hyperbolic attractors, and for those attractors he established the Smale spectral decomposition. In this paper our main results are a stretched exponential bound on the decay of correlations and the central limit theorem. Also we will obtain conditions under which two well known attractors-those of Belykh and Lozi-are subject to our main results. (c) 1995 American Institute of Physics.
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Cogn Neurodyn
October 2024
School of Electrical Information and Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002 China.
In this paper, a cosine hyperbolic memristor model is proposed with bistable asymmetric hysteresis loops. A neural network of coupled hyperbolic memristor is constructed by using the Fitzhugh-Nagumo model and the Hindmarsh-Rose model. The coupled neural network with a large number of equilibrium points is obtained by numerical analysis.
View Article and Find Full Text PDFNeural Netw
March 2025
Oak Ridge National Laboratory, Oak Ridge, TN, USA.
Recurrent neural networks (RNNs) are an important class of models for learning sequential behavior. However, training RNNs to learn long-term dependencies is a tremendously difficult task, and this difficulty is widely attributed to the vanishing and exploding gradient (VEG) problem. Since it was first characterized 30 years ago, the belief that if VEG occurs during optimization then RNNs learn long-term dependencies poorly has become a central tenet in the RNN literature and has been steadily cited as motivation for a wide variety of research advancements.
View Article and Find Full Text PDFSci Rep
October 2024
LAMA Laboratory, Department of Mathematics, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco.
Chaos
October 2024
TNO Sustainable Urban Mobility and Safety, P.O. Box 96800, 2509 JE The Hague, The Netherlands.
We will consider a thermostatic system, Sprott B, that is a generalization of the well-known one-parameter Sprott A system. Sprott B contains an explicit periodic solution for all positive values of the parameter a. As for Sprott A, we find dissipative KAM tori associated with time-reversal symmetry and canards in dissipative systems.
View Article and Find Full Text PDFChaos
September 2024
Departamento de Física, Universidade Federal do Paraná, 81531-990 Curitiba, Paraná, Brazil.
Unstable dimension variability is an extreme form of non-hyperbolic behavior that causes a severe shadowing breakdown of chaotic trajectories. This phenomenon can occur in coupled chaotic systems possessing symmetries, leading to an invariant attractor with riddled basins of attraction. We consider the coupling of two Lorenz-like systems, which exhibits chaotic synchronized and anti-synchronized states, with their respective basins of attraction.
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