Paper Info
Title
The Lojasiewicz Exponent At An Equilibrium Point Of A Standard Cnn Is 1/2
Abstract
In the sixties; Lojasiewicz proved a fundamental inequality for vector fields defined by the gradient of an analytic function, which gives a lower bound on the norm of the gradient in a neighborhood of a (possibly) non-isolated critical point. The inequality involves a number belonging to (0,1), which depends on the critical point, and is known as the Lojasiewicz exponent. In this paper, a class of vector fields which are defined on a hypercube of R-n. is considered. Each vector field is the gradient of a quadratic function in the interior of the hypercube, however it is discontinuous on the boundary of the hypercube. An extended Lojasiewicz inequality for this class of vector fields is proved, and it is also shown that the Lojasiewicz exponent at each point where a vector field vanishes is equal to 1/2. The considered fields include a class of vector fields which describe the dynamics of the output trajectories of a standard Cellular Neural Network (CNN) with a symmetric neuron interconnection matrix. By applying the extended Lojasiewicz inequality, it is shown that each output trajectory of a symmetric CNN has finite length, and as a consequence it converges to an equilibrium point. Furthermore, since the Lojasiewicz exponent at each equilibrium point of a symmetric CNN is equal to 1/2, it follows that each (state) trajectory, and each output trajectory, is exponentially convergent toward an equilibrium point, and this is true even in the most general case where the CNN possesses infinitely many nonisolated equilibrium points. In essence, the obtained results mean that standard symmetric CNNs enjoy the property of absolute stability of exponential convergence.
Year
DOI
Venue
2006
10.1142/S0218127406016008
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
Keywords
DocType
Volume
Cellular Neural Networks, complete stability, exponential convergence, finite trajectory length, Lojasiewicz inequality
Journal
16
Issue
ISSN
Citations 
8
0218-1274
5
PageRank 
References 
Authors
0.52
0
2
Name
Order
Citations
PageRank
Mauro Forti139836.80
Alberto Tesi229357.38