scholarly journals Convergence and stability of generalized gradient systems by Łojasiewicz inequality with application in continuum Kuramoto model

2019 ◽  
Vol 39 (1) ◽  
pp. 345-367
Author(s):  
Zhuchun Li ◽  
◽  
Yi Liu ◽  
Xiaoping Xue ◽  
◽  
...  
Keyword(s):  
Kuramoto Model ◽  
Generalized Gradient ◽  
Gradient Systems ◽  
Convergence And Stability ◽  
Łojasiewicz Inequality ◽  
Lojasiewicz Inequality

Łojasiewicz inequality for a pair of semialgebraic functions

2021 ◽  
Vol 166 ◽  
pp. 102927
Author(s):  
Beata Osińska-Ulrych ◽  
Grzegorz Skalski ◽  
Anna Szlachcińska
Keyword(s):  
Łojasiewicz Inequality ◽  
Lojasiewicz Inequality

ŁOJASIEWICZ INEQUALITY FOR POLYNOMIAL FUNCTIONS ON NON-COMPACT DOMAINS

2012 ◽  
Vol 23 (04) ◽  
pp. 1250033 ◽  
Author(s):  
DINH SI TIEP ◽  
HA HUY VUI ◽  
NGUYEN THI THAO
Keyword(s):  
Polynomial Functions ◽  
Łojasiewicz Inequality ◽  
Lojasiewicz Inequality

In this paper we give some versions of the Łojasiewicz inequality on non-compact domains for polynomial functions. We also point out some relations between the existence Łojasiewicz inequality and the phenomenon of singularities at infinity.

THE ŁOJASIEWICZ EXPONENT AT AN EQUILIBRIUM POINT OF A STANDARD CNN IS 1/2

2006 ◽  
Vol 16 (08) ◽  
pp. 2191-2205 ◽  
Author(s):  
MAURO FORTI ◽  
ALBERTO TESI
Keyword(s):  
Vector Field ◽  
Equilibrium Point ◽  
Critical Point ◽  
Vector Fields ◽  
Equilibrium Points ◽  
Łojasiewicz Inequality ◽  
Łojasiewicz Exponent ◽  
Lojasiewicz Inequality ◽  
Output Trajectory ◽  
Lojasiewicz Exponent

In the sixties, Łojasiewicz 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 Łojasiewicz exponent. In this paper, a class of vector fields which are defined on a hypercube of ℝn, 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 Łojasiewicz inequality for this class of vector fields is proved, and it is also shown that the Łojasiewicz 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 Łojasiewicz 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 Łojasiewicz 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.

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