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Exponential Stability of Traveling Pulse Solutions of a Singularly Perturbed System of Integral Differential Equations Arising From Excitatory Neuronal Networks

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Acta Mathematicae Applicatae Sinica : Volume 20, Issue 1, March 2004

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Exponential Stability of Traveling Pulse Solutions of a Singularly Perturbed System of Integral Differential Equations Arising From Excitatory Neuronal Networks

Content Provider	Springer Nature Link
Author	Zhang, Linghai
Copyright Year	2004
Abstract	We establish the exponential stability of fast traveling pulse solutions to nonlinear singularly perturbed systems of integral di.erential equations arising from neuronal networks. It has been proved that exponential stability of these orbits is equivalent to linear stability. Let $$ {\mathcal{\mathcal{L}}} $$ be the linear differential operator obtained by linearizing the nonlinear system about its fast pulse, and let $$ \sigma {\left( {\mathcal{\mathcal{L}}} \right)} $$ be the spectrum of $$ {\mathcal{\mathcal{L}}} $$ . The linearized stability criterion says that if $$ \max {\left\{ {\operatorname{Re} \lambda :\lambda \in \sigma {\left( {\mathcal{\mathcal{L}}} \right)},\lambda \ne 0} \right\}} \leqslant - D $$ , for some positive constant D, and λ = 0 is a simple eigenvalue of $$ {\mathcal{\mathcal{L}}}{\left( \varepsilon \right)} $$ , then the stability follows immediately (see [13] and [37]). Therefore, to establish the exponential stability of the fast pulse, it suffices to investigate the spectrum of the operator $$ {\mathcal{\mathcal{L}}} $$ . It is relatively easy to find the continuous spectrum, but it is very difficult to find the isolated spectrum. The real part of the continuous spectrum has a uniformly negative upper bound, hence it causes no threat to the stability. It remains to see if the isolated spectrum is safe.Eigenvalue functions (see [14] and [35,36]) have been a powerful tool to study the isolated spectrum of the associated linear differential operators because the zeros of the eigenvalue functions coincide with the eigenvalues of the operators. There have been some known methods to define eigenvalue functions for nonlinear systems of reaction diffusion equations and for nonlinear dispersive wave equations. But for integral differential equations, we have to use different ideas to construct eigenvalue functions. We will use the method of variation of parameters to construct the eigenvalue functions in the complex plane ℂ. By analyzing the eigenvalue functions, we find that there are no nonzero eigenvalues of $$ {\mathcal{\mathcal{L}}}{ 1pt} {\text{in}}{\left\{ {\lambda \in \mathbb{C}:\operatorname{Re} \lambda \geqslant - D} \right\}} $$ for the fast traveling pulse. Moreover λ = 0 is simple. This implies that the exponential stability of the fast orbits is true.
Ending Page	308
Page Count	26
Starting Page	283
File Format	PDF
ISSN	01689673
e-ISSN	16183932
Journal	Acta Mathematicae Applicatae Sinica
Issue Number	2
Volume Number	20
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2004-06-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	linear differential operators Theoretical, Mathematical and Computational Physics traveling pulse solutions Singular perturbations eigenvalue problems eigenvalue functions Applications of Mathematics Math Applications in Computer Science Integral differential equations exponential stability Neural biology
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics

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