Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/553
DC FieldValueLanguage
dc.contributor.authorWinter, M-
dc.contributor.authorWei, J-
dc.coverage.spatial21en
dc.date.accessioned2007-01-22T12:16:52Z-
dc.date.available2007-01-22T12:16:52Z-
dc.date.issued2006-
dc.identifier.citationMath Z 254: 359-383, 2006en
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/553-
dc.description.abstractWe show that there is a close relation between standing-wave solutions for the FitzHugh-Nagumo system $\Delta u +u(u-a)(1-u) - \delta v=0, \ \ \Delta v-\delta \gamma v + u=0 \ \ \mbox{in} \ R^N,$ $u, v \to 0 \ \mbox{as} \ |x| \to +\infty$ where $0<a<1/2$ and $\delta \gamma=\beta^2 \in (0, a)$, and the following combinatorial problem: {\it $(*) \ \ \$ Given $K$ points $Q_1, ..., Q_K \in R^N$ with minimum distance $1$, find out the maximum number of times that the minimum distance $1$ can occur. } More precisely, we show that for any given positive integer $K$, there exists a $\delta_{K}>0$ such that for $0<\delta <\delta_K$, there exists a standing-wave solution $(u_{\delta},v_{\delta})$ to the FitzHugh-Nagumo system with the property that $u_{\delta}$ has $K$ spikes $Q_{1}^\delta, ..., Q_K^\delta$ and $(\frac{1}{l^\delta} Q_1^\delta, ..., \frac{1}{l^\delta} Q_K^\delta)$ approaches an optimal configuration in (*), where $l^\delta=\min_{i \not = j} |Q_i^\delta -Q_j^\delta| = \frac{1}{ \sqrt{a} -\beta} \log \frac{1}{\delta} ( 1+o(1))$.en
dc.format.extent257559 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoen-
dc.publisherSpringeren
dc.subjectFitzHugh-Nagumo systemen
dc.subjectLocalised energy methoden
dc.subjectStanding waves-
dc.subjectOptimal configuration-
dc.titleStanding Waves in the FitzHugh-Nagumo System and a Problem in Combinatorial Geometryen
dc.typeResearch Paperen
dc.identifier.doihttp://doi.dx.org/10.1007/s00209-006-0952-8-
Appears in Collections:Dept of Mathematics Research Papers
Mathematical Sciences

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