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Nehari's problem and competing species systems

✍ Scribed by M. Conti; S. Terracini; G. Verzini


Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
141 KB
Volume
19
Category
Article
ISSN
0294-1449

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✦ Synopsis


We consider an optimal partition problem in N-dimensional domains related to a method introduced by Nehari [22]. We prove existence of the minimal partition and some extremality conditions. Moreover we show some connections between the variational problem, the behaviour of competing species systems with large interaction and changing sign solutions to elliptic superlinear equations.  2002 Éditions scientifiques et médicales Elsevier SAS RÉSUMÉ. -Nous étudions un problème de partition optimale dans R N qui se relie à une métode introduite par Nehari . Nous établissons l'existence de la partition optimale et quelques conditions d'extremalité. En plus nous démontrons un lien entre le problème variationel, le comportement asymptotique de certains systèmes quand l'interaction tends à l'infini et les solutions qui changent de signe pour les equations elliptiques surlinéaires.  2002 Éditions scientifiques et médicales Elsevier SAS


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Nehari problems and equalizing vectors f
✍ Orest Iftime; Hans Zwart 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 129 KB

For a class of inÿnite-dimensional systems we obtain a simple frequency domain solution for the suboptimal Nehari extension problem. The approach is via J -spectral factorization, and it uses the concept of an equalizing vector. Moreover, the connection between the equalizing vectors and the Nehari