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Boundedness and asymptotic stability for delayed equations of logistic type

Published online by Cambridge University Press:  12 July 2007

Teresa Faria
Affiliation:
Departamento de Matemática, Faculdade de Ciências/CMAF, Universidade de Lisboa, R. Ernesto Vasconcelos, 1749-016 Lisboa, Portugal (tfaria@lmc.fc.ul.pt)
Eduardo Liz
Affiliation:
Departamento de Matemática Aplicada II, ETSI Telecomunicación Universidad de Vigo, Campus Marcosende, 36280 Vigo, Spain (eliz@dma.uvigo.es)

Abstract

For a scalar Lotka–Volterra-type delay equation ẋ(t) = b(t)x(t)[1 − L(xt)], where L: C([−r, 0];R) → R is a bounded linear operator and b a positive continuous function, sufficient conditions are established for the boundedness of positive solutions and for the global stability of the positive equilibrium, when it exists. Special attention is given to the global behaviour of solutions for the case of L a positive linear operator. The approach used for this situation is applied to address the global asymptotic stability of delayed logistic models in the more general form ẋ(t) = b(t)x(t)[a(t) − L(t, xt)], with L(t, ·) being linear and positive.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2003

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