Nonexistence of radial positive solutions for a nonpositone problem.
Existence of non-negative solutions for nonlinear equations in the semi-positone case.
Radial positive solutions for a nonpositone problem in a ball.
Systems of nonlinear delay integral equations modelling population growth in a periodic environment
In this paper we study the existence and uniqueness of positive and periodic solutions of nonlinear delay integral systems of the type which model population growth in a periodic environment when there is an interaction between two species. For the proofs, we develop an adequate method of sub-supersolutions which provides, in some cases, an iterative scheme converging to the solution.
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