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math.CA2021
On persistence of a Nicholson-type system with multiple delays and nonlinear harvesting
Pablo Amster, Melanie Bondorevsky
An N-dimensional generalization of Nicholson's equation is analyzed. We consider a model including multiple delays, nonlinear coefficients and a nonlinear harvesting term. Inspired…
math.FA2021
On a theorem by Browder and its application to nonlinear boundary value problems
Pablo Amster
In a paper from 1960, Felix Browder established a theorem concerning the continuation of the fixed points of a family of continuous functions depending continuously on…
math.CA2021
On an affinity principle by Krasnoselskii
Pablo Amster, Julián Epstein
An abstract formulation of a duality principle established by Krasnoselskii is presented. Under appropriate conditions, it shall be shown that, if the solutions of a nonlinear func…