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Abstract and Applied Analysis - Volume 2014 2014, Article ID 920348, 5 pages -

Research ArticleDepartment of Mathematics, Northwest Normal University, Lanzhou 730070, China

Received 4 December 2013; Accepted 11 June 2014; Published 23 June 2014

Academic Editor: Youyu Wang

Copyright © 2014 Hongliang Gao and Ruyun Ma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A system of first order ordinary differential equations describing a population divided into juvenile and adult age groups is studied. The system is not cooperative but its linear part is, and this makes it possible to establish the existence and nonexistence results of positive solutions for the system in terms of the principal eigenvalue of the corresponding linearized system.

Autor: Hongliang Gao and Ruyun Ma

Fuente: https://www.hindawi.com/


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