The author applies a generalized Leggett-Williams fixed point theorem to the study of the nonlinear functional differential equation . Sufficient conditions are established for the existence of multiple positive periodic solutions.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap93-1-6,
author = {Changxiu Song},
title = {Positive periodic solutions of functional differential equations with infinite delay},
journal = {Annales Polonici Mathematici},
volume = {93},
year = {2008},
pages = {75-83},
zbl = {1142.34363},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap93-1-6}
}
Changxiu Song. Positive periodic solutions of functional differential equations with infinite delay. Annales Polonici Mathematici, Tome 93 (2008) pp. 75-83. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap93-1-6/