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Positive periodic solutions of functional differential equations and population models. (English) Zbl 1010.34065
Authors’ summary: Here, Krasnosel’skii’s fixed-point theorem for cones is used to study the existence of positive periodic solutions to the system of infinite delay equations $x'(t)=A(t)x(t)+f(t,x_t).$ The authors prove two general theorems and establish new periodicity conditions for several population growth models.

##### MSC:
 34K13 Periodic solutions to functional-differential equations 92B05 General biology and biomathematics 92D25 Population dynamics (general)
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