Sui Sun Cheng & Guang Zhang
We establish the existence of positive periodic solutions for a first-order differential equation with periodic delay. For this purpose, we use the fixed point theorem proved by Krasnoselskii.
Submitted May 16, 2001. Published September 4, 2001.
Math Subject Classifications: 34B15.
Key Words: positive periodic solutions, cone, delay.
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Department of Mathematics, Yanbei Normal Institute
Datong, Shanxi 037000, P.R.China