Electron. J. Diff. Eqns., Vol. 2001(2001), No. 59, pp. 1-8.

Existence of positive periodic solutions for non-autonomous functional differential equations

Sui Sun Cheng & Guang Zhang

Abstract:
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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Sui Sun Cheng
Department of Mathematics, National Tsing Hua University
Hsinchu, Taiwan 30043
e-mail: sscheng@math2.math.nthu.edu.tw

Guang Zhang
Department of Mathematics, Yanbei Normal Institute
Datong, Shanxi 037000, P.R.China
e-mail: dtgzhang@yahoo.com.cn

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