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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