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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