Electronic Journal of Differential Equations,
Vol. 2010(2010), No. 118, pp. 1-16.

Title: Existence of three positive periodic solutions for
       differential systems with feedback controls on time scales

Authors: Yongkun Li  (Yunnan Univ., Kunming, China)
         Tianwei Zhang (Yunnan Univ., Kunming, China)
	 Jianfeng Suo (Yunnan Univ., Kunming, China)

Abstract:
 Using the Leggett-Williams multiple fixed point theorem,
 we establish criteria for the existence of three positive
 periodic solutions of a class of differential systems with
 feedback controls on time scales.

Submitted March 25, 2010. Published August 20, 2010.
Math Subject Classifications: 34K13.
Key Words: Positive periodic solutions;  feedback controls; 
           time scales; Leggett-Williams multiple fixed point theorem.