Address.
Guangdong Technical College of Water Conservancy and Electric Engineering,
Guangzhou, Guangdong 510610 P. R. China
Department of Computer Science, Guangdong Polytechnic Normal University, Guangzhou, Guangdong 510665, P. R. China
Department of Mathematics, Tsing Hua University, Hsinchu, Taiwan 30043, R. O. China
E-mail. sscheng@math.nthu.edu.tw
Abstract.
By means of the Krasnoselskii fixed piont theorem, periodic solutions are
found for a neutral type delay differential system of the form
\[
x^{\prime }\left( t\right) +cx^{\prime }\left( t-\tau \right) =A\left(
t,x(t)\right) x\left( t\right) +f\left( t,x\left( t-r_{1}\left( t\right)
\right) ,\dots,x\left( t-r_{k}\left( t\right) \right) \right) .
\]
AMSclassification. 39A11.
Keywords. Neutral differential system, periodic solutions, fixed point theorem.