دورهاي حدي در دستگاه شكار- شكارچي گوس يا تابع پاسخ

In this paper we have considered limit cycle problem in a Cause predator-prey system with a functional response. The functional response is assumed convex and increasing, also a unique root for the third derivative is assumed. Under certain assumption we will admire necessary and sufficient condition for non-existence of limit cycle in the Cause system, this condition guarantee global stability of the positive equilibrium point in the x>0 and y>O region.