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《Journal of Hangzhou Teachers College》 1996-03
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Zhao Qingyu Wei Baorong Ding Changming(Department of Mathematics)  
In this Paper, at first we discuss the nonexistence of closed orbits for irreduciblecompetitive or cooperative system X = F(X) . X∈U, F∈C' (U) .where U is an open P -convex set in R3.secondly deal with the existence and stability of closed orbits for non-negative feedback system x1 = f (x3) -a1x1,x2 = x1 - a2x2,x3=x2-a3x3,where 0a1.for i - 1,2,3,f'(x3)≤0 for x3≥0.
【Fund】: 国家自然科学基金
【CateGory Index】: O171
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