By constructing Liapunov functions and building a new inequality, we obtain two kinds of sufficient conditions for the existence and global exponential stabilit
Let P be an inner point of a convex N-gon ΓN: A1A2 …ANA1(N≥3), and let di,k denote the distance from the point Ai+k to the line PAi(i=1,2,… ,N, Ai=Aj(→)i≡