Positive Periodic Solutions of Systems of First Order Ordinary Differential Equations

Consider the n-dimensional nonautonomous system ẋ(t) = A(t)G(x(t)) − B(t)F(x(t − τ(t))) Let u = (u 1,…,u n ), \(f^{i}_{0}={\rm lim}_{\|{\rm u}\|\righ...
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