GAS versus Lyapunov stability and global attractivity for time-delay systems

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Let the autonomous time-delay system be given on the history space Xn\mathcal X^n, with solution x(t,x0)x(t,x_0) from initial history x0x_0. GAS conjecture. The system is GAS if and only if it is stable, meaning that for every ε>0\varepsilon>0 there exists δ>0\delta>0 such that x0δ\|x_0\|\leq\delta implies x(t,x0)ε|x(t,x_0)|\leq\varepsilon for all t0t\geq0, and globally attractive, meaning that x(t,x0)0x(t,x_0)\to0 as t+t\to+\infty for every x0Xnx_0\in\mathcal X^n. This asks whether the uniformity implicit in GAS follows for time-delay systems from stability and global attractivity without assuming RFC; the parser reports that the conjecture is disproved.

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Primary source

Antoine Chaillet, Iasson Karafyllis, Pierdomenico Pepe and Yuan Wang, “The ISS framework for time-delay systems: a survey”, arXiv:2206.06167 (2022).

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