Comments on "Adaptive Neural Control for a Class of Nonlinearly Parametric Time-Delay Systems

In this comment, we point out an error in [1], which will show that the main result of the paper cannot be generalized for nonlinearly parametric time-delay systems considered in [1]. In [1], the authors considered the problem of the adaptive control for a class of nonlinearly parametric time-delay systems and applied successfully the proposed approach to second-order nonlinear time-delay systems with the term x
₁
(t - tau)x
₂
(t - tau) used as simulation examples in Section VI. However, we show in this comment that the control approach presented in [1] cannot be generalized although it is realizable for nonlinear second-order time-delay systems with the term x
₁
(t - tau ) x
₂
(t - tau). In addition, we illustrate this error by one detail example. For simplicity, all the symbols in this comment are the same as those in [1].