In a recent paper (Xu and Liu, Control Theory & Applications, vol.15, no.4, pp. 501-506, 1998), a sufficient condition is reported for robust delay-dependence stability in terms of a bound on spectral radius of a prescribed nonnegative matrix. It seems to be fairly powerful, but we argue here that their result may be incorrect. A corrected result is presented in this paper also.%最近有一论文根据非负矩阵谱半径性质,给出了系统鲁棒稳定的一个充分条件,这一结果看起来十分有效,但事实上是不可靠的.本文指出了这一结果证明过程中的错误,并给出了修正后的结论.
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