借助矩阵的范数概念，对采样控制系统鲁棒稳定性进行了分析。
The Robust stability of sampled data control systems is analysed based on some properties of matrix norms.
本文获得了四元数矩阵的范数和迹的一些不等式，改进了近期的某些结果。
In this paper, we obtain some inequalities for norm and traces of quaternion matrices.
定义了四元数矩阵的范数，并利用范数的性质，建立了几个四元数矩阵之迹的不等式。
The definition of norm of quaternion matrices is given, and several inequalities on the traces of quaternion matrices are proved by using properties on the norm of quaternion matrices.
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