对其中的六类问题，给出了范数型结构向后误差的表达式或较精确的上、下界估计。
We give expressions or upper and lower bounds of the normwise backward errors for six kinds of problems.
结果获得了两类混联系统可靠度上下界的表达式。
Results the upper and the lower bounds of compound systems are obtained.
结果获得了两类混联系统可靠度上下界的表达式。
Results the upper and the lower bounds of compound systems are obtained.
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