Firstly, based on linear matrix inequalities (LMIs), a sufficient and necessary condition of circular regional controller possessing integrity for descriptor linear systems is given.

首先，用线性矩阵不等式(LMI)给出了线性广义系统圆盘区域的控制器存在的充分条件。

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Mr Edwards acknowledges that both individual and "regional inequalities" need to be tackled.

BBC: Would a new law narrow the gap between rich and poor?

Looking at the comparison of regional inequalities shown in figure 1, we are led to believe that Britain has the most unequal regional distribution, while Italy has the most equal.

ECONOMIST: Letters

Regional policy supposedly aims to lessen inequalities.

ECONOMIST: Brazil