运用矩阵理论的圆盘定理，讨论了区间矩阵特征值的包含区域，得出了拟圆盘定理并讨论了稳定性。

By using Gerschgorin Theorem, the inclusion regions of an interval matrix and their applications are discussed in this paper.

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运用格序决策理论对区间数的排序问题进行研究，提出了一种新方法。

This paper investigates the problem of interval ranking by lattice order decision making theory, a new method is proposed.

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