美国的“泛灰”主要是由于生活在美国的人寿命更长。
The "graying" of the United States is mainly due to the fact that people in the u.
本文从灰色信息的内涵出发，给出了泛灰集与泛灰数概念。
The concepts of the hyper real set, universal grey set and universal grey number as derived from the connotation of grey information are proposed.
根据泛灰数的性质，定义了泛灰矩阵，提出了泛灰线性方程组的泛灰矩阵解法，并给出了算例。
Based universal Grey number's characteristic, universal Grey matrix is defined and universal Grey matrix Solution Method to universal Grey Linear Equations is introduced.
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