粗糙集理论是继概率论、模糊集、证据理论之后的又一个处理不确定性问题的新型数学工具。

Rough set theory is a new mathematical tool to deal with vagueness and Uncertainty problem after probability theory, fuzzy sets, mathematical theory of evidence.

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粗集理论是继概率论、模糊集、证据理论之后的又一种处理模糊和不确定性知识的数学工具。

Rough Set Theory is another mathematical tool used for dealing with fuzzy and uncertain knowledge besides Probability Theory, fuzzy Set Theory and Evidence Theory.

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单纯李群的表示论已经成为研究现代物理学最有用的数学工具之一。

The representation theory of simple Lie groups has now been established as one of the most useful tools in modern physics.

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