In classical set theory, an ordinary set is a unified whole which is composed of some elements.

经典集合论中，一个普通集合就是指某些元素组成的整体。

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Based on the interpretation of possibility measure based on rough set, we give an conversion algorithm of fuzzy set and rough set, thus establish a connection between these two non-classical set.

在可能性测度的粗糙集解释基础上，给出了模糊集与粗糙集的一个转化算法，从而建立了两种非经典集合之间的关系。

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This paper introduces extension and extension decision, relations and differences among extension set, classical set and fuzzy set and study trait of extension set and applied extension decision.

讨论了可拓学与可拓决策产生的实际背景，可拓集合与经典集合、模糊集合之间的区别和联系。研究了可拓集合的特点及其可拓决策应用的前景。

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This paper introduces extension and extension decision, relations and differences among extension set, classical set and fuzzy set and study trait of extension set and applied extension decision.

讨论了可拓学与可拓决策产生的实际背景，可拓集合与经典集合、模糊集合之间的区别和联系。研究了可拓集合的特点及其可拓决策应用的前景。

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