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deng jia guan xi yu shu xi de kuo chong
Author(s): 
Pages: 90-92
Year: Issue:  3
Journal: Journal of Taiyuan Normal University(Natural Science Edition)

Keyword:  等价关系等价类商集;
Abstract: 数集是数学研究的基础。从小学的自然数开始 ,数经过一次次的扩充 ,到高中的复数 ,每一次扩充实际上都是一次依据等价关系的集合的分类。本文从集合论的观点即集合的分类方法讨论了数系的扩充 ,对于更准确地理解数概念 ,是大有裨益的。
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