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Cardinal assignment

  • 基数指派(集合论中势的概念可通过函数的单射、双射、满射阐述,无需定义基数。单射可用于大小比较的预序关系)

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  基数指派

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Von Neumann cardinal assignment 冯·诺伊曼基数指派

Cardinal assignment

  • abstract: In set theory, the concept of cardinality is significantly developable without recourse to actually defining cardinal numbers as objects in theory itself (this is in fact a viewpoint taken by Frege; Frege cardinals are basically equivalence classes on the entire universe of sets which are equinumerous). The concepts are developed by defining equinumerosity in terms of functions and the concepts of one-to-one and onto (injectivity and surjectivity); this gives us a pseudo-ordering relation

以上来源于: WordNet

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