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词汇 Recursive ordinal
分类 英语词汇 英语翻译词典
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Recursive ordinal

英语百科

Recursive ordinal

In mathematics, specifically set theory, an ordinal \alpha is said to be recursive if there is a recursive well-ordering of a subset of the natural numbers having the order type \alpha.

It is trivial to check that \omega is recursive, the successor of a recursive ordinal is recursive, and the set of all recursive ordinals is closed downwards. The supremum of all recursive ordinals is called the Church-Kleene ordinal and denoted by \omega^{CK}_1. Indeed, an ordinal is recursive if and only if it is smaller than \omega^{CK}_1. Since there are only countably many recursive relations, there are also only countably many recursive ordinals. Thus, \omega^{CK}_1 is countable.

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