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Hyperarithmetical theory
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Hyperarithmetical theory : ウィキペディア英語版
Hyperarithmetical theory
In recursion theory, hyperarithmetic theory is a generalization of Turing computability. It has close connections with definability in second-order arithmetic and with weak systems of set theory such as Kripke–Platek set theory. It is an important tool in effective descriptive set theory.
== Hyperarithmetical sets ==

The central focus of hyperarithmetic theory is the sets of natural numbers known as hyperarithmetic sets. There are three equivalent ways of defining this class of sets; the study of the relationships between these different definitions is one motivation for the study of hyperarithmetical theory.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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