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Recursively inseparable sets : ウィキペディア英語版
Recursively inseparable sets
In computability theory, recursively inseparable sets are pairs of sets of natural numbers that cannot be "separated" with a recursive set (Monk 1976, p. 100). These sets arise in the study of computability theory itself, particularly in relation to . Recursively inseparable sets also arise in the study of Gödel's incompleteness theorem.
== Definition ==

The natural numbers are the set ω = . Given disjoint subsets ''A'' and ''B'' of ω, a separating set ''C'' is a subset of ω such that ''A'' ⊆ ''C'' and ''B'' ∩ ''C'' = ∅ (or equivalently, ''A'' ⊆ ''C'' and ''B'' ⊆ ). For example, ''A'' itself is a separating set for the pair, as is ''ω\B''.
If a pair of disjoint sets ''A'' and ''B'' has no recursive separating set, then the two sets are recursively inseparable.

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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