Author:
Ganchev Hristo,Soskova Mariya I.
Abstract
AbstractWe show that every splitting of in the local structure of the enumeration degrees, , contains at least one low-cuppable member. We apply this new structural property to show that the classes of all -pairs in , all downwards properly enumeration degrees and all upwards properly enumeration degrees are first order definable in .
Publisher
Cambridge University Press (CUP)
Cited by
12 articles.
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