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Computable choice functions for computable linear orderings

✍ Scribed by Manuel Lerman; Richard Watnick


Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
351 KB
Volume
49
Category
Article
ISSN
0044-3050

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✦ Synopsis


Abstract

A choice set for a computable linear ordering is a set which contains one element from each maximal block of the ordering. We obtain a partial characterization of the computable linear order‐types for which each computable model has a computable choice set, and a full characterization in the relativized case; Every model of the linear order‐type α of degree ≤ d has a choice set of degree ≤ d iff α can written as a finite sum of order‐types, each of which either has finitely many blocks, or has order‐type n · η for some integer n.


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