Categorical Linearly Ordered Structures
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8
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Oberwolfach Preprints (OWP)
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Oberwolfach : Mathematisches Forschungsinstitut Oberwolfach
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Abstract
We prove that for every computable limit ordinal α there exists a computable linear ordering A which is Δ^(0)_(α)-categorical and α is smallest such, but nonetheless for every isomorphic computable copy B of A there exists a β<α such that A≅Δ0βB. This answers a question left open in the earlier work of Downey, Igusa, and Melnikov. We also show that such examples can be found among ordered abelian groups and real-closed fields.
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Keywords GND
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This document may be downloaded, read, stored and printed for your own use within the limits of § 53 UrhG but it may not be distributed via the internet or passed on to external parties.