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Preprint Number 769
769. Peter Sinclair
Computable Axiomatizability of Elementary Classes
Submission date: 4 September 2014.
The goal of this paper is to generalise Alex Rennet's proof of the non-axiomatizability of the class of pseudo-o-minimal structures. Rennet showed that if L is an expansion of the language of ordered fields and K is the class of pseudo-o-minimal L-structures (L-structures elementarily equivalent to an ultraproduct of o-minimal structures) then K is not axiomatizable.
Mathematics Subject Classification: 03C20
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