Definability in Infinitary Languages and Invariance by Automorphisms
Languages of publication
Given a LE-structure E, where LE is an infinitary language, we show that and can be chosen in such way that every orbit of the group G of automorphisms of E is LE -definable. It follows that two sequences of elements of the domain D of E satisfy the same set of L-formulas if and only if they are in the same orbit of G.
07 - 07 - 2015
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