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In section Model-theoretic conservative extension: I believe the definition is not the intended at the moment. It should read:
- if every model of T_1 can be expanded to a model of T_2 and every model of T_2 restricted to the language of T_1 is a model of T_1.
Otherwise the implication in the next sentence is wrong.
Mattias Ulbrich (talk) 14:29, 1 September 2011 (UTC)