Abstract
We consider certain classes of relational structures which do not have the Amalgamation Property, and hence do not have a universal homogeneous structure, but which can be made to satisfy the Amalgamation Property by the imposition of some additional structure. We thus obtain a class which is the age of a homogeneous structure, and which has the original class as «underlying structures». We show that the underlying structure of the countable universal homogeneous structure has a model complete theory, so is a model comparison for its universal theory
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