Abstract model theory is a branch of mathematical logic that studies the properties and structures of models in formal languages without being constrained to specific interpretations or applications. It focuses on the relationships between different models of a theory, the nature of definability, and the classifications of theories based on their model-theoretic properties. Key concepts in abstract model theory include: 1. **Model**: A model is an interpretation of a formal language that satisfies a particular set of axioms or a theory.

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