Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-04-29 20:31 812518d9

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feat(model_theory/semantics, satisfiability): Complete Theories (#13558) Defines first_order.language.Theory.is_complete, indicating that a theory is complete. Defines first_order.language.complete_theory, the complete theory of a structure. Shows that the complete theory of a structure is complete.

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