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Theorems · Theorem · logic and foundations

FirstOrder.Language.Theory.IsComplete.models_not_iff

∀ {L : FirstOrder.Language} {T : L.Theory},
  T.IsComplete → ∀ (φ : L.Sentence), T ⊨ᵇ FirstOrder.Language.Formula.not φ ↔ ¬T ⊨ᵇ φ
Defined in
Mathlib.ModelTheory.Satisfiability
Cited by
2 results in Mathlib
Foundations
Depth 25 from the axioms · uses propext, Classical.choice, Quot.sound

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