fact: Definition valid_theory (T:theory) phi := forall D (I : interp D) rho, (forall psi, T psi -> rho ⊨ psi) -> rho ⊨ phi.
imports: Undecidability.FOL.Syntax.Core Undecidability.FOL.Syntax.Theories Undecidability(Shared.ListAutomation) Vector