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Theorem isPropFO-def

⊦ isPropFO(n, l, bel) ↔ n < # bel ∧ bel[n] = FO(l) ∧ (∀ m. m < n → bel[m] ≠ SF ∧ (bel[m].W? ∨ bel[m].FO? → bel[m].l ≠ l))