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Theorem FOFollowsW-old-def

⊦ FOFollowsW(t, bel, p, l) ↔ (∀ n. n < # p(l) ∧ p(l)[n].W? ∧ p(l)[n].tid = t → (∃ n0. n < n0 ∧ n0 < # p(l) ∧ p(l)[n0] = FO(t) ∨ bel ≠ [] ∧ bel.head = FO(l))) ∧ (bel ≠ [] → bel = SF ' ∨ bel = FO(l) ' + SF ' ∨ bel.head.W? ∧ bel.head.l = l ∧ bel.tail = FO(l) ' + SF ')