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Theorem FOFollowsW-def

⊦ FOFollowsW(t, bel, fowl, l) ↔ (∀ fowl0, fowl1, v. fowl = fowl0 + W(v, t) ' + fowl1 → FO(t) ∈ fowl1 ∨ FO(l) ∈ bel) ∧ (∀ bel0, bel1, v. bel = bel0 + W(l, v) ' + bel1 → FO(l) ∈ bel1)