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Theorem topred-def

⊦ t =>top t' ↔ (∃ v1, v2. t = K _ v1 _ v2 ∧ t' = v1 ∧ value(v1) ∧ value(v2)) ∨ (∃ v1, v2, v3. t = S _ v1 _ v2 _ v3 ∧ t' = v1 _ v3 _ (v2 _ v3) ∧ value(v1) ∧ value(v2) ∧ value(v3))