⊦ ((P0 -* P1))(H) ↔ (∀ H1. H1 ⊥ H ∧ P0(H1) → P1(H1 ∪ H))
P0(H1), P1(H0), H1 ⊥ H0, ∀ H0. H0 ⊥ H1 ∧ P1(H0) → P2(H0 ∪ H1) ⊦ P2(H1 ∪ H0)
Used terms: H1, P2, P1