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