⊦ P0 ⊆ P1 ↔ (∀ H. P0(H) → P1(H))
((Q0 * (P0 -* P1)))(H), Q0 ⊆ P0, ∀ H. P1(H) → Q1(H) ⊦ Q1(H)
Used terms: Q1, P1