| P(H2 ∪ H0), H1 ⊥ H0, H2 ⊥ H1, H2 ⊥ H0, ∀ r. ¬ r ∈ H1 ∧ ¬ r ∈ H0 ⊦ P(H2), (∀ r. (r ∈ H1 ↔ r ∈ ∅) ∧ (r ∈ H1 → H1[r] = (∅)[r])) ∧ H0 = ∅ |
P(H2 ∪ H0), H2 ⊥ H0, H2 ⊥ H1, H1 ⊥ H0, ∀ r. ¬ r ∈ H1 ∧ ¬ r ∈ H0 ⊦ P(H2), ¬ r ∈ H1 ∧ H0 = ∅
Used simplifier rules: ⊦ ¬ r ∈ ∅; (s)