⊦ H0 = H1 ↔ (∀ r. (r ∈ H0 ↔ r ∈ H1) ∧ (r ∈ H0 → H0[r] = H1[r]))
H ∪ H0 = H ∪ H1, H ⊥ H0, H ⊥ H1 ⊦ ∀ r. (r ∈ H0 ↔ r ∈ H1) ∧ (r ∈ H0 → H0[r] = H1[r])
Used terms: H1, H0