⊦ H0 = H1 ↔ (∀ r. (r ∈ H0 ↔ r ∈ H1) ∧ (r ∈ H0 → H0[r] = H1[r]))
∀ r0. ¬ r0 ∈ rs ⊦ r ∈ rs, ∀ r. (r ∈ mk(rs, f) ↔ r ∈ ∅) ∧ (r ∈ mk(rs, f) → mk(rs, f)[r] = (∅)[r])
Used terms: ∅, mk(rs, f)