| rs1 ∩ rs0 = ∅, R[rs0, cf, af], ∀ r. r ∈ rs1 → af(r) = o, ∃ H0, H1. H0 ⊥ H1 ∧ mk(rs1, cf) = H0 ∪ H1 ∧ ((r => a × r0))(H0) ∧ ls(r0, x0)(H1) ⊦ r = null, r ∈ rs1, r ∈ rs0 |
mk(rs1, cf) = H0 ∪ H, rs1 ∩ rs0 = ∅, ((r => a × r0))(H0), R[rs0, cf, af], ls(r0, x0)(H), H0 ⊥ H, ∀ r. r ∈ rs1 → af(r) = o ⊦ r = null, r ∈ rs0, r ∈ rs1