| rs1 ∩ rs0 = ∅, R[rs0, f, g], a0[r => o][rs1, f, g] ⊦ (a1[r => o] * R)[rs1 ∪ rs0, f, g(r; a1)] ∧ g(r) = a0, a1[r => o][rs1, f, g(r; a1)] ∧ R[rs0, f, g(r; a1)] ∧ rs1 ∩ rs0 = ∅ |
rs1 ∩ rs0 = ∅, a0[r => o][rs1, f, g], R[rs0, f, g] ⊦ (a1[r => o] * R)[rs1 ∪ rs0, f, g(r; a1)] ∧ g(r) = a0, a1[r => o][rs1, f, g(r; a1)] ∧ R[rs0, f, g(r; a1)]