| r ∈ rs1 ↔ r = r, rs1 ∩ rs0 = ∅, ((r => o))((∅ ++ r)[r, o]), R[rs0, f, g], r0 ∈ rs1, r ∈ rs1 → f(r) = (r = r ⊃ o;(∅ ++ r)[r]), ∀ r1. (r1 ∈ rs1 ↔ r1 = r) ∧ (r1 ∈ rs1 → f(r1) = (r1 = r ⊃ o;(∅ ++ r)[r1])), ∀ r0. r0 ∈ rs1 → (r = r0 ⊃ a1;g(r0)) = a1 ⊦ # rs1 = 0, g(r0) = g(r), r = null, rs1 = ∅, (g(r)[r => o] * R)[rs1 ∪ rs0, f, g], r ∈ rs0 |
rs1 ∩ rs0 = ∅, ((r => f(r)))((∅ ++ r)[r, f(r)]), R[rs0, f, g], r ∈ rs1, r0 ∈ rs1, ∀ r0. r0 ∈ rs1 → (r = r0 ⊃ a1;g(r0)) = a1, ∀ r1. (r1 ∈ rs1 → r1 = r) ∧ (r1 ∈ rs1 → f(r1) = (r1 = r ⊃ f(r);(∅ ++ r)[r1])) ⊦ # rs1 = 0, g(r0) = g(r), r = null, rs1 = ∅, (g(r)[r => f(r)] * R)[rs1 ∪ rs0, f, g], r ∈ rs0