| mkDecimal(i / 10, abs(i0) - 1) = mkDecimal(mkDecimal(i / 10, abs(i0) - 1).int, mkDecimal(i / 10, abs(i0) - 1).scale), i % 10 = 0, ∀ i1, i0. i→n(i1) < i→n(i) → true → mkDecimal(i1, i0) = mkDecimal(mkDecimal(i1, i0).int, mkDecimal(i1, i0).scale) ⊦ i0 = 0, i = 0, mkDecimal(i, i0) = mkDecimal(mkDecimal(i / 10, abs(i0) - 1).int, mkDecimal(i / 10, abs(i0) - 1).scale) |
mkDecimal(i / 10, abs(i0) - 1) = mkDecimal(mkDecimal(i / 10, abs(i0) - 1).int, mkDecimal(i / 10, abs(i0) - 1).scale), i % 10 = 0, ∀ i1, i0. i→n(i1) < i→n(i) → true → mkDecimal(i1, i0) = mkDecimal(mkDecimal(i1, i0).int, mkDecimal(i1, i0).scale) ⊦ i0 = 0, i = 0, mkDecimal(i, i0) = mkDecimal(i / 10, abs(i0) - 1)