| dec = mkDecimal(i3, i4), mkDecimal(i, i0) * dec = mkDecimal(i1, i2) * dec ⊦ dec = mkDecimal(0, 0), mkDecimal(i, i0) = mkDecimal(i1, i2) |
mkDecimal(i, i0) * mkDecimal(i3, i4) = mkDecimal(i1, i2) * mkDecimal(i3, i4) ⊦ mkDecimal(i3, i4) = mkDecimal(0, 0), mkDecimal(i, i0) = mkDecimal(i1, i2)