Guv,

Some complex operations cannot easily be reversed but surely it is not unreasonable to expect a simple operation like subtraction to be reversable. If you subtract number x from number y to get a result z, you would reasonably expect to be able to work backwards to add y to z to get x.

Therefore, starting with x = 1, you cannot get 9 + x to equal 9.9999(rec) without the prior assumption that 1 = 0.9999(rec).

Simonm,

You cannot name the smallest real number below 1 for the same reasons you cannot name the largest number.