[socmag]

All numbers are ultimately "probabilistic" in calculations.

Sure you can state them as a "fact", but that undermines quantum theory itself and the Universe.

If you want to do the math right you really need to consider terms as peak probabilities and work from there. (See Chaos theory)

IMHO

Of course doing math with hard constraints is perfectly adequate for most macroscopic calculations.

That said, errors do add up given sufficient entropy and time.

It's quite simple to add fuzziness into the equations but quite a pain in the ass to compute with, plus you will in most cases get the same answer anyway.

As far as real numbers, they are no different from integers, just shift the decimal.