[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Arithmetic issues - feedback



Andre van Tonder <andre@xxxxxxxxxxxxxxxxxxx> writes:

>    I don't know, but a related question:  Does the spec in principle
>    disallow extensions for exact reals that are not exact rationals, 
>    in the sense of Edalat, Potts, etc.?  
>    (See e.g. http://www.doc.ic.ac.uk/~ae/exact-computation/ ).  

If you're asking whether the spec disallows this for the operations
specified in the section on exact arithmetic, then you're right---they
only work on exact rationals.  This is debatable, I guess, but one of
the purposes of that section is to have completely reproducible
arithmetic.  You lose that if you make these operations open-ended.

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla