On Wed, Oct 29, 2008 at 9:05 AM, Georg <[EMAIL PROTECTED]> wrote: > > Hi Robert, > thanks again, > and sorry, my question was not well posed, fortunately (as a > mathematician) I know what an isomorphism is :-), > when I asked what does this exactly mean I actually wanted to know if > in the cases > 'sqrt(5. + RDF(5))' and 'sqrt(RDF(5) + 5.)' > computation is performed by two different implementations of sqrt (gsl > and mpfr) ?
Yes, there are two different implementations of sqrt. > which would mean that sage could be non-commutative in some > pathological cases (or simply if one of the implementations is buggy), > this would be an inconsistency which is not comparable with non- > associativity etc., because the latter obviously can't be avoided > since fixed precision reals do not form a field ... True. William > > thanks, Georg > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
