On Thu, Mar 13, 2014 at 10:07:23AM +0100, Vincent Delecroix wrote:
> 2014-03-13 9:28 UTC+01:00, Marc Mezzarobba <m...@mezzarobba.net>:
> > Thierry wrote:
> >> - rename RR as RFF (for "real floating field"), so that this
> >> representation is not preferred than the others (especially RDF which
> >> is faster and allows using more libraries, with the same 53 bits of
> >> precision). The current name RR suggests it is the right default
> >> choice.
> >
> > Yes, there seems to be a lot of confusion due to the set of 53-bit
> > floating-point numbers being called "real field". See #11506 for a few
> > examples.
> >
> 
> These examples are great ! It would be more natural to have
> sage: Infinity in RFF and NaN in RFF     # real floating field
> True
> sage: Infinity in RR and NaN in RR         # real numbers
> False


Wile we are at it, create RRbar (in the sense of the natural
two-ends compactification):

sage: Infinity in RRbar
True
sage: NaN in RRbar
False

Ciao,
Thierry


> But the answer to "x in P" when x is an element and P a Parent is not
> quite clear to me.
> 
> Vincent
> 
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