#19568: arb balls should have the precision of the parent
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: interfaces | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/arb_balls_should_have_the_precision_of_the_parent|
638f7f581a72056c39d013e4b46cce500176a710
Dependencies: #19152 | Stopgaps:
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Old description:
> The fact that `arb` balls can have a precision different from their
> parent is really confusing. It's different from anything else in Sage and
> leads to strange things like
> {{{
> sage: a = RealBallField(20)(1.3)
> sage: b = RealBallField(53)(1.3)
> sage: a == b
> True
> sage: a+0 == b+0
> False
> }}}
New description:
The fact that `arb` balls can have a precision different from their parent
is really confusing. It's different from anything else in Sage and leads
to strange things like
{{{
sage: from sage.rings.real_arb import RealBallField
sage: sage: from sage.rings.real_arb import RealBallField
sage: sage: a = RealBallField(20)(1.3)
sage: sage: b = RealBallField(53)(1.3)
sage: a.identical(b)
True
sage: (a+0).identical(b+0)
False
}}}
--
Comment (by jdemeyer):
Replying to [comment:6 cheuberg]:
> Replying to [comment:4 jdemeyer]:
> > There is a good reason, read the ticket description.
>
> Equality of balls is rare, it only holds if either the objects are
identical (`is` is a subset of `==`) or if both balls are exact and equal.
OK, then it's just my example which is wrong.
--
Ticket URL: <http://trac.sagemath.org/ticket/19568#comment:7>
Sage <http://www.sagemath.org>
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