#12967: bugs in comparisons between constants, wrapped pyobjects, infinity
-------------------------------------+-------------------------------------
Reporter: dkrenn | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.6
Component: symbolics | Resolution:
Keywords: compare pi | Merged in:
infinity bool | Reviewers: Karl-Dieter Crisman
Authors: Travis Scrimshaw, | Work issues:
Ralf Stephan | Commit:
Report Upstream: N/A | c5845f6b18d582807dafaaf60ad6a5c8017173f3
Branch: u/rws/12967-2 | Stopgaps:
Dependencies: #17984 |
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Comment (by pbruin):
Replying to [comment:47 ppurka]:
> Replying to [comment:44 pbruin]:
> > Maybe we should discourage users from using `x in RR`. There is the
following alternative:
> > {{{
> > sage: pi.is_real()
> > True
> > }}}
>
> I don't think this is a good idea. This breaks consistency across the
different fields.
Only if you identify `RR` with the mathematical field '''R''' of real
numbers. If we are serious about presenting `RR` as a certain set of
numbers that is quite different from the mathematical field '''R''' (for
example, `Infinity in RR` already returns `True`), then we can just let
`pi in RR` return `False`, emphatically warn users about this, and say
that different methods are needed to decide if an expression represents a
mathematical real number.
--
Ticket URL: <http://trac.sagemath.org/ticket/12967#comment:49>
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