#16436: is_real method should exist for elements of AA, ZZ, QQ
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Reporter: slabbe | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by tmonteil):
Hi Sebastien. Note that you can also use coercion with the poorest real
representation:
{{{
sage: AA(3) in RealField(2)
True
sage: CC(3) in RealField(2)
True
sage: RR(3) in RealField(2)
True
sage: SR(3) in RealField(2)
True
sage: ZZ(3) in RealField(2)
True
sage: QQ(3) in RealField(2)
True
sage: AA(3) in RealField(2)
True
sage: QQbar(3) in RealField(2)
True
}}}
though you need to be careful with `NaN` and `+/-Infinity` that also
belong to `RealField(2)`. By the way:
{{{
sage: SR(Infinity).is_real()
True
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/16436#comment:1>
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