#14857: SR(infinity) / unsigned_infinity returns 0
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Reporter: eviatarbach | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by zimmerma):
note also that {{{limit}}} returns "infinities" from the SymbolicRing and
not from the InfinityRing,
whereas it takes as input elements from the InfinityRing:
{{{
sage: a=+Infinity
sage: b=limit(x, x=a)
sage: type(a), a.parent()
(sage.rings.infinity.PlusInfinity, The Infinity Ring)
sage: type(b), b.parent()
(sage.symbolic.expression.Expression, Symbolic Ring)
}}}
As a consequence, the equality {{{a==b}}} does not return True:
{{{
sage: a==b
+Infinity == +Infinity
}}}
Paul
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Ticket URL: <http://trac.sagemath.org/ticket/14857#comment:1>
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