#9480: Sage mixes Infinity and +Infinity
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Reporter: zimmerma | Owner: robertwb
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: coercion | Resolution:
Keywords: infinity, equality | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by zimmerma):
* status: new => needs_review
Comment:
in Sage 5.11 we get:
{{{
sage: l1=limit(1/x, x=0, dir='right'); l1
+Infinity
sage: l2=limit(1/x, x=0, dir='left'); l2
-Infinity
sage: l3=limit(1/x, x=0); l3
Infinity
sage: bool(l1==l2), bool(l2==l3), bool(l3==l1)
(False, False, False)
}}}
however the objects returned are in SR and not in the {{{infinity}}}
class:
{{{
sage: type(l1), l1.parent()
(sage.symbolic.expression.Expression, Symbolic Ring)
sage: p1=+Infinity
sage: type(p1), p1.parent()
(sage.rings.infinity.PlusInfinity, The Infinity Ring)
}}}
I propose to close that ticket, and open a new one about the above issue
(or add it to an existing ticket).
Paul
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Ticket URL: <http://trac.sagemath.org/ticket/9480#comment:4>
Sage <http://www.sagemath.org>
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