#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 eviatarbach):
Hmm... But isn't that the case with anything in the Symbolic Ring? For
example,
{{{
sage: SR(4) == 3
4 == 3
sage: type(limit(1/x, x=1))
<type 'sage.symbolic.expression.Expression'>
}}}
Calling `bool` with the equality returns a boolean:
{{{
sage: bool(a == b)
True
}}}
Call `.pyobject()` on the result from `limit` would be sensible, I think.
We have the following discrepancy now:
{{{
sage: type(diff(1))
<type 'sage.symbolic.expression.Expression'>
sage: type(integrate(0, x))
<type 'sage.rings.integer.Integer'>
}}}
It's very troubling how broken arithmetic and comparisons with infinities
is at the moment, as shown in #11506.
--
Ticket URL: <http://trac.sagemath.org/ticket/14857#comment:2>
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