#19918: substitute exp(-x) with x infinity fails
------------------------------+------------------------
Reporter: vdelecroix | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: symbolics | Resolution:
Keywords: bug | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by vdelecroix:
Old description:
> {{{
> sage: exp(-Infinity)
> 0
> }}}
> is fine, but
> {{{
> sage: exp(-x).subs(x=Infinity)
> Traceback (most recent call last):
> ...
> RuntimeError: exp_eval(): exp^(unsigned_infinity) encountered
> }}}
New description:
{{{
sage: exp(-Infinity)
0
}}}
is fine, but
{{{
sage: exp(-x).subs(x=Infinity)
Traceback (most recent call last):
...
RuntimeError: exp_eval(): exp^(unsigned_infinity) encountered
}}}
Original report thread:
https://groups.google.com/forum/#!topic/sage-devel/tqDSbZ499ME
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Ticket URL: <http://trac.sagemath.org/ticket/19918#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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