#13271: wrong sign with function Ei and limit
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Reporter: dkrenn | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.3
Component: symbolics | Resolution:
Keywords: Ei limit sign | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by kcrisman):
Or maybe I'm not.
{{{
sage.functions.other.Ei : lambda X : [[max_gamma_incomplete], 0, X]
}}}
which is [http://hg.sagemath.org/sage-
main/file/9ab4ab6e12d0/sage/interfaces/maxima_lib.py#l1358 here]. I was
kind of wondering about this in #11143, but since that didn't touch that I
figured it was okay.
[http://mathworld.wolfram.com/ExponentialIntegral.html Mathworld] seems to
indicate that this conversion isn't quite right, and who knows what this
would imply for complex `Z`. Yikes.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13271#comment:2>
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