#17428: wrong limit in derivative
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Reporter: wonder | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: derivative limit | Merged in:
Authors: | Reviewers:
Report Upstream: Not yet reported upstream; | Work issues:
Will do shortly. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by pbruin):
A slightly simpler example:
{{{
(%i1) dg: diff(g(x), x);
d
(%o1) -- (g(x))
dx
(%i2) lim: limit(dg, x, 0);
d
(%o2) limit -- (g(x))
x -> 0 dx
(%i3) limit(lim, x, 0);
d
(%o3) limit (limit -- (g(x)))
x -> 0 x -> 0 dx
(%i4) limit(lim, a, 0);
d
(%o4) -- (g(x))
dx
}}}
In `%i3` the double limit over `x` is not simplified (this might be a
different problem); in `%i4` taking the limit over `a` (which does not
occur in the expression at all) removes the limit over `x`.
--
Ticket URL: <http://trac.sagemath.org/ticket/17428#comment:3>
Sage <http://www.sagemath.org>
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