#12589: series yields wrong result
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Reporter: dkrenn | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: series, order, symbolics | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps: todo
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Comment (by rws):
I wrote earlier:
> Note that in Pynac/GiNaC the `degree`/`ldegree` member functions of
`basic` returns an `int` and since that is `virtual =0`, all other objects
do as well. So changing this would be major enhancement with performance
repercussions.
Maybe it is possible to check the expression for bigint exponents and, if
so, call a special algorithm like lazy series. There are likely to be
special cases of series expansion algorithms in the future, anyway, e.g. a
call to fast univariate expansion via flint.
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Ticket URL: <http://trac.sagemath.org/ticket/12589#comment:13>
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