#18393: make Expression.series return an element of SR[[]]
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Reporter: rws | Owner:
Type: | Status: positive_review
enhancement | Milestone: sage-duplicate/invalid/wontfix
Priority: major | Resolution:
Component: calculus | Merged in:
Keywords: | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by rws):
Replying to [comment:12 mmezzarobba]:
> ...And (FWIW) that's also what Maple does:
> {{{
> #-->s := series(sin(x),x);
> s := series(1*x-1/6*x^3+1/120*x^5+O(x^7),x,7)
> #-->t := series(exp(x),x);
> t := series(1+1*x+1/2*x^2+1/6*x^3+1/24*x^4+1/120*x^5+O(x^6),x,6)
> #-->s*t;
>
(series(1*x-1/6*x^3+1/120*x^5+O(x^7),x,7))*(series(1+1*x+1/2*x^2+1/6*x^3+1/24*x^4+1/120*x^5+O(x^6),x,6))
> #-->series(s*t,x);
> series(1*x+1*x^2+1/3*x^3-1/30*x^5+O(x^6),x,6)
> }}}
> But perhaps I misunderstood the question?
Interesting. But that can be considered a bug and see the sage-devel link
for a bug report. I mean, what else do you expect as result when dealing
with a series? But I'll open a new ticket for that.
--
Ticket URL: <http://trac.sagemath.org/ticket/18393#comment:13>
Sage <http://www.sagemath.org>
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