#17422: symbolic sums with known parameters should simplify()
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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A minimal case:
{{{
sage: (k,n) = var('k,n')
sage: f(n)=sum(abs(-k*k+n),k,1,n)
sage: f(n=8)
sum(abs(-k^2 + 8), k, 1, 8)
}}}
I would expect `f(n=8).simplify()` or `.expand()` to give me the result
`162` but this does not work.
Related to #9424. One may depend on the other. Relevant questions were:
* http://ask.sagemath.org/question/9937/how-do-i-evaluate-sum-containing-
factorial/
* http://ask.sagemath.org/question/24911/exponentiation-makes-a-formula-
go-crazy/
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Ticket URL: <http://trac.sagemath.org/ticket/17422>
Sage <http://www.sagemath.org>
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