#10682: sum fails with lower bound != 0 or 1
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Reporter: fmaltey | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Description changed by mboratko:
Old description:
> I test
> {{{
> sage: var ('n,k')
> sage: sum (binomial(n,k)*k2, k, 0, n) # is right
> sage: sum (binomial(n,k)*k2, k, 1, n) # is right n(n+1)2^(n-2)
> sage: sum (binomial(n,k)*k2, k, 2, n) # is false : I get 0
> }}}
New description:
I test
{{{
sage: var ('n,k')
sage: sum (binomial(n,k)*k^2, k, 0, n) # is right
sage: sum (binomial(n,k)*k^2, k, 1, n) # is right n(n+1)2^(n-2)
sage: sum (binomial(n,k)*k^2, k, 2, n) # is false : I get 0
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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