#11411: some q binomial coefficients should be zero
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Reporter: chapoton | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: minor | Milestone:
Component: combinatorics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: Florent Hivert | Author: Frédéric Chapoton
Merged: | Dependencies:
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Comment(by hivert):
Hi Frédéric,
> This seems to be ok, except the q_binomial procedure, where I have some
concern.
>
> I think that, like the usual binomial coefficients, there is a natural
extension of the q-binomial coefficients to the case (n,k) with negative
k.
>
> Either one has to find this extension somewhere in the litterature, or
we should leave the negative n case as NotImplemented.
>
> Well, I do not know. Maybe what you did is a correct temporary solution.
A quick search on the web didn't gave me anything. So I have the
impression
that this negative extension is not quite standard. Anyway, I corrected
the
error messages.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11411#comment:12>
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