#17852: Small cleanup in rings.arith and rings.integer
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.6
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers: Jeroen Demeyer
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/17852 | faf206825e26344ae20fbe41363b00ba4e301c07
Dependencies: #16878 | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:72 jdemeyer]:
> Sorry but I still don't like the `binomial` code.
>
> In particular, do we really need the coercion there? The arguments `x`
and `m` play a very different role, note that `m` is immediately converted
to an integer anyway.
I am not sure I understand. You don't want the case 2 that tries to
convert `x` to an integer? It is much faster that way for real or rational
input that are actually integers.
> Also, the check that `factorial(m)` is invertible has no mathematical
meaning and should just be removed.
I am not sure that what I did in the branch is the best, but there is
definitely something that needs to be specified (see #12179). Would you be
satisfied with
{{{
sage: factorial(Zmod(12)(10), 4)
3
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17852#comment:78>
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