#17489: remove redundant factorial() from rings/arith.py
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Reporter: rws | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers: Jeroen Demeyer
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/remove_redundant_factorial___from_rings_arith_py|
3b54c755b2da09d40872276d0d95d941ddcdea66
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:19 jdemeyer]:
> Another idea I had which should probably be done first is to make a new
class `NumberTheoreticFunction` which would include the `factorial` and
`binomial` function. That class could then be customized to use `_evalf_`
when given integers as input.
When adding the missing `rising/falling/sub/multi_factorial` there is
already the case for a separate file containing functions mainly defined
over the integers---or two, one for number theoretic, the other
combinatorial entries. So maybe not `NumberTheoreticFunction` but
`ZZDomainFunction` in the file `number_theoretic.py`?
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Ticket URL: <http://trac.sagemath.org/ticket/17489#comment:20>
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