#19540: AsymptoticExpansion.factorial
-------------------------------------+-------------------------------------
Reporter: dkrenn | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-7.1
Component: asymptotic | Resolution:
expansions | Merged in:
Keywords: | Reviewers: Clemens Heuberger
Authors: Daniel Krenn | Work issues:
Report Upstream: N/A | Commit:
Branch: | 23948e43b8038cfe7948fab2f5058cab8f734dbd
u/dkrenn/asy/factorial | Stopgaps:
Dependencies: #19306, #19521, |
#19528, #19944 |
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Comment (by dkrenn):
Replying to [comment:9 cheuberg]:
> 1. The growth elements call `self.parent()._var_.variable_names()`. I am
wondering why they do not simply call `self.parent().variable_names()`.
> 2. Why can't a generic growth element decide on its own? It could simply
call
> {{{
> if self.is_one():
> return tuple()
> else:
> return self.parent()._var_.variable_names()
> }}}
> which would probably end in a desaster if called on a generic growth
element, but we are not supposed to instantiate generic growth elements
anyway ...
1+2: In the way it is it allows to build `n.factorial()` starting in
`AsymptoticRing('m^QQ * n^QQ', QQ)`; `self.parent().variable_names()`
would not allow this.
--
Ticket URL: <http://trac.sagemath.org/ticket/19540#comment:10>
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