#20062: Make _floordiv_() for power series a deprecated alias for _div_()
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Reporter: pbruin | Owner:
Type: task | Status: needs_review
Priority: minor | Milestone: sage-7.1
Component: algebra | Resolution:
Keywords: | Merged in:
Authors: Peter Bruin | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/pbruin/20062-PowerSeries_floordiv| e9719f7399ffab100407a360c16fe0596e7f2689
Dependencies: | Stopgaps:
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Comment (by pbruin):
Replying to [comment:8 bruno]:
> Note that there exists a method `quo_rem` for `DiscreteValuationRing`s
which works.
Yes, I added that in #20283.
> Thus it should be possible to use it to get a method `__floordiv__`. I
am not sure to understand the subtleties described in comment:5 and
comment:6, but at least there is some working code. For instance:
>
> {{{#!python
> sage: R.<x> = QQ[[]]
> sage: R(1).quo_rem(1+t)
> (1 - t + t^2 - t^3 + t^4 - t^5 + t^6 - t^7 + t^8 - t^9 + t^10 - t^11 +
t^12 - t^13 + t^14 - t^15 + t^16 - t^17 + t^18 - t^19 + O(t^20),
> 0)
> }}}
Yes, absolutely. There are two problems: (1) due to the problem mentioned
in comment:5, it seems that we cannot easily implement a generic
`__floordiv__` using `quo_rem` for all Euclidean domains simultaneously,
and (2) in view of backward compatibility it would not be very good to
change the behaviour of `__floordiv__` without any warning or deprecation
of the old behaviour.
--
Ticket URL: <http://trac.sagemath.org/ticket/20062#comment:9>
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