#1956: implement multivariate power series arithmetic
-----------------------------------+----------------------------------------
Reporter: was | Owner: malb
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.0
Component: commutative algebra | Keywords: multivariate power series
Author: niles | Upstream: N/A
Reviewer: | Merged:
Work_issues: Fix doctests |
-----------------------------------+----------------------------------------
Changes (by niles):
* work_issues: Fix doctests; fix __contains__; add syntactical sugar =>
Fix doctests
Comment:
Thanks for the tips!
Replying to [comment:11 SimonKing]:
> 1. {{{__contains__}}} and coercion
{{{__contains__}}} is now inherited, and non-standard behaviour fixed (I
wasn't aware of the standard).
>
> 2. Use of double-underscore methods
I have fixed as many of these as I could find (probably all of them, but
let me know if there are more issues).
>
>
> I am now running {{{make ptestlong}}}, and will then have a closer look
at the code - so, no review yet. But I think you should address the points
above.
Indeed; I have found that my installation of sage fails some long doctests
even before the patches are applied, so I will have to do a fresh
installation before I can test this myself properly.
Also, I had some time to kill so I've added support for the double bracket
method, and this is included in the documentation.
{{{
sage: ZZ[['s,t,u']]
Multivariate Power Series Ring in s, t, u over Integer Ring
}}}
Finally, with a little more free time I added support for {{{exponents}}}
and a basic version of the verschiebung, {{{V}}}. These were among the
pile of not-yet-implemented methods inherited from univariate power
series.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/1956#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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