#1956: implement multivariate truncated power series arithmetic
-------------------------------------------+--------------------------------
Reporter: was | Owner: pernici
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7
Component: commutative algebra | Keywords: multivariate
power series
Work_issues: | Upstream: N/A
Reviewer: Martin Albrecht, Simon King | Author: Niles Johnson
Merged: | Dependencies:
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Changes (by niles):
* status: needs_work => needs_review
Old description:
> Multivariate truncated power series arithmetic has been requested a
> *lot*.
>
> == Apply: ==
>
> 1. [attachment:trac_1956_combined_2.patch]
>
> This is a single patch combining all of the partial patches now attached
> to this ticket.
New description:
Multivariate truncated power series arithmetic has been requested a *lot*.
== Apply: ==
1. [attachment:trac_1956_combined_3.patch]
This is a single patch combining all of the partial patches now attached
to this ticket.
--
Comment:
Now I've added `combined_3.patch`: It changes `TypeError` to `ValueError`
as suggested above, and also in one other place (where again input of
wrong length raises the error). The error types in the rest of the code
seem good to me.
I've also changed the name of the indeterminate in the background power
series ring from `'T'` to `'Tbg'`. It's conceivable that bugs could arise
if a user happens to work with a multivariate power series ring, and also
with a univariate power series ring having the same indeterminate name as
that of the background ring of the multivariate ring.
Since I don't know exactly how these might come up, if ever, I'd like to
let this be sufficient for now, and add a more robust system of
protections against possible bugs in a separate ticket.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/1956#comment:118>
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