#8198: p-adic precision in vector multiplication
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Reporter: wuthrich | Owner: roed
Type: defect | Status: new
Priority: major | Milestone: sage-4.5.2
Component: padics | Keywords: padics vector
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by niles):
* cc: niles (added)
Comment:
I found this bug also, while working on #9457. After a fair bit of
struggling with elliptic curve code, I now think this is a significant
part of the problem.
I noticed the following also; I can't tell if it's the same bug or not.
{{{
sage: R = QQ.completion(5,5)
sage: P.<T> = R[]
sage: Q.<T> = R[[]]
sage: P(R(0).add_bigoh(-1))
(O(5^-1))
sage: Q(R(0).add_bigoh(-1))
0
sage: P(R(0).add_bigoh(2))
(O(5^2))
sage: Q(R(0).add_bigoh(2))
0
sage: Q(R(1).add_bigoh(2))
1 + O(5^2)
sage: Q(R(1).add_bigoh(-1))
0
sage: Q(R(1/25).add_bigoh(-1))
5^-2 + O(5^-1)
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8198#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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