#18048: Bug in GAP conversion of finite field elements
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Reporter: vdelecroix | Owner:
Type: defect | Status: positive_review
Priority: critical | Milestone: sage-6.6
Component: finite rings | Resolution:
Keywords: | Merged in:
Authors: Peter Bruin | Reviewers: Vincent Delecroix
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/pbruin/18048-gap_finite_field_conversion|
61b6cb93796bc96ac72ce5eab6ecc46772335538
Dependencies: | Stopgaps:
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Changes (by vdelecroix):
* status: needs_review => positive_review
* reviewer: => Vincent Delecroix
* priority: major => critical
Comment:
Hello,
That's wonderful that you did have a look! I put this to positive review
as it fixes an important bug (and might hopefully be in sage-6.6).
On a related note, the code uses a lot of string parsing. This is ugly and
not very safe. I think that we can get rid of most of it with
- `Characteristic(z)`: the characteristic of the field
- `DegreeFFE(z)`: degree of the smallest base field containing the element
`z`
- `LogFFE(z,base)`: logarithm in finite field
I do not like the fact that we need to call `LogFFE` to have access to the
good power of the generator. If you think about a good solution for that I
will open an other ticket.
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/18048#comment:4>
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