#12575: Generic p-adic log and exp
-----------------------------------------------------------+----------------
Reporter: mmasdeu | Owner:
Type: enhancement | Status:
needs_review
Priority: major | Milestone:
sage-5.7
Component: padics | Resolution:
Keywords: exp, log, padic | Work issues:
Report Upstream: N/A | Reviewers:
David Loeffler, David Roe, Julian Rueth
Authors: Amnon Besser, Marc Masdeu, Julian Rueth | Merged in:
Dependencies: #13539 | Stopgaps:
-----------------------------------------------------------+----------------
Changes (by {'newvalue': u'Amnon Besser, Marc Masdeu, Julian Rueth',
'oldvalue': u'Amnon Besser, Marc Masdeu'}):
* owner: saraedum =>
* reviewer: David Loeffler, David Roe => David Loeffler, David Roe,
Julian Rueth
* dependencies: => #13539
* author: Amnon Besser, Marc Masdeu => Amnon Besser, Marc Masdeu, Julian
Rueth
Comment:
I found several issues. I added a patch which should fix them:
* log sometimes didn't work in the capped-absolute case (especially over
extension fields)
* the bound {{{max_term}}} in {{{_exp}}} was incorrect which made
{{{exp}}} and {{{log}}} not inverse to each other in some cases
* the capped-absolute/fixed-mod implementation of {{{exp}}} somehow didn't
get some of the digits right (I tried to find out why, but couldn't figure
it out). I rewrote {{{_exp}}} which is now shorter and works in the cases
that didn't work before. In particular it doesn't lift the input to the
integers anymore. Is there a reason why we should work over the integers?
* I believe that the check for convergence of the exponential series was
incorrect.
Apart from that, I tried to simplify the code in a few places and turned
the cached values into actual {{{cached_methods}}} -- if someone dislikes
that latter change, I don't mind undoing it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12575#comment:21>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
