#7532: "return NotImplementedError" in ring.pyx
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Reporter: was | Owner: cremona
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.3.1
Component: elliptic curves | Resolution: fixed
Keywords: | Author: John Palmieri
Upstream: N/A | Reviewer: Tim Dumol
Merged: | Work_issues:
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Comment(by cremona):
I have got to the bottom of (at least) the problem with
monsky_washnitser.py. A quantity D is computed which is in
{{{(Z/NZ)[[t]]}}} and non-zero, where N is a prime power not a prime. At
some point in the code we need 1/D. This crashes (while {{{D^(-1)}}} is
OK). IN the inversion, soemone asks if the parent of D is an integral
domain which cannot be determined, which raises a run-time error. Before
the patch it *returned* the error, and as it was returning something
nonzero that was interpreted by python as "True".
I think I can fix this, but I am still working on it. It will need a new
patch -- sorry to have muddled matters by putting onto this ticket a patch
which belonged to #7535.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7532#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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