#11767: elliptic_logarithm of high precision points often hangs forever
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Reporter: was | Owner: cremona
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.2
Component: elliptic curves | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by cremona):
Paul, thanks. I trust your knowledge of binary floating point issues as
being much better than my own. Are you saying that even with your patch
the termination condition may never hold and hence we loop forever?
Bearing in mind that I already doubled the precision (prec2 = 2*prec)
should we perhaps change {{{1-2^(-prec2)}}} to {{{ 1-2^(-prec2+1)}}}? If
that would mean that termination is then guaranteed?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11767#comment:8>
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