#12353: wrong comparison between RealIntervalField and RealField
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Reporter: zimmerma | Owner: AlexGhitza
Type: defect | Status: new
Priority: blocker | Milestone: sage-5.0
Component: basic arithmetic | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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consider the following:
{{{
sage: RealIntervalField(53)(-1) > RR(1)
False
sage: RealIntervalField(54)(-1) > RR(1)
True
}}}
The second answer is clearly wrong.
The problem seems to be the following: the {{{_richcmp}}} function
from {{{structure/element.pyx}}} is called. With precision 54, the
call to {{{coercion_model.canonical_coercion}}} fails, then we have
{{{r=1}}}, the two tests around line 853 fail, and the returned value is
{{{_rich_to_bool(op, r)}}} which does not depend on {{{left}}} and
{{{right}}}!
Paul
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12353>
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