#12121: floor/ceil can be very slow at integral values
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Reporter: dsm | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.1
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/12121 | 688ebfa077f09ee9a2bc988833ddd4f0fc65a4a1
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:28 rws]:
> Testing equality of symbolics in general is undecidable. If you remove
all expressions with variables however, it is easy: convert symbolic
constants and function expressions to float as in `N()`, compare. Of
course there are precision problems but that's nothing in comparison to
what you get with variables.
What I need is a method that either returns a reliable answer `True` or
`False` or raise an error which can either be `This comparison is
meaningless` or `I don't know how to compare this`.
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Ticket URL: <http://trac.sagemath.org/ticket/12121#comment:30>
Sage <http://www.sagemath.org>
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