#17700: wrong symbolic results in case the answer is not known
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Reporter: jakobkroeker | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.5
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: todo |
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A failing example is taken from
http://ask.sagemath.org/question/10388/testing-inequalities-in-sage/
{{{
var('a','b')
bool( abs(a+b) <= abs(a) + abs(b) ) # False, expected True or 'Unknown'
assert (not False == bool( abs(a+b) <= abs(a) + abs(b) ) ) #fails
}}}
see also discussion at
https://groups.google.com/d/msg/sage-devel/vNxnHSeRBW4/0OpeL0yv9YUJ
In that thread the exception variant is preferred in case of 'don't know'
Please also take into consideration Tristate variants
( A sandbox for a Tristate class:
https://github.com/jakobkroeker/Tristate.py )
--
Ticket URL: <http://trac.sagemath.org/ticket/17700>
Sage <http://www.sagemath.org>
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