#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-6.8
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: pynac-0.3.9.3/-0.4.3 | Stopgaps: todo
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Comment (by rws):
The second issue this ticket depends on concerns the Maxima interface in
item 5. Although Pynac will handle this there is e.g.:
{{{
sage: from sage.symbolic.relation import test_relation_maxima
sage: test_relation_maxima(I>0)
False
}}}
but in Maxima
{{{
(%i8) is(I>0);
(%o8) unknown
}}}
so the 'unknown' result should raise a `NotImplementedError` in
`__nonzero__` because Maxima does not distinguish between `known
undecidable` and `unknown`.
--
Ticket URL: <http://trac.sagemath.org/ticket/17700#comment:9>
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