#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 eviatarbach):
I started doing some work on this. Since Sage already has an `Unknown`
object for representing indeterminate truth values, I thought we could
adapt it for use here. Ticket #20920 makes some changes to `Unknown` to
raise an error when attempting to evaluate its truth value with
`__nonzero__`, as well as adding an `Undecidable` object.
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Ticket URL: <https://trac.sagemath.org/ticket/17700#comment:11>
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