#19040: rewrite Expression.__nonzero__()
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Reporter: rws | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.9
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:44 vdelecroix]:
> Replying to [comment:43 rws]:
> > Agreed if we look at equalities. Inequalities can be undecidable if we
know one side has no order relation. I don't know if there could be other
reasons. I haven't decided yet if `__nonzero__` should throw an exception
for this.
>
> What do you mean? Do you have an example of such inequality?
Comparison of real/infinity with complex.
> > >`for all x, exists y, for all z expr(x,y,z)`
> > Such will not be in the first versions.
>
> But do you have a syntax in mind for it. It would be cool to not
multiply ad libitum the `satisfiable`, `holds`, etc which are exactly the
same thing with a choice of quantifiers.
No syntax in my mind. There could be precedents in SMT-solvers which could
be copied.
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Ticket URL: <http://trac.sagemath.org/ticket/19040#comment:45>
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