#20105: expand difference of relations before evaluation to a boolean
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Reporter: behackl | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: symbolics | Resolution:
Keywords: pynac | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: pynac-0.6.3 | Stopgaps:
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Old description:
> As described in [https://groups.google.com/forum/#!topic/sage-
> devel/ojHqBy7oUVU this discussion], we currently have
> {{{
> sage: bool(x^2 - 1 - (x+1)*(x-1) != 0)
> True
> }}}
> This can be fixed on a pynac-level by expanding the difference between
> the left-hand side and the right-hand side of the relational expression.
> See https://github.com/pynac/pynac/pull/139.
>
> This ticket shall add doctests as soon as a new pynac version is
> released.
New description:
As described in [https://groups.google.com/forum/#!topic/sage-
devel/ojHqBy7oUVU this discussion], we currently have
{{{
sage: bool(x^2 - 1 - (x+1)*(x-1) == 0)
False
}}}
This can be fixed on a pynac-level by expanding the difference between the
left-hand side and the right-hand side of the relational expression. See
https://github.com/pynac/pynac/pull/139.
This ticket shall add doctests as soon as a new pynac version is released.
--
Comment (by rws):
Ok confirmed.
{{{
sage: bool(x^2 - 1 - (x+1)*(x-1) != 0)
True
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20105#comment:7>
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