#18896: symbolic root comparisons call Maxima unnecessarily
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> Reported in https://groups.google.com/forum/?hl=en#!topic/sage-
> support/b6OinTC9mdk
> {{{
> sage: m=540579833922455191419978421211010409605356811833049025*sqrt(1/2)
> sage: m1=382247666339265723780973363167714496025733124557617743
> sage: bool(m==m1)
> True
> }}}
> Like #18883 is another case of falling through in
> `Expression.__nonzero__` to calling Maxima which fails, in this case
> because of its hardcoded 53 bits precision.
New description:
Reported in https://groups.google.com/forum/?hl=en#!topic/sage-
support/b6OinTC9mdk
{{{
sage: m=540579833922455191419978421211010409605356811833049025*sqrt(1/2)
sage: m1=382247666339265723780973363167714496025733124557617743
sage: bool(m==m1)
True
}}}
Like #18883 is another case of falling through in `Expression.__nonzero__`
to calling Maxima which fails, in this case because of its hardcoded 53
bits precision. The reason why Maxima is called at all is that
`test_relation()` coerces `lhs()-rhs()` into `CIF` as a catch-all. The
result passes `is_zero()` so `NotImplemented` is returned.
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Ticket URL: <http://trac.sagemath.org/ticket/18896#comment:1>
Sage <http://www.sagemath.org>
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