#15571: Doctest: Incorrect zero test of complex symbolic expressions
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Reporter: mmezzarobba | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by rws):
* status: needs_review => needs_work
* milestone: sage-duplicate/invalid/wontfix => sage-6.5
Old description:
> Yet another example where symbolic expressions are abusively considered
> equivalent, even though `simplify()` has become a bit more careful.
>
> {{{
> sage: var('a,x')
> (a, x)
> sage: assume(a, 'complex')
> sage: assume(x, 'complex')
> sage: expr = a^(4*x) - (a^4)^x
> sage: expr.is_zero()
> True
> sage: expr(a=I, x=1/2)
> -2
> }}}
New description:
This is fixed but needs a doctest:
Yet another example where symbolic expressions are abusively considered
equivalent, even though `simplify()` has become a bit more careful.
{{{
sage: var('a,x')
(a, x)
sage: assume(a, 'complex')
sage: assume(x, 'complex')
sage: expr = a^(4*x) - (a^4)^x
sage: expr.is_zero()
True
sage: expr(a=I, x=1/2)
-2
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15571#comment:5>
Sage <http://www.sagemath.org>
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