#15571: Doctest: Incorrect zero test of complex symbolic expressions
-------------------------------------+-------------------------------------
Reporter: mmezzarobba | Owner:
Type: defect | Status: positive_review
Priority: major | Milestone: sage-6.5
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers: Karl-Dieter Crisman
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/doctest__incorrect_zero_test_of_complex_symbolic_expressions|
9974eef85cab383846b82d39a39c7b5d50da1608
Dependencies: | Stopgaps:
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Changes (by kcrisman):
* status: needs_review => positive_review
* reviewer: => Karl-Dieter Crisman
Comment:
Indeed, one doesn't have to do any assumption at all to get the 'false'
now.
{{{
sage: sage: var('a,x')
(a, x)
sage: (a, x)
(a, x)
sage: sage: expr = a^(4*x) - (a^4)^x
sage: sage: expr.is_zero()
False
}}}
If you want to remove the second
{{{
+ sage: assume(a, 'complex')
+ sage: assume(x, 'complex')
}}}
and then the `forget()` which I think is all superfluous, that would be
great, but it's fine this way too.
--
Ticket URL: <http://trac.sagemath.org/ticket/15571#comment:8>
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