#18081: Expression.factor_list() result inconsistent
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
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:
> {{{
> sage: (1-2^(-s)).factor_list()
> [(2^s - 1, 1), (2^s, -1)]
> sage: (1/(1-2^(-s))).factor_list()
> [(2^s - 1, -1), (2, s)]
> }}}
> I would have expected the first expression to have `(2, -s)` or the
> second to have `(2^s, 1)`.
New description:
{{{
sage: (1-2^(-s)).factor_list()
[(2^s - 1, 1), (2^s, -1)]
sage: (1/(1-2^(-s))).factor_list()
[(2^s - 1, -1), (2, s)]
}}}
I would have expected the first expression to have `(2, -s)` or the second
to have `(2^s, 1)`.
Also, this looks odd:
{{{
sage: (1/(1-x)).factor_list()
[(x - 1, -1), (-1, 1)]
sage: (1-x).factor_list()
[(-x + 1, 1)]
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18081#comment:1>
Sage <http://www.sagemath.org>
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