#18630: Expression.is_positive/negative incomplete
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: Not yet reported upstream;
Work issues: | Will do shortly.
Commit: | Branch:
Stopgaps: | Dependencies:
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The two functions that query Pynac expressions' `info::flags` only work
with `numeric`s and `symbol`s with domain. The rest simply returns
`False`:
{{{
sage: (1-pi).is_negative()
False
sage: (log(1/2)).is_negative()
False
sage: e.is_positive()
False
sage: (e+1).is_positive()
False
sage: (2*e).is_positive()
False
sage: (e^3).is_positive()
False
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18630>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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