#17393: Add warning to Expression.simplify_log()
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Reporter: mjo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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The `simplify_log()` function should only be called when the expression is
real, and I just noticed this isn't documented. For an example, take:
{{{
sage: x,y = SR.var('x,y')
sage: f = log(x*y) - (log(x) + log(y))
sage: f(x=-1, y=i)
-2*I*pi
sage: f.simplify_log()
0
}}}
The documentation does say what it will do, so if you know that the real
log identities don't hold over the complex numbers, then it's documented.
But I think it's better to warn explicitly.
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Ticket URL: <http://trac.sagemath.org/ticket/17393>
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