#12322: invalid simplification of complex logarithm
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Reporter: mjo | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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As pointed out by J.H. Davenport in this sage-support thread,
http://groups.google.com/group/sage-
support/browse_thread/thread/f9d2209041775c3e
the following (invalid) log simplification is made:
{{{
sage: t = var('t')
sage: assume(t, 'complex')
sage: assumptions()
[t is complex]
sage: f = (1/2)*log(2*t) + (1/2)*log(1/t)
sage: f.full_simplify()
1/2*log(2)
}}}
When, for example, t=-1,
{{{
sage: f(t = -1)
I*pi + 1/2*log(2)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12322>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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