#7334: Sage cannot simplify sums of logarithms
-----------------------------------+----------------------------------------
Reporter: whuss | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.3.2
Component: calculus | Keywords: logarithm
Author: Robert Mařík | Upstream: N/A
Reviewer: Karl-Dieter Crisman | Merged:
Work_issues: |
-----------------------------------+----------------------------------------
Changes (by burcin):
* status: needs_review => needs_work
Comment:
On Sage-4.3.2.alpha1, I get these doctest failures:
{{{
sage -t devel/sage-s/sage/symbolic/expression.pyx
**********************************************************************
File
"/scratch/berocal/sage/i686/sage-4.3.rc0/devel/sage-s/sage/symbolic/expression.pyx",
line 5837:
sage: (x*log(9)).simplify_log('all')
Expected:
log(9^x)
Got:
x*log(9)
**********************************************************************
File
"/scratch/berocal/sage/i686/sage-4.3.rc0/devel/sage-s/sage/symbolic/expression.pyx",
line 5849:
sage: (log(5)-log(2)).simplify_log()
Expected:
-log(2) + log(5)
Got:
log(5/2)
**********************************************************************
}}}
I don't know about the first one, but the second one seems to be
confirming a bug fix in Maxima. :)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7334#comment:16>
Sage <http://www.sagemath.org>
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