#6420: Maxima integration error with 1/x^3
------------------------+---------------------------------------------------
Reporter: mora | Owner: mhansen
Type: defect | Status: new
Priority: major | Milestone: sage-4.1
Component: interfaces | Keywords: maxima integral
Reviewer: | Author:
Merged: |
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{{{
sage: integrate(1/x^3,x,1,infinity)
ValueError: Integral is divergent.
}}}
But it's NOT!
The problem comes from Maxima. I could check four versions:
{{{
Maxima 5.13.0: it's ok
Maxima 5.16.3: it gives wrong result, Sage 4.0.2 uses this
Maxima 5.17.1: it gives wrong result
Maxima 5.18.1: it's ok
}}}
An example for wrong result:
{{{
pe...@desktop:~/download/sage/sage-4.0.2-linux-
Ubuntu_9.04-i686-Linux/local/bin$ ./maxima
Maxima 5.16.3 http://maxima.sourceforge.net
Using Lisp ECL 9.4.1
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) integrate(1/x^3,x,1,inf);
Integral is divergent
-- an error. To debug this try debugmode(true);
}}}
We would like to teach undergradute students with Sage, and this bug is
quite annoying. It would be helpful, if someone could update Maxima in
Sage.
Thanks,
Peter
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6420>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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