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solve x*exp(x)==0 and x*exp(-x)==0

asked 2012-03-12 02:06:03 -0500

amalea gravatar image

updated 2012-03-12 02:11:31 -0500

DSM gravatar image
sage: solve(x*exp(x)==0,x)
[x == 0, e^x == 0]

but

sage: solve(x*exp(-x)==0,x)
[x == 0]

How can i avoid the e^x==0 in the solutionlist?

Thanks for help.

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In Maxima 5.26.0 both solutions are [x=0] so I hope the problem will vanish soon

achrzesz gravatar imageachrzesz ( 2012-03-12 02:53:51 -0500 )edit

Huh, identical timings! Yes, #10682 should take care of it, and has positive review.

kcrisman gravatar imagekcrisman ( 2012-03-12 02:55:00 -0500 )edit

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answered 2012-03-12 02:54:01 -0500

kcrisman gravatar image

This should be fixed in Sage 5.0, because of Trac 10682. Compare the following (old and new versions of Maxima):

Maxima 5.23.2 http://maxima.sourceforge.net
using Lisp ECL 11.1.1
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) solve(x*%e^x=0,x);
                                         x
(%o1)                          [x = 0, %e  = 0]

Maxima 5.26.0 http://maxima.sourceforge.net
using Lisp SBCL 1.0.24
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.
(%i2) solve(x*%e^x=0,x);
(%o2)                               [x = 0]
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Asked: 2012-03-12 02:06:03 -0500

Seen: 274 times

Last updated: Mar 12 '12