On Aug 28, 10:47 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Thu, Aug 28, 2008 at 8:57 AM, Roger <[EMAIL PROTECTED]> wrote:
>
> > solve([x==0, 1-exp(y)==0],x,y)
> > returns the empty set, although (0,0) is an obvious solution. This
> > occurs also for other simple combinations involving exp, as well as
> > for
> > solve([y*sin(x)==0, cos(x)==0],x,y)
>
> > What am I doing wrong? Thanks. (Sage 3.0.2 on Mac OSX)
>
> Sage uses Maxima's solve command, and Maxima's solve
> command is pretty wimpy, and we (Sage developers) intend
> to write our own new solve command that can deal with
> more general equations.
>
> Here's an illustration of maxima not solving the above equations
>
> sage: !maxima
> (%i2) solve([x=0, 1-exp(y)=0],[x,y]);
> (%o2) []
> (%i3) solve([y*sin(x)=0, cos(x)=0],[x,y]);
> (%o3) []
Yeah, and it is also broken in the latest Maxima (since William might
have used the Maxima from Sage 3.1.1):
Maxima 5.16.2 http://maxima.sourceforge.net
Using Lisp CLISP 2.46 (2008-07-02)
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=0, 1-exp(y)=0],[x,y]);
(%o1) []
(%i2) solve([y*sin(x)=0, cos(x)=0],[x,y]);
(%o2) []
(%i3)
Since Robert Dodier is not subscribed to sage-support I am CCin him
here.
> You can read the help on maxima's solve, if you want to get
> a sense of its limitations.
>
> sage: maxima.solve?
>
> William
Cheers,
Michael
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