Re: Bug in Solve?
- To: mathgroup at smc.vnet.net
- Subject: [mg17678] Re: Bug in Solve?
- From: Pierre infelta <pierre.infelta at epfl.ch>
- Date: Fri, 21 May 1999 23:58:58 -0400
- Organization: EPFL
- References: <7grfct$e1b@smc.vnet.net> <7h4jse$ekb@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
actually, I do not understand the solution.
If I subtitue the solution found by mathematica into the expression in
Solve, I do not find zero!!!
In[5]:=
sol = Solve[1 + a*b + Sqrt[1 + a^2]*Sqrt[1 + b^2] == 0, a]
Out[5]=
{{a -> b}}
In[6]:=
1 + a*b + Sqrt[1 + a^2]*Sqrt[1 + b^2] /. sol
Out[6]=
{2 + 2*b^2}
Adam Price wrote:
>
> On 6 May 1999 03:12:29 -0400, Ilya Zavorine <iaz at cs.umd.edu> wrote:
> >Solve[1+a*b+Sqrt[1+a^2]*Sqrt[1+b^2]== 0,a]
> >
> >{{a->b}}
> >
> >which is obviously wrong. Is this a Mathematica bug or
> >am I doing something wrong?
>
> If you are sure this is the wrong answer, then you are not entering the
> equation properly. My pencil and paper agrees with what Mathematica tells
> you.
>
> -Adam