Re: Beginner-type question
- To: mathgroup at smc.vnet.net
- Subject: [mg4061] Re: [mg4028] Beginner-type question
- From: Ralheid at aol.com
- Date: Thu, 30 May 1996 02:49:38 -0400
- Sender: owner-wri-mathgroup at wolfram.com
lopez....asks
>I often encounter output of the form
> Out[1]= Sqrt[a^2] ,
>where I know a is real and positive, and therefore would like to see
> Out[1]= a .
>How do I get Mathematica to assume that all quantities are real? Real
>and positive? Can this be done globally, for an entire session?
Thr following seems to supply your desire
In[1]:=
eqn = ans - Sqrt[a^2]==0
Out[1]=
-Sqrt[ a^2 ] + ans == 0
In[2]:=
Solve[%,a]
Out[2]=
{{a -> -ans}, {a -> ans}}
Regards:
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