Re: Equations over Domains with Mathematica 4?
- To: mathgroup at smc.vnet.net
- Subject: [mg103079] Re: Equations over Domains with Mathematica 4?
- From: Emu <samuel.thomas.blake at gmail.com>
- Date: Mon, 7 Sep 2009 02:35:48 -0400 (EDT)
- References: <h80705$18i$1@smc.vnet.net>
On Sep 6, 9:38=C2 pm, Martin Harborth <martin.harbo... at yahoo.de> wrote:
> For the following equation, I want to get only the solutions
> for z where z is real:
>
> Reduce[13219.56 == 20000/1.95583 * (1 + z)^11, z]
>
> It is suggested that one uses
>
> Reduce[13219.56 == 20000/1.95583 * (1 + z)^11, z, Reals]
>
> But I use Mathematica 4 and it seems that Reduce does not have
> this option in this Mathematica version.
>
> Can I anyway constrain the solution space with Mathematica 4?
>
> Thanks in advance
> M. Harborth.
The following works
In[1]:=$Version//InputForm
Out[1]//InputForm="4.2 for Mac OS X (August 22, 2002)"
In[2]:=Select[z/.Solve[13219.56=000/1.95583*(1+z)^11,z],#=E2=88=88=
Reals&]
Out[2]={0.0236182}
or
In[3]:=Select[Reduce[13219.56=000/1.95583*(1+z)^11,z],Last[#]
=E2=88=88Reals&]
Out[3]=z==0.0236182
Sam