Re: Simplify Oddity
- To: mathgroup at smc.vnet.net
- Subject: [mg59423] Re: [mg59399] Simplify Oddity
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 9 Aug 2005 03:30:51 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
f1=g (g/r)^(k-1);
f2=g^k/r^(k-1);
expr=f1/f2;
Your expression is not always 1. For example,
{f1,f2,expr}/.{g->1,r->-1,k->2.4}
{-0.3090169943749476 - 0.9510565162951535*I,
-0.3090169943749476 + 0.9510565162951535*I,
-0.8090169943749472 + 0.5877852522924735*I}
Simplify[expr,Element[k, Integers]]
1
Bob Hanlon
>
> From: AES <siegman at stanford.edu>
To: mathgroup at smc.vnet.net
> Date: 2005/08/08 Mon AM 03:34:51 EDT
> Subject: [mg59423] [mg59399] Simplify Oddity
>
> I'm supposing that the following rather odd result has something to do
> with Mathematica being concerned that g or r (or k?) might be complex
> numbers?
>
> In[151] :=
>
> f1 = g (g/r)^(k-1);
>
> f2 = g^k/r^(k-1);
>
> f1/f2 // FullSimplify
>
> Out[151] = g^(-k) (g/r)^k r^k
>
> But shouldn't Mathematic be able to simplify this to unity nonetheless?
> -- maybe without even invoking Simplify?
>
>