Re: factor out a term to cancel in a fraction
- To: mathgroup at smc.vnet.net
- Subject: [mg98847] Re: factor out a term to cancel in a fraction
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Mon, 20 Apr 2009 05:46:43 -0400 (EDT)
- Organization: Uni Leipzig
- References: <gsh178$o8$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
eqn = p'[t] == (e0 s[t] k1 k2)/(s[t] k1 + k1 Km);
and
eqn /. a_ == b_ :> a == Cancel[b]
or
Cancel[eqn]
or
Simplify[eqn]
or
FullSimplify[eqn]
or
eqn /. a_*k1 + b_*k1 :> (a + b)*k1
will do it and it seems difficult to hinder Mathematica
to cancel k1.
Regards
Jens
sean_incali at yahoo.com wrote:
> Hello group.
>
> I'm trying to do a little algebra which i can do in my head using
> Mathematica. Why? Well, it's neater.
>
> Consider the following.
>
>
> p'[t] == (e0 s[t] k1 k2 )/ (s[t] k1 + k1 Km)
>
> Factor out k1 and cancel it to simplify the expression. Why is this so
> difficult to accomplish in mathematica? Following does nothing.
>
> p'[t] == (e0 s[t] k1 k2 )/ (s[t] k1 + k1 Km) //
> Assuming[k1 > 0, {Collect[#, k1]}] &
>
>
> Thanks for any info.
>
> Sean
>
>