       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>

```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
>
>

```

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