       Re: factor out a term to cancel in a fraction

• To: mathgroup at smc.vnet.net
• Subject: [mg98891] Re: [mg98818] factor out a term to cancel in a fraction
• From: "David Park" <djmpark at comcast.net>
• Date: Mon, 20 Apr 2009 19:15:15 -0400 (EDT)
• References: <26860798.1240206105825.JavaMail.root@n11>

```step1 = p'[t] == (e0 s[t] k1 k2)/(s[t] k1 + k1 Km)

MapAt[Cancel, step1, 2]

David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/

From: sean_incali at yahoo.com [mailto:sean_incali at yahoo.com]

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

```

• Prev by Date: Re: integrate problem
• Next by Date: Alignment of Graphics Within Expressions
• Previous by thread: Re: factor out a term to cancel in a fraction