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