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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





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