RE: Simplify expressions

*To*: mathgroup at smc.vnet.net*Subject*: [mg47892] RE: [mg47856] Simplify expressions*From*: "David Park" <djmp at earthlink.net>*Date*: Thu, 29 Apr 2004 19:39:38 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Thomas, On Mathematica 5.0.0 Simplify[a + z*k^(b - 1)*c^(d - 1), y == z*k^b*c^d] a + y/(c*k) David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: Thomas Steger [mailto:steger at wif.gess.ethz.ch] To: mathgroup at smc.vnet.net Consider the following expression: a+z*k^(b-1)*c^(d-1) Given that y==z*k^b*c^d I would like Mathematica to simplfy the preceding expression to: a+y/(k*c) However, the following command does not work Simplify[a + z*k^(b - 1)*c^(d - 1), y == z*k^b*c^d] Does anyone has a suggestion? Thanks, Thomas