Re: Simplify expressions

*To*: mathgroup at smc.vnet.net*Subject*: [mg47906] Re: Simplify expressions*From*: "David W. Cantrell" <DWCantrell at sigmaxi.org>*Date*: Thu, 29 Apr 2004 19:40:09 -0400 (EDT)*References*: <c6q9rr$rr6$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

steger at wif.gess.ethz.ch (Thomas Steger) wrote: > 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? What version are you using? Using version 5.0.0, what you wanted to work does work: In[1]:= Simplify[a + z*k^(b - 1)*c^(d - 1), y == z*k^b*c^d] Out[1]= a + y/(c*k) David Cantrell