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MathGroup Archive 2004

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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


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