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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