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Condition in replacement rule

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67736] Condition in replacement rule
  • From: "wandering.the.cosmos at gmail.com" <wandering.the.cosmos at gmail.com>
  • Date: Thu, 6 Jul 2006 06:52:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I have a replacement rule that goes like

A[V,W_] -> A[V,W] + B[W]

but I want to perform this replacement if and only if V and W are not
the same. It seems

A[V,W_/;W!=V] -> A[V,W] + B[W]

does not seem to work. How should I do this?

Thanks!


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