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Bug in ReplaceAll and ReplaceRepeated?

  • To: mathgroup at
  • Subject: [mg44018] Bug in ReplaceAll and ReplaceRepeated?
  • From: Artūras Acus <acus at>
  • Date: Fri, 17 Oct 2003 05:14:56 -0400 (EDT)
  • Organization: Institute of Theoretical Physics and Astronomy
  • Sender: owner-wri-mathgroup at


Sqrt[(X + Y + Z)^2] //. {Z -> 2, (a_ + b_)^c_ :> Expand[(a + b)^c]}

don't replace Z with 2. If I remove c in right hand side of second rule,
works as expected. 

is the following behaviour bug or the feature?
In applies both to 4.1, and 5.0.

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