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MathGroup Archive 2005

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Re: Re: (x-y) DiracDelta[x-y] does not simplify to 0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56359] Re: [mg56297] Re: (x-y) DiracDelta[x-y] does not simplify to 0
  • From: Alain Cochard <alain at geophysik.uni-muenchen.de>
  • Date: Fri, 22 Apr 2005 06:24:36 -0400 (EDT)
  • References: <d42kg5$39t$1@smc.vnet.net> <d45agf$ieu$1@smc.vnet.net> <200504210936.FAA05048@smc.vnet.net> <0e5459acc0a6eae9a16bda863b79434c@mimuw.edu.pl> <16999.49105.639076.187149@localhost.localdomain> <913e334e36e5b09dce4f89131131357d@mimuw.edu.pl>
  • Reply-to: alain at geophysik.uni-muenchen.de
  • Sender: owner-wri-mathgroup at wolfram.com

Andrzej Kozlowski writes:

 > Since [use inside Integrate] is the only context in which [x
 > DiracDelta[x] == 0] is useful and makes sense, I can't see any
 > justification for your application of Simplify.

OK, I think I now understand what you say and I disagree with your
conclusion.  I indeed do find practical justifications for the use of
that identity and had so far to perform the simplifications manually.

Thanks you so much for the detailed explanations.  Thanks also to the
other contributors.

AC



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