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MathGroup Archive 2000

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Option ExcludedForms

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21736] Option ExcludedForms
  • From: Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil>
  • Date: Wed, 26 Jan 2000 03:45:36 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

	A question was asked recently about a problem with Simplify and
FullSimplify concerning the following expression:

	expr =(3*x + (x - y)*Log[x] + (x - y)*Log[-1 + y/x])/(x - y)
	
	and why didnt these commands simply divide thru the (x-y) terms.
The following does that:


	FullSimplify[ expr,ExcludedForms->{x-y}]

	I have found ExcludedForms quite helpful but wondered why is this
only available for FullSimplify and not Simplify.   One of the responses I
got back was that 

	Simplify[expr,TransformationFunctions->{x-y}]

	should do the same thing but it doesnt.  So my question remains why
this Exclusion option is only available for FullSimplify?

	thanks.  jerry blimbaum



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