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