FULLSIMPLIFY and Subscripted Variables
- To: mathgroup at smc.vnet.net
- Subject: [mg25799] FULLSIMPLIFY and Subscripted Variables
- From: Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil>
- Date: Wed, 25 Oct 2000 03:53:53 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Within the past few weeks an example was shown for using
FullSimplify on an equation using the variable x_subscript0. If I've done
the work correctly, I just want to show that Mathematica produced an
'incorrect' result using x_subscript that is fixed if the Utilities Notation
is used first. Here is the example:
expr= (-I*Cos[F] + Sin[F]*Subscript[x, 0])^2*(1 - 2*Subscript[x,
0]^2 + 2*Cos[2*F]*(-1 + Subscript[x, 0]^2))
The example submitted to Mathgroup performed a FullSimplify on this
expression using the subscripted x and just x to show that Mathematica got a
so called 'nicer' form of the simplified expression when using a subscripted
variable. I tested this out in the following way to verify it:
expr1=expr//Expand
expr1//FullSimplify
expr2=%//Expand
expr1==expr2
The results using x only returned True for expr1==expr2, however it
didnt when using x_subscript0, i.e. the FullSimplify was wrong for the
subscripted x. Then I repeated the above steps but first loaded the
UtilitiesNotation and then Symbolize[x_] and then the above steps returned
True for expr1==expr2...
Jerry Blimbaum NSWC Panama City, Fl