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algebraic ReplaceAll?

  • To: mathgroup at
  • Subject: [mg122245] algebraic ReplaceAll?
  • From: Dushan Mitrovich <dushanm at>
  • Date: Sat, 22 Oct 2011 06:06:53 -0400 (EDT)
  • Delivered-to:

Is there a way to get ReplaceAll to actalgebraically, so it recognizes 
the negative of a replaced quantity as well as the positive?  For 
example, this works
     In:   x-w /. x-w->y
     Out: y

but these don't
     In:   -x+w /. x-w->y
           w-x  /. x-w->y
     Out: w-x

- Dushan

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