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Re: Unprotect Plus, no automatic collection

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39123] Re: Unprotect Plus, no automatic collection
  • From: Friedrich Laher <mathefritz at schmieder-laher.de>
  • Date: Thu, 30 Jan 2003 01:06:21 -0500 (EST)
  • References: <b184d4$kqb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com


Friedrich Laher schrieb:
> when Unprotect[Plus]; Plus[w1,w2] = -1 is commanded
> and then the expanding of a product gives a*w1 + a*w2 + ...
> that is not collapsed to -a + ... automatically, even
> if selecting that a*w1 + a*w1 and
> the applying Simplify to it from al palette, does it.  What
> can be done to automize it?
> 
>
I got a direct answer from Mihaijlo Vanevic,
suggesting
using a rul w2 -> -1-w2
but
what when there is w1+w2+w3+... = -1
?



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