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Re: Unprotect Plus, no automatic collection

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39115] Re: Unprotect Plus, no automatic collection
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 30 Jan 2003 01:05:51 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <b184d4$kqb$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

assign the right pattern ? Something like

Unprotect[Plus]; Plus[a_.*w1, a_.*w2] := -a

Regards
  Jens

Friedrich Laher wrote:
> 
> 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?


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