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Re: Trick for getting the comples conjugate in symbolic calculations?

• To: mathgroup at smc.vnet.net
• Subject: [mg30380] Re: Trick for getting the comples conjugate in symbolic calculations?
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Tue, 14 Aug 2001 03:45:31 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <9kqj1m$4bo$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

*if* you know that all your symbols are real than

expr /. Complex[a_,b_]:> Complex[a,-b]

will work.

Regards
  Jens

riefler at iwt.uni-bremen.de wrote:
> 
> Hi
> 
> I read in the older news that the numeric functions real / Re and imag
> / Im for  / Mathematica won't do its job because of some
> ambiguity. The same holds for the complex conjugate conj / Conjugate.
> 
> Is there a trick to get anyway the algebraic solution of for example
> (x1+i*y1)*conj(x2+i*y2) / (x1+i*y1)*Conjugate(x2+i*y2) in Mathematica?
> 
> Thanks a lot
> 
> Norbert