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Re: Complex Variables

  • To: mathgroup at
  • Subject: [mg55421] Re: Complex Variables
  • From: Torsten Coym <torsten.coym at>
  • Date: Wed, 23 Mar 2005 05:34:33 -0500 (EST)
  • Organization: Fraunhofer Gesellschaft (
  • References: <d1on33$nbs$>
  • Sender: owner-wri-mathgroup at

This does not declare the symbols to be real, but it solves the given 
example, since ComplexExpand[] assumes all variables in the expression 
to be real:

ComplexExpand[Conjugate[x+I y]]

x-\[ImaginaryI] y


wwolfe18 at wrote:
> This has been annoying me for a while.
> Is there a way to declare symbols to be real so that
> Re[x + i y]  gives x and Conjugate[x + i y] gives x - i y etc?
> Warren Wolfe

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