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MathGroup Archive 2005

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Re: Complex Variables

  • To: mathgroup at
  • Subject: [mg55431] Re: Complex Variables
  • From: "David Park" <djmp at>
  • Date: Wed, 23 Mar 2005 05:34:41 -0500 (EST)
  • Sender: owner-wri-mathgroup at


A practically indespensible command for complex variables is ComplexExpand.
It should perhaps have been called 'ComplexSimplify'. It tends to get
overlooked by users first trying out complex variables.

Re[x + I y] // ComplexExpand

Conjugate[x + I y] // ComplexExpand
x - I*y

Also, check out Help for ComplexExpand. You will sometimes have to use the
TargetFunctions option.

David Park
djmp at

From: wwolfe18 at [mailto:wwolfe18 at]
To: mathgroup at

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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