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Re: Difficulties with Re

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98337] Re: Difficulties with Re
  • From: Pillsy <pillsbury at gmail.com>
  • Date: Wed, 8 Apr 2009 02:45:18 -0400 (EDT)
  • References: <grcgjq$pmv$1@smc.vnet.net>

On Apr 6, 5:04 am, Aaron Fude <aaronf... at gmail.com> wrote:

> Of the following two expressions, the first "works", while the second
> doesn't. How does one make it work?

> Assuming[x > 0 && y > 0, Re[Exp[x + I y]] // Simplify]
> Assuming[x > 0 && y > 0, Re[Exp[(x + I y)^2]] // Simplify]

Try ComplexExpand[] instead of Simplify[]. You shouldn't even need to
use Assuming[], since ComplexExpand[] explicitly tells Mathematica to
assume all unspecified variables are real.

Cheers,
Pillsy


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