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Re: Difficulties with Re

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98341] Re: Difficulties with Re
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Wed, 8 Apr 2009 02:46:01 -0400 (EDT)
  • References: <grcgjq$pmv$1@smc.vnet.net>

On Apr 6, 12:04 pm, Aaron Fude <aaronf... at gmail.com> wrote:
> Hi,
>
> 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]
>

Why don't you use ComplexExpand instead?

Also note that after applying ComplexExpand to your second expression,
the LeafCount *increases*, so it's no wonder Simplify doesn't do the
transformation.


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