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Complex Numbers

• To: mathgroup at smc.vnet.net
• Subject: [mg47425] Complex Numbers
• From: Alejandro Vizcarra <gebankos at prodigy.net.mx>
• Date: Sun, 11 Apr 2004 04:44:03 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,:
 
I always have problems when dealing with complex numbers.  How can i
work with Mathematica in such a way that every expression will
be considered real unless it is declared explicitly complex (like a = 3 + 4 I ) ?
 
For example if I type 

Re[ComplexExpand[ Exp[a I] Exp[b I]]]

I get the answer

-Im[Sin[ a+b]]+Re[Cos[a+b]]

Instead of simply Cos[a+  b]

Thnx!

 
Alejandro Vizcarra

• Follow-Ups:
  • Re: Complex Numbers
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>