RE: Complex Numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg47439] RE: [mg47425] Complex Numbers
- From: "David Park" <djmp at earthlink.net>
- Date: Mon, 12 Apr 2004 03:44:53 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Alejandro, Give ComplexExpand a chance to work on the entire expression. Re[Exp[a I] Exp[b I]] // ComplexExpand Cos[a + b] David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: Alejandro Vizcarra [mailto:gebankos at prodigy.net.mx] To: mathgroup at smc.vnet.net 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