Re: Declaring real variables using Element
- To: mathgroup at smc.vnet.net
- Subject: [mg63464] Re: [mg63427] Declaring real variables using Element
- From: "David Park" <djmp at earthlink.net>
- Date: Sun, 1 Jan 2006 01:16:22 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Gideon, Simply use ComplexExpand, which assumes that all symbols are real. Conjugate[\[ImaginaryI] s] // ComplexExpand (-I)*s For some reason, beginners overlook the ComplexExpand command when starting to work with complex numbers and functions. You will almost always have to use ComplexExpand. Check it out in Help and also notice the Options. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: GidiL [mailto:gidienator at gmail.com] To: mathgroup at smc.vnet.net Hello to all! I am trying to declare the variable S to be real, using the Element command: Element[S, Reals] Next I calculate the complex conjugate of IS (I is the imaginary unit) Conjugate[\[ImaginaryI] S] The result I get is -\[ImaginaryI] Conjugate[S] which should have been -IS. Why does it not recognise S as a real variable? I would appreciate any help. Thanks, Gideon