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Re: Re[a + I b] = a

• To: mathgroup@smc.vnet.net
• Subject: [mg10586] Re: Re[a + I b] = a
• From: hans.steffani@e-technik.tu-chemnitz.de (Hans Steffani)
• Date: Mon, 26 Jan 1998 04:42:20 -0500
• Organization: University of Technology Chemnitz, FRG
• References: <6a1j4c$pbp@smc.vnet.net>

Markus.Hetzenecker@uibk.ac.at (Markus Hetzenecker) writes:

>hallo
>how can I tell mathematica that the variable a and b is real, so that
>Re[a+ I  b] results to a?

This is only correct if a and b are real. Try Re[a + I b] //
ComplexExpand

Hans Friedrich Steffani
[CC,FUP]
--
Hans Friedrich Steffani
Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz
mailto:hans.steffani@e-technik.tu-chemnitz.de
http://www.tu-chemnitz.de/~hfst/