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Re[a + I b] = a

• To: mathgroup@smc.vnet.net
• Subject: [mg10492] Re[a + I b] = a
• From: Markus.Hetzenecker@uibk.ac.at (Markus Hetzenecker)
• Date: Tue, 20 Jan 1998 02:22:43 -0500
• Organization: University of Innsbruck, Austria

hallo
how can I tell mathematica that the variable a and b is real, so that
Re[a+ I  b] results to a?
or: n a integer number and Sin[n x] results to 0?

I am using mathematica 2.2

thanxs, markus