Re: Finding the real part of a symbolic complex expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg126595] Re: Finding the real part of a symbolic complex expression*From*: Cisco Lane <travlorf at yahoo.com>*Date*: Tue, 22 May 2012 05:20:12 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

I think it needs to be simplified in order to get the assumptions to kick in. Also, Mathematica doesn't know to expand, so I would write: Assuming[Element[{a, b, c, d}, Reals],Simplify[Re[Expand[(a + I b) (c + I d)]]]]