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MathGroup Archive 2012

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Finding the real part of a symbolic complex expression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126580] Finding the real part of a symbolic complex expression
  • From: Jacare Omoplata <walkeystalkey at gmail.com>
  • Date: Sun, 20 May 2012 02:35:52 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

I wanted to find the real part of (a + I b)(c + I d) , assuming a,b,c and d are real, "I" being Sqrt[-1].

So I tried,

Re[(a + I b) (c + I d)] /. Assuming -> Element[{a, b, c, d}, Reals]

Nothing happens. What I get for output is,

Re[(a+I b) (c+I d)]

I found out that I can use the function "ComplexExpand" to expand the expression assuming a,b,c and d to be real. But I'm curious to know if there a way to make Mathematica use "Re" to find the real part?



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