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Real and Imaginary Parts of complex functions

• To: mathgroup at smc.vnet.net
• Subject: [mg129920] Real and Imaginary Parts of complex functions
• From: Brentt <brenttnewman at gmail.com>
• Date: Tue, 26 Feb 2013 01:09:33 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net

Hello,

I was wondering why this works

IN[]:= Refine[Re[x + y I], Element[x , Reals] && Element[y , Reals]]

Out[]:= x

But this does not

In[]:= Refine[Re[1/(x + y I)], Element[x , Reals] && Element[y , Reals]]

Out[]:= Re[1/(x + y I)]



Is there a nice built in way to get the real and imaginary parts of a
complex function?

• Follow-Ups:
  • Re: Real and Imaginary Parts of complex functions
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Real and Imaginary Parts of complex functions
    • From: Sseziwa Mukasa <mukasa@gmail.com>
  • Re: Real and Imaginary Parts of complex functions
    • From: Bob Hanlon <hanlonr357@gmail.com>