Derivative of the Real Part of a Complex Function (Mathematica)

  • Mathematica
  • Thread starter Swamp Thing
  • Start date
  • #1

Summary:

Why doesn't this work:
D [ Re[ Exp[u + 10*I] ], u ] /. u->0.5

Main Question or Discussion Point

When I type in this:
Code:
D [
      Re[
           Exp[u + 10*I]
        ],
           u
   ]    /.  u->0.5
I get this output:
1584851721030.png


Of course, I could just put the Re outside and the D inside, but it would be nice to know what is wrong with the above. What's with the Re' in the output?
 

Answers and Replies

  • #4
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Mathematica doesn’t know that you intend u to be real.
 
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